enmi-conf.org: comparison wp/wp-includes/post.php

equal deleted inserted replaced

-:346c88efed21
+:5e2f62d02dcd
 		'query_var' => false,
 		'show_in_nav_menus' => false,
 		'delete_with_user' => true,
 		'supports' => array( 'title', 'author', 'comments' ),
 	) );
+	add_post_type_support( 'attachment:audio', 'thumbnail' );
+	add_post_type_support( 'attachment:video', 'thumbnail' );
 	register_post_type( 'revision', array(
 		'labels' => array(
 			'name' => __( 'Revisions' ),
 			'singular_name' => __( 'Revision' ),
 		'internal' => true,
 		'_builtin' => true, /* internal use only. */
 		'exclude_from_search' => false,
 	) );
 }
-add_action( 'init', 'create_initial_post_types', 0 ); // highest priority
 /**
 * Retrieve attached file path based on attachment ID.
 *
 * By default the path will go through the 'get_attached_file' filter, but
 * prevent looking up the meta name and provide a mechanism for sending the
 * attached filename through a filter.
 *
 * @since 2.0.0
 *
-* @param int $attachment_id Attachment ID.
+* @param int  $attachment_id Attachment ID.
-* @param bool $unfiltered Whether to apply filters.
+* @param bool $unfiltered    Optional. Whether to apply filters. Default false.
 * @return string|bool The file path to where the attached file should be, false otherwise.
 */
 function get_attached_file( $attachment_id, $unfiltered = false ) {
 	$file = get_post_meta( $attachment_id, '_wp_attached_file', true );
-	// If the file is relative, prepend upload dir
+	// If the file is relative, prepend upload dir.
 	if ( $file && 0 !== strpos($file, '/') && !preg_match('|^.:\\\|', $file) && ( ($uploads = wp_upload_dir()) && false === $uploads['error'] ) )
 		$file = $uploads['basedir'] . "/$file";
 	if ( $unfiltered )
 		return $file;
+	/**
+	 * Filter the attached file based on the given ID.
+	 *
+	 * @since 2.1.0
+	 *
+	 * @param string $file          Path to attached file.
+	 * @param int    $attachment_id Attachment ID.
+	 */
 	return apply_filters( 'get_attached_file', $file, $attachment_id );
 }
 /**
 * Update attachment file path based on attachment ID.
 *
 * Used to update the file path of the attachment, which uses post meta name
 * '_wp_attached_file' to store the path of the attachment.
 *
 * @since 2.1.0
-* @uses apply_filters() Calls 'update_attached_file' on file path and attachment ID.
+*
-*
+* @param int    $attachment_id Attachment ID.
-* @param int $attachment_id Attachment ID
+* @param string $file          File path for the attachment.
-* @param string $file File path for the attachment
 * @return bool True on success, false on failure.
 */
 function update_attached_file( $attachment_id, $file ) {
 	if ( !get_post( $attachment_id ) )
 		return false;
+	/**
+	 * Filter the path to the attached file to update.
+	 *
+	 * @since 2.1.0
+	 *
+	 * @param string $file          Path to the attached file to update.
+	 * @param int    $attachment_id Attachment ID.
+	 */
 	$file = apply_filters( 'update_attached_file', $file, $attachment_id );
 	if ( $file = _wp_relative_upload_path( $file ) )
 		return update_post_meta( $attachment_id, '_wp_attached_file', $file );
 	else
 		return delete_post_meta( $attachment_id, '_wp_attached_file' );
 }
 * Return relative path to an uploaded file.
 *
 * The path is relative to the current upload dir.
 *
 * @since 2.9.0
-* @uses apply_filters() Calls '_wp_relative_upload_path' on file path.
+*
-*
+* @param string $path Full path to the file.
-* @param string $path Full path to the file
+* @return string Relative path on success, unchanged path on failure.
-* @return string relative path on success, unchanged path on failure.
 */
 function _wp_relative_upload_path( $path ) {
 	$new_path = $path;
 	$uploads = wp_upload_dir();
 	if ( 0 === strpos( $new_path, $uploads['basedir'] ) ) {
 			$new_path = str_replace( $uploads['basedir'], '', $new_path );
 			$new_path = ltrim( $new_path, '/' );
 	}
+	/**
+	 * Filter the relative path to an uploaded file.
+	 *
+	 * @since 2.9.0
+	 *
+	 * @param string $new_path Relative path to the file.
+	 * @param string $path     Full path to the file.
+	 */
 	return apply_filters( '_wp_relative_upload_path', $new_path, $path );
 }
 /**
 * Retrieve all children of the post parent ID.
 * The 'post_type' and 'post_status' arguments can be used to choose what
 * criteria of posts to retrieve. The 'post_type' can be anything, but WordPress
 * post types are 'post', 'pages', and 'attachments'. The 'post_status'
 * argument will accept any post status within the write administration panels.
 *
-* @see get_posts() Has additional arguments that can be replaced.
-* @internal Claims made in the long description might be inaccurate.
-*
 * @since 2.0.0
 *
-* @param mixed $args Optional. User defined arguments for replacing the defaults.
+* @see get_posts()
-* @param string $output Optional. Constant for return type, either OBJECT (default), ARRAY_A, ARRAY_N.
+* @todo Check validity of description.
-* @return array|bool False on failure and the type will be determined by $output parameter.
+*
-*/
+* @param mixed  $args   Optional. User defined arguments for replacing the defaults. Default empty.
-function get_children($args = '', $output = OBJECT) {
+* @param string $output Optional. Constant for return type. Accepts OBJECT, ARRAY_A, ARRAY_N.
+*                       Default OBJECt.
+* @return array Array of children, where the type of each element is determined by $output parameter.
+*               Empty array on failure.
+*/
+function get_children( $args = '', $output = OBJECT ) {
 	$kids = array();
 	if ( empty( $args ) ) {
 		if ( isset( $GLOBALS['post'] ) ) {
 			$args = array('post_parent' => (int) $GLOBALS['post']->post_parent );
 		} else {
 		$kids[$child->ID] = $children[$key];
 	if ( $output == OBJECT ) {
 		return $kids;
 	} elseif ( $output == ARRAY_A ) {
-		foreach ( (array) $kids as $kid )
+		$weeuns = array();
+		foreach ( (array) $kids as $kid ) {
 			$weeuns[$kid->ID] = get_object_vars($kids[$kid->ID]);
+		}
 		return $weeuns;
 	} elseif ( $output == ARRAY_N ) {
-		foreach ( (array) $kids as $kid )
+		$babes = array();
+		foreach ( (array) $kids as $kid ) {
 			$babes[$kid->ID] = array_values(get_object_vars($kids[$kid->ID]));
+		}
 		return $babes;
 	} else {
 		return $kids;
 	}
 }
 * There should not be any space after the second dash and before the word
 * 'more'. There can be text or space(s) after the word 'more', but won't be
 * referenced.
 *
 * The returned array has 'main', 'extended', and 'more_text' keys. Main has the text before
-* the <code><!--more--></code>. The 'extended' key has the content after the
+* the `<!--more-->`. The 'extended' key has the content after the
-* <code><!--more--></code> comment. The 'more_text' key has the custom "Read More" text.
+* `<!--more-->` comment. The 'more_text' key has the custom "Read More" text.
 *
 * @since 1.0.0
 *
 * @param string $post Post content.
 * @return array Post before ('main'), after ('extended'), and custom readmore ('more_text').
 */
-function get_extended($post) {
+function get_extended( $post ) {
-	//Match the new style more links
+	//Match the new style more links.
 	if ( preg_match('/<!--more(.*?)?-->/', $post, $matches) ) {
 		list($main, $extended) = explode($matches[0], $post, 2);
 		$more_text = $matches[1];
 	} else {
 		$main = $post;
 		$extended = '';
 		$more_text = '';
 	}
-	// ` leading and trailing whitespace
+	//  leading and trailing whitespace.
 	$main = preg_replace('/^[\s]*(.*)[\s]*$/', '\\1', $main);
 	$extended = preg_replace('/^[\s]*(.*)[\s]*$/', '\\1', $extended);
 	$more_text = preg_replace('/^[\s]*(.*)[\s]*$/', '\\1', $more_text);
 	return array( 'main' => $main, 'extended' => $extended, 'more_text' => $more_text );
 *
 * See {@link sanitize_post()} for optional $filter values. Also, the parameter
 * $post, must be given as a variable, since it is passed by reference.
 *
 * @since 1.5.1
-* @link http://codex.wordpress.org/Function_Reference/get_post
+*
-*
+* @param int|WP_Post $post   Optional. Post ID or post object. Defaults to global $post.
-* @param int|object $post Post ID or post object. Optional, default is the current post from the loop.
+* @param string      $output Optional, default is Object. Accepts OBJECT, ARRAY_A, or ARRAY_N.
-* @param string $output Optional, default is Object. Either OBJECT, ARRAY_A, or ARRAY_N.
+*                            Default OBJECT.
-* @param string $filter Optional, default is raw.
+* @param string      $filter Optional. Type of filter to apply. Accepts 'raw', 'edit', 'db',
-* @return WP_Post|null WP_Post on success or null on failure
+*                            or 'display'. Default 'raw'.
+* @return WP_Post|array|null Type corresponding to $output on success or null on failure.
+*                            When $output is OBJECT, a `WP_Post` instance is returned.
 */
 function get_post( $post = null, $output = OBJECT, $filter = 'raw' ) {
 	if ( empty( $post ) && isset( $GLOBALS['post'] ) )
 		$post = $GLOBALS['post'];
-	if ( is_a( $post, 'WP_Post' ) ) {
+	if ( $post instanceof WP_Post ) {
 		$_post = $post;
 	} elseif ( is_object( $post ) ) {
 		if ( empty( $post->filter ) ) {
 			$_post = sanitize_post( $post, 'raw' );
 			$_post = new WP_Post( $_post );
 /**
 * WordPress Post class.
 *
 * @since 3.5.0
 *
+* @property-read array  $ancestors
+* @property-read string $page_template
+* @property-read int    $post_category
+* @property-read string $tag_input
+*
 */
 final class WP_Post {
 	/**
 	 * Post ID.
 	 *
 	 * @var string
 	 */
 	public $filter;
+	/**
+	 * Retrieve WP_Post instance.
+	 *
+	 * @static
+	 * @access public
+	 *
+	 * @param int $post_id Post ID.
+	 * @return WP_Post|bool Post object, false otherwise.
+	 */
 	public static function get_instance( $post_id ) {
 		global $wpdb;
 		$post_id = (int) $post_id;
 		if ( ! $post_id )
 		}
 		return new WP_Post( $_post );
 	}
+	/**
+	 * Constructor.
+	 *
+	 * @param WP_Post $post Post object.
+	 */
 	public function __construct( $post ) {
 		foreach ( get_object_vars( $post ) as $key => $value )
 			$this->$key = $value;
 	}
+	/**
+	 * Isset-er.
+	 *
+	 * @param string $key Property to check if set.
+	 * @return bool
+	 */
 	public function __isset( $key ) {
 		if ( 'ancestors' == $key )
 			return true;
 		if ( 'page_template' == $key )
 		   return true;
 		return metadata_exists( 'post', $this->ID, $key );
 	}
+	/**
+	 * Getter.
+	 *
+	 * @param string $key Key to get.
+	 * @return array|mixed
+	 */
 	public function __get( $key ) {
 		if ( 'page_template' == $key && $this->__isset( $key ) ) {
 			return get_post_meta( $this->ID, '_wp_page_template', true );
 		}
 				return array();
 			return wp_list_pluck( $terms, 'name' );
 		}
-		// Rest of the values need filtering
+		// Rest of the values need filtering.
 		if ( 'ancestors' == $key )
 			$value = get_post_ancestors( $this );
 		else
 			$value = get_post_meta( $this->ID, $key, true );
 			$value = sanitize_post_field( $key, $value, $this->ID, $this->filter );
 		return $value;
 	}
+	/**
+	 * {@Missing Summary}
+	 *
+	 * @param string $filter Filter.
+	 * @return $this|array|bool|object|WP_Post
+	 */
 	public function filter( $filter ) {
 		if ( $this->filter == $filter )
 			return $this;
 		if ( $filter == 'raw' )
 			return self::get_instance( $this->ID );
 		return sanitize_post( $this, $filter );
 	}
+	/**
+	 * Convert object to array.
+	 *
+	 * @return array Object as array.
+	 */
 	public function to_array() {
 		$post = get_object_vars( $this );
 		foreach ( array( 'ancestors', 'page_template', 'post_category', 'tags_input' ) as $key ) {
 			if ( $this->__isset( $key ) )
 /**
 * Retrieve ancestors of a post.
 *
 * @since 2.5.0
 *
-* @param int|object $post Post ID or post object
+* @param int|WP_Post $post Post ID or post object.
 * @return array Ancestor IDs or empty array if none are found.
 */
 function get_post_ancestors( $post ) {
 	$post = get_post( $post );
 *
 * The context values are based off of the taxonomy filter functions and
 * supported values are found within those functions.
 *
 * @since 2.3.0
-* @uses sanitize_post_field() See for possible $context values.
+*
-*
+* @see sanitize_post_field()
-* @param string $field Post field name.
+*
-* @param int|object $post Post ID or post object.
+* @param string      $field   Post field name.
-* @param string $context Optional. How to filter the field. Default is 'display'.
+* @param int|WP_Post $post    Post ID or post object.
+* @param string      $context Optional. How to filter the field. Accepts 'raw', 'edit', 'db',
+*                             or 'display'. Default 'display'.
 * @return string The value of the post field on success, empty string on failure.
 */
 function get_post_field( $field, $post, $context = 'display' ) {
 	$post = get_post( $post );
 * This function can be used with any post type, but it makes more sense with
 * attachments.
 *
 * @since 2.0.0
 *
-* @param int $ID Optional. Post ID. Default is the current post from the loop.
+* @param int|WP_Post $ID Optional. Post ID or post object. Default empty.
-* @return string|bool The mime type on success, false on failure.
+* @return string|false The mime type on success, false on failure.
 */
-function get_post_mime_type($ID = '') {
+function get_post_mime_type( $ID = '' ) {
 	$post = get_post($ID);
 	if ( is_object($post) )
 		return $post->post_mime_type;
 * If the post ID is of an attachment, then the parent post status will be given
 * instead.
 *
 * @since 2.0.0
 *
-* @param int $ID Optional. Post ID. Default is the current post from the loop.
+* @param int|WP_Post $ID Optional. Post ID or post object. Default empty.
-* @return string|bool Post status on success, false on failure.
+* @return string|false Post status on success, false on failure.
 */
-function get_post_status($ID = '') {
+function get_post_status( $ID = '' ) {
 	$post = get_post($ID);
 	if ( !is_object($post) )
 		return false;
 	if ( 'attachment' == $post->post_type ) {
 		if ( 'private' == $post->post_status )
 			return 'private';
-		// Unattached attachments are assumed to be published
+		// Unattached attachments are assumed to be published.
 		if ( ( 'inherit' == $post->post_status ) && ( 0 == $post->post_parent) )
 			return 'publish';
-		// Inherit status from the parent
+		// Inherit status from the parent.
-		if ( $post->post_parent && ( $post->ID != $post->post_parent ) )
+		if ( $post->post_parent && ( $post->ID != $post->post_parent ) ) {
-			return get_post_status($post->post_parent);
+			$parent_post_status = get_post_status( $post->post_parent );
+			if ( 'trash' == $parent_post_status ) {
+				return get_post_meta( $post->post_parent, '_wp_trash_meta_status', true );
+			} else {
+				return $parent_post_status;
+			}
+		}
 	}
 	return $post->post_status;
 }
 *
 * @return array List of post statuses.
 */
 function get_post_statuses() {
 	$status = array(
-		'draft'			=> __('Draft'),
+		'draft'   => __( 'Draft' ),
-		'pending'		=> __('Pending Review'),
+		'pending' => __( 'Pending Review' ),
-		'private'		=> __('Private'),
+		'private' => __( 'Private' ),
-		'publish'		=> __('Published')
+		'publish' => __( 'Published' )
 	);
 	return $status;
 }
 *
 * @return array List of page statuses.
 */
 function get_page_statuses() {
 	$status = array(
-		'draft'			=> __('Draft'),
+		'draft'   => __( 'Draft' ),
-		'private'		=> __('Private'),
+		'private' => __( 'Private' ),
-		'publish'		=> __('Published')
+		'publish' => __( 'Published' )
 	);
 	return $status;
 }
 *
 * A simple function for creating or modifying a post status based on the
 * parameters given. The function will accept an array (second optional
 * parameter), along with a string for the post status name.
 *
-*
-* Optional $args contents:
-*
-* label - A descriptive name for the post status marked for translation. Defaults to $post_status.
-* public - Whether posts of this status should be shown in the front end of the site. Defaults to true.
-* exclude_from_search - Whether to exclude posts with this post status from search results. Defaults to false.
-* show_in_admin_all_list - Whether to include posts in the edit listing for their post type
-* show_in_admin_status_list - Show in the list of statuses with post counts at the top of the edit
-*                             listings, e.g. All (12) | Published (9) | My Custom Status (2) ...
-*
 * Arguments prefixed with an _underscore shouldn't be used by plugins and themes.
 *
-* @package WordPress
-* @subpackage Post
 * @since 3.0.0
 * @uses $wp_post_statuses Inserts new post status object into the list
 *
 * @param string $post_status Name of the post status.
-* @param array|string $args See above description.
+* @param array|string $args {
-*/
+*     Optional. Array or string of post status arguments.
-function register_post_status($post_status, $args = array()) {
+*
+*     @type bool|string $label                     A descriptive name for the post status marked
+*                                                  for translation. Defaults to value of $post_status.
+*     @type bool|array  $label_count               Descriptive text to use for nooped plurals.
+*                                                  Default array of $label, twice
+*     @type bool        $exclude_from_search       Whether to exclude posts with this post status
+*                                                  from search results. Default is value of $internal.
+*     @type bool        $_builtin                  Whether the status is built-in. Core-use only.
+*                                                  Default false.
+*     @type bool        $public                    Whether posts of this status should be shown
+*                                                  in the front end of the site. Default true.
+*     @type bool        $internal                  Whether the status is for internal use only.
+*                                                  Default false.
+*     @type bool        $protected                 Whether posts with this status should be protected.
+*                                                  Default false.
+*     @type bool        $private                   Whether posts with this status should be private.
+*                                                  Default false.
+*     @type bool        $publicly_queryable        Whether posts with this status should be publicly-
+*                                                  queryable. Default is value of $public.
+*     @type bool        $show_in_admin_all_list    Whether to include posts in the edit listing for
+*                                                  their post type. Default is value of $internal.
+*     @type bool        $show_in_admin_status_list Show in the list of statuses with post counts at
+*                                                  the top of the edit listings,
+*                                                  e.g. All (12) | Published (9) | My Custom Status (2)
+*                                                  Default is value of $internal.
+* }
+*/
+function register_post_status( $post_status, $args = array() ) {
 	global $wp_post_statuses;
 	if (!is_array($wp_post_statuses))
 		$wp_post_statuses = array();
 	$args = (object) $args;
 	$post_status = sanitize_key($post_status);
 	$args->name = $post_status;
+	// Set various defaults.
 	if ( null === $args->public && null === $args->internal && null === $args->protected && null === $args->private )
 		$args->internal = true;
 	if ( null === $args->public  )
 		$args->public = false;
 	return $args;
 }
 /**
-* Retrieve a post status object by name
+* Retrieve a post status object by name.
 *
-* @package WordPress
-* @subpackage Post
 * @since 3.0.0
-* @uses $wp_post_statuses
+*
-* @see register_post_status
+* @global array $wp_post_statuses List of post statuses.
-* @see get_post_statuses
+*
-*
+* @see register_post_status()
-* @param string $post_status The name of a registered post status
+*
-* @return object A post status object
+* @param string $post_status The name of a registered post status.
+* @return object A post status object.
 */
 function get_post_status_object( $post_status ) {
 	global $wp_post_statuses;
 	if ( empty($wp_post_statuses[$post_status]) )
 	return $wp_post_statuses[$post_status];
 }
 /**
-* Get a list of all registered post status objects.
+* Get a list of post statuses.
 *
-* @package WordPress
-* @subpackage Post
 * @since 3.0.0
-* @uses $wp_post_statuses
+*
-* @see register_post_status
+* @global array $wp_post_statuses List of post statuses.
-* @see get_post_status_object
+*
-*
+* @see register_post_status()
-* @param array|string $args An array of key => value arguments to match against the post status objects.
+*
-* @param string $output The type of output to return, either post status 'names' or 'objects'. 'names' is the default.
+* @param array|string $args     Optional. Array or string of post status arguments to compare against
-* @param string $operator The logical operation to perform. 'or' means only one element
+*                               properties of the global `$wp_post_statuses objects`. Default empty array.
-*  from the array needs to match; 'and' means all elements must match. The default is 'and'.
+* @param string       $output   Optional. The type of output to return, either 'names' or 'objects'. Default 'names'.
-* @return array A list of post status names or objects
+* @param string       $operator Optional. The logical operation to perform. 'or' means only one element
+*                               from the array needs to match; 'and' means all elements must match.
+*                               Default 'and'.
+* @return array A list of post status names or objects.
 */
 function get_post_stati( $args = array(), $output = 'names', $operator = 'and' ) {
 	global $wp_post_statuses;
 	$field = ('names' == $output) ? 'name' : false;
 * Whether the post type is hierarchical.
 *
 * A false return value might also mean that the post type does not exist.
 *
 * @since 3.0.0
-* @see get_post_type_object
+*
+* @see get_post_type_object()
 *
 * @param string $post_type Post type name
 * @return bool Whether post type is hierarchical.
 */
 function is_post_type_hierarchical( $post_type ) {
 	$post_type = get_post_type_object( $post_type );
 	return $post_type->hierarchical;
 }
 /**
-* Checks if a post type is registered.
+* Check if a post type is registered.
 *
 * @since 3.0.0
-* @uses get_post_type_object()
+*
-*
+* @see get_post_type_object()
-* @param string $post_type Post type name
+*
+* @param string $post_type Post type name.
 * @return bool Whether post type is registered.
 */
 function post_type_exists( $post_type ) {
 	return (bool) get_post_type_object( $post_type );
 }
 /**
 * Retrieve the post type of the current post or of a given post.
 *
 * @since 2.1.0
 *
-* @param int|object $post Optional. Post ID or post object. Default is the current post from the loop.
+* @param int|WP_Post $post Optional. Post ID or post object. Default is global $post.
-* @return string|bool Post type on success, false on failure.
+* @return string|false Post type on success, false on failure.
 */
 function get_post_type( $post = null ) {
 	if ( $post = get_post( $post ) )
 		return $post->post_type;
 	return false;
 }
 /**
-* Retrieve a post type object by name
+* Retrieve a post type object by name.
 *
-* @package WordPress
-* @subpackage Post
 * @since 3.0.0
-* @uses $wp_post_types
+*
-* @see register_post_type
+* @global array $wp_post_types List of post types.
-* @see get_post_types
+*
-*
+* @see register_post_type()
-* @param string $post_type The name of a registered post type
+*
-* @return object A post type object
+* @param string $post_type The name of a registered post type.
+* @return object A post type object.
 */
 function get_post_type_object( $post_type ) {
 	global $wp_post_types;
 	if ( empty($wp_post_types[$post_type]) )
 }
 /**
 * Get a list of all registered post type objects.
 *
-* @package WordPress
-* @subpackage Post
 * @since 2.9.0
-* @uses $wp_post_types
+*
-* @see register_post_type
+* @global array $wp_post_types List of post types.
 *
-* @param array|string $args An array of key => value arguments to match against the post type objects.
+* @see register_post_type() for accepted arguments.
-* @param string $output The type of output to return, either post type 'names' or 'objects'. 'names' is the default.
+*
-* @param string $operator The logical operation to perform. 'or' means only one element
+* @param array|string $args     Optional. An array of key => value arguments to match against
-*  from the array needs to match; 'and' means all elements must match. The default is 'and'.
+*                               the post type objects. Default empty array.
-* @return array A list of post type names or objects
+* @param string       $output   Optional. The type of output to return. Accepts post type 'names'
+*                               or 'objects'. Default 'names'.
+* @param string       $operator Optional. The logical operation to perform. 'or' means only one
+*                               element from the array needs to match; 'and' means all elements
+*                               must match. Accepts 'or' or 'and'. Default 'and'.
+* @return array A list of post type names or objects.
 */
 function get_post_types( $args = array(), $output = 'names', $operator = 'and' ) {
 	global $wp_post_types;
 	$field = ('names' == $output) ? 'name' : false;
 *
 * A function for creating or modifying a post type based on the
 * parameters given. The function will accept an array (second optional
 * parameter), along with a string for the post type name.
 *
-* Optional $args contents:
-*
-* - label - Name of the post type shown in the menu. Usually plural. If not set, labels['name'] will be used.
-* - labels - An array of labels for this post type.
-*     * If not set, post labels are inherited for non-hierarchical types and page labels for hierarchical ones.
-*     * You can see accepted values in {@link get_post_type_labels()}.
-* - description - A short descriptive summary of what the post type is. Defaults to blank.
-* - public - Whether a post type is intended for use publicly either via the admin interface or by front-end users.
-*     * Defaults to false.
-*     * While the default settings of exclude_from_search, publicly_queryable, show_ui, and show_in_nav_menus are
-*       inherited from public, each does not rely on this relationship and controls a very specific intention.
-* - hierarchical - Whether the post type is hierarchical (e.g. page). Defaults to false.
-* - exclude_from_search - Whether to exclude posts with this post type from front end search results.
-*     * If not set, the opposite of public's current value is used.
-* - publicly_queryable - Whether queries can be performed on the front end for the post type as part of parse_request().
-*     * ?post_type={post_type_key}
-*     * ?{post_type_key}={single_post_slug}
-*     * ?{post_type_query_var}={single_post_slug}
-*     * If not set, the default is inherited from public.
-* - show_ui - Whether to generate a default UI for managing this post type in the admin.
-*     * If not set, the default is inherited from public.
-* - show_in_menu - Where to show the post type in the admin menu.
-*     * If true, the post type is shown in its own top level menu.
-*     * If false, no menu is shown
-*     * If a string of an existing top level menu (eg. 'tools.php' or 'edit.php?post_type=page'), the post type will
-*       be placed as a sub menu of that.
-*     * show_ui must be true.
-*     * If not set, the default is inherited from show_ui
-* - show_in_nav_menus - Makes this post type available for selection in navigation menus.
-*     * If not set, the default is inherited from public.
-* - show_in_admin_bar - Makes this post type available via the admin bar.
-*     * If not set, the default is inherited from show_in_menu
-* - menu_position - The position in the menu order the post type should appear.
-*     * show_in_menu must be true
-*     * Defaults to null, which places it at the bottom of its area.
-* - menu_icon - The url to the icon to be used for this menu. Defaults to use the posts icon.
-* - capability_type - The string to use to build the read, edit, and delete capabilities. Defaults to 'post'.
-*     * May be passed as an array to allow for alternative plurals when using this argument as a base to construct the
-*       capabilities, e.g. array('story', 'stories').
-* - capabilities - Array of capabilities for this post type.
-*     * By default the capability_type is used as a base to construct capabilities.
-*     * You can see accepted values in {@link get_post_type_capabilities()}.
-* - map_meta_cap - Whether to use the internal default meta capability handling. Defaults to false.
-* - supports - An alias for calling add_post_type_support() directly. Defaults to title and editor.
-*     * See {@link add_post_type_support()} for documentation.
-* - register_meta_box_cb - Provide a callback function that sets up the meta boxes
-*     for the edit form. Do remove_meta_box() and add_meta_box() calls in the callback.
-* - taxonomies - An array of taxonomy identifiers that will be registered for the post type.
-*     * Default is no taxonomies.
-*     * Taxonomies can be registered later with register_taxonomy() or register_taxonomy_for_object_type().
-* - has_archive - True to enable post type archives. Default is false.
-*     * Will generate the proper rewrite rules if rewrite is enabled.
-* - rewrite - Triggers the handling of rewrites for this post type. Defaults to true, using $post_type as slug.
-*     * To prevent rewrite, set to false.
-*     * To specify rewrite rules, an array can be passed with any of these keys
-*         * 'slug' => string Customize the permastruct slug. Defaults to $post_type key
-*         * 'with_front' => bool Should the permastruct be prepended with WP_Rewrite::$front. Defaults to true.
-*         * 'feeds' => bool Should a feed permastruct be built for this post type. Inherits default from has_archive.
-*         * 'pages' => bool Should the permastruct provide for pagination. Defaults to true.
-*         * 'ep_mask' => const Assign an endpoint mask.
-*             * If not specified and permalink_epmask is set, inherits from permalink_epmask.
-*             * If not specified and permalink_epmask is not set, defaults to EP_PERMALINK
-* - query_var - Sets the query_var key for this post type. Defaults to $post_type key
-*     * If false, a post type cannot be loaded at ?{query_var}={post_slug}
-*     * If specified as a string, the query ?{query_var_string}={post_slug} will be valid.
-* - can_export - Allows this post type to be exported. Defaults to true.
-* - delete_with_user - Whether to delete posts of this type when deleting a user.
-*     * If true, posts of this type belonging to the user will be moved to trash when then user is deleted.
-*     * If false, posts of this type belonging to the user will *not* be trashed or deleted.
-*     * If not set (the default), posts are trashed if post_type_supports('author'). Otherwise posts are not trashed or deleted.
-* - _builtin - true if this post type is a native or "built-in" post_type. THIS IS FOR INTERNAL USE ONLY!
-* - _edit_link - URL segement to use for edit link of this post type. THIS IS FOR INTERNAL USE ONLY!
-*
 * @since 2.9.0
-* @uses $wp_post_types Inserts new post type object into the list
+*
-* @uses $wp_rewrite Gets default feeds
+* @global array      $wp_post_types List of post types.
-* @uses $wp Adds query vars
+* @global WP_Rewrite $wp_rewrite    Used for default feeds.
+* @global WP         $wp            Used to add query vars.
 *
 * @param string $post_type Post type key, must not exceed 20 characters.
-* @param array|string $args See optional args description above.
+* @param array|string $args {
-* @return object|WP_Error the registered post type object, or an error object.
+*     Array or string of arguments for registering a post type.
+*
+*     @type string      $label                Name of the post type shown in the menu. Usually plural.
+*                                             Default is value of $labels['name'].
+*     @type array       $labels               An array of labels for this post type. If not set, post
+*                                             labels are inherited for non-hierarchical types and page
+*                                             labels for hierarchical ones. {@see get_post_type_labels()}.
+*     @type string      $description          A short descriptive summary of what the post type is.
+*                                             Default empty.
+*     @type bool        $public               Whether a post type is intended for use publicly either via
+*                                             the admin interface or by front-end users. While the default
+*                                             settings of $exclude_from_search, $publicly_queryable, $show_ui,
+*                                             and $show_in_nav_menus are inherited from public, each does not
+*                                             rely on this relationship and controls a very specific intention.
+*                                             Default false.
+*     @type bool        $hierarchical         Whether the post type is hierarchical (e.g. page). Default false.
+*     @type bool        $exclude_from_search  Whether to exclude posts with this post type from front end search
+*                                             results. Default is the opposite value of $public.
+*     @type bool        $publicly_queryable   Whether queries can be performed on the front end for the post type
+*                                             as part of {@see parse_request()}. Endpoints would include:
+*                                             * ?post_type={post_type_key}
+*                                             * ?{post_type_key}={single_post_slug}
+*                                             * ?{post_type_query_var}={single_post_slug}
+*                                             If not set, the default is inherited from $public.
+*     @type bool        $show_ui              Whether to generate a default UI for managing this post type in the
+*                                             admin. Default is value of $public.
+*     @type bool        $show_in_menu         Where to show the post type in the admin menu. To work, $show_ui
+*                                             must be true. If true, the post type is shown in its own top level
+*                                             menu. If false, no menu is shown. If a string of an existing top
+*                                             level menu (eg. 'tools.php' or 'edit.php?post_type=page'), the post
+*                                             type will be placed as a sub-menu of that.
+*                                             Default is value of $show_ui.
+*     @type bool        $show_in_nav_menus    Makes this post type available for selection in navigation menus.
+*                                             Default is value $public.
+*     @type bool        $show_in_admin_bar    Makes this post type available via the admin bar. Default is value
+*                                             of $show_in_menu.
+*     @type int         $menu_position        The position in the menu order the post type should appear. To work,
+*                                             $show_in_menu must be true. Default null (at the bottom).
+*     @type string      $menu_icon            The url to the icon to be used for this menu. Pass a base64-encoded
+*                                             SVG using a data URI, which will be colored to match the color scheme
+*                                             -- this should begin with 'data:image/svg+xml;base64,'. Pass the name
+*                                             of a Dashicons helper class to use a font icon, e.g.
+*                                             'dashicons-chart-pie'. Pass 'none' to leave div.wp-menu-image empty
+*                                             so an icon can be added via CSS. Defaults to use the posts icon.
+*     @type string      $capability_type      The string to use to build the read, edit, and delete capabilities.
+*                                             May be passed as an array to allow for alternative plurals when using
+*                                             this argument as a base to construct the capabilities, e.g.
+*                                             array('story', 'stories'). Default 'post'.
+*     @type array       $capabilities         Array of capabilities for this post type. $capability_type is used
+*                                             as a base to construct capabilities by default.
+*                                             {@see get_post_type_capabilities()}.
+*     @type bool        $map_meta_cap         Whether to use the internal default meta capability handling.
+*                                             Default false.
+*     @type array       $supports             An alias for calling {@see add_post_type_support()} directly.
+*                                             Defaults to array containing 'title' & 'editor'.
+*     @type callback    $register_meta_box_cb Provide a callback function that sets up the meta boxes for the
+*                                             edit form. Do remove_meta_box() and add_meta_box() calls in the
+*                                             callback. Default null.
+*     @type array       $taxonomies           An array of taxonomy identifiers that will be registered for the
+*                                             post type. Taxonomies can be registered later with
+*                                             {@see register_taxonomy()} or {@see register_taxonomy_for_object_type()}.
+*                                             Default empty array.
+*     @type bool|string $has_archive          Whether there should be post type archives, or if a string, the
+*                                             archive slug to use. Will generate the proper rewrite rules if
+*                                             $rewrite is enabled. Default false.
+*     @type bool|array  $rewrite              {
+*         Triggers the handling of rewrites for this post type. To prevent rewrite, set to false.
+*         Defaults to true, using $post_type as slug. To specify rewrite rules, an array can be
+*         passed with any of these keys:
+*
+*         @type string $slug       Customize the permastruct slug. Defaults to $post_type key.
+*         @type bool   $with_front Whether the permastruct should be prepended with WP_Rewrite::$front.
+*                                  Default true.
+*         @type bool   $feeds      Whether the feed permastruct should be built for this post type.
+*                                  Default is value of $has_archive.
+*         @type bool   $pages      Whether the permastruct should provide for pagination. Default true.
+*         @type const  $ep_mask    Endpoint mask to assign. If not specified and permalink_epmask is set,
+*                                  inherits from $permalink_epmask. If not specified and permalink_epmask
+*                                  is not set, defaults to EP_PERMALINK.
+*     }
+*     @type string|bool $query_var            Sets the query_var key for this post type. Defaults to $post_type
+*                                             key. If false, a post type cannot be loaded at
+*                                             ?{query_var}={post_slug}. If specified as a string, the query
+*                                             ?{query_var_string}={post_slug} will be valid.
+*     @type bool        $can_export           Whether to allow this post type to be exported. Default true.
+*     @type bool        $delete_with_user     Whether to delete posts of this type when deleting a user. If true,
+*                                             posts of this type belonging to the user will be moved to trash
+*                                             when then user is deleted. If false, posts of this type belonging
+*                                             to the user will *not* be trashed or deleted. If not set (the default),
+*                                             posts are trashed if post_type_supports('author'). Otherwise posts
+*                                             are not trashed or deleted. Default null.
+*     @type bool        $_builtin             FOR INTERNAL USE ONLY! True if this post type is a native or
+*                                             "built-in" post_type. Default false.
+*     @type string      $_edit_link           FOR INTERNAL USE ONLY! URL segment to use for edit link of
+*                                             this post type. Default 'post.php?post=%d'.
+* }
+* @return object|WP_Error The registered post type object, or an error object.
 */
 function register_post_type( $post_type, $args = array() ) {
 	global $wp_post_types, $wp_rewrite, $wp;
 	if ( ! is_array( $wp_post_types ) )
 	$args = (object) $args;
 	$post_type = sanitize_key( $post_type );
 	$args->name = $post_type;
-	if ( strlen( $post_type ) > 20 )
+	if ( empty( $post_type ) || strlen( $post_type ) > 20 ) {
-		return new WP_Error( 'post_type_too_long', __( 'Post types cannot exceed 20 characters in length' ) );
+		_doing_it_wrong( __FUNCTION__, __( 'Post type names must be between 1 and 20 characters in length.' ), '4.2' );
+		return new WP_Error( 'post_type_length_invalid', __( 'Post type names must be between 1 and 20 characters in length.' ) );
+	}
 	// If not set, default to the setting for public.
 	if ( null === $args->publicly_queryable )
 		$args->publicly_queryable = $args->public;
 	if ( null === $args->show_in_menu || ! $args->show_ui )
 		$args->show_in_menu = $args->show_ui;
 	// If not set, default to the whether the full UI is shown.
 	if ( null === $args->show_in_admin_bar )
-		$args->show_in_admin_bar = true === $args->show_in_menu;
+		$args->show_in_admin_bar = (bool) $args->show_in_menu;
 	// If not set, default to the setting for public.
 	if ( null === $args->show_in_nav_menus )
 		$args->show_in_nav_menus = $args->public;
 	// If not set, default to true if not public, false if public.
 	if ( null === $args->exclude_from_search )
 		$args->exclude_from_search = !$args->public;
-	// Back compat with quirky handling in version 3.0. #14122
+	// Back compat with quirky handling in version 3.0. #14122.
 	if ( empty( $args->capabilities ) && null === $args->map_meta_cap && in_array( $args->capability_type, array( 'post', 'page' ) ) )
 		$args->map_meta_cap = true;
 	// If not set, default to false.
 	if ( null === $args->map_meta_cap )
 		$permastruct_args = $args->rewrite;
 		$permastruct_args['feed'] = $permastruct_args['feeds'];
 		add_permastruct( $post_type, "{$args->rewrite['slug']}/%$post_type%", $permastruct_args );
 	}
+	// Register the post type meta box if a custom callback was specified.
 	if ( $args->register_meta_box_cb )
 		add_action( 'add_meta_boxes_' . $post_type, $args->register_meta_box_cb, 10, 1 );
 	$args->labels = get_post_type_labels( $args );
 	$args->label = $args->labels->name;
 	foreach ( $args->taxonomies as $taxonomy ) {
 		register_taxonomy_for_object_type( $taxonomy, $post_type );
 	}
+	/**
+	 * Fires after a post type is registered.
+	 *
+	 * @since 3.3.0
+	 *
+	 * @param string $post_type Post type.
+	 * @param object $args      Arguments used to register the post type.
+	 */
 	do_action( 'registered_post_type', $post_type, $args );
 	return $args;
 }
 /**
-* Builds an object with all post type capabilities out of a post type object
+* Build an object with all post type capabilities out of a post type object
 *
 * Post type capabilities use the 'capability_type' argument as a base, if the
 * capability is not set in the 'capabilities' argument array or if the
 * 'capabilities' argument is not supplied.
 *
 *
 * These additional capabilities are only used in map_meta_cap(). Thus, they are
 * only assigned by default if the post type is registered with the 'map_meta_cap'
 * argument set to true (default is false).
 *
+* @since 3.0.0
+*
+* @see register_post_type()
 * @see map_meta_cap()
-* @since 3.0.0
+*
-*
+* @param object $args Post type registration arguments.
-* @param object $args Post type registration arguments
+* @return object object with all the capabilities as member variables.
-* @return object object with all the capabilities as member variables
 */
 function get_post_type_capabilities( $args ) {
 	if ( ! is_array( $args->capability_type ) )
 		$args->capability_type = array( $args->capability_type, $args->capability_type . 's' );
 	return (object) $capabilities;
 }
 /**
-* Stores or returns a list of post type meta caps for map_meta_cap().
+* Store or return a list of post type meta caps for map_meta_cap().
 *
 * @since 3.1.0
 * @access private
+*
+* @param null|array $capabilities Post type meta capabilities.
 */
 function _post_type_meta_capabilities( $capabilities = null ) {
 	static $meta_caps = array();
 	if ( null === $capabilities )
 		return $meta_caps;
 			$meta_caps[ $custom ] = $core;
 	}
 }
 /**
-* Builds an object with all post type labels out of a post type object
+* Build an object with all post type labels out of a post type object
 *
 * Accepted keys of the label array in the post type object:
-* - name - general name for the post type, usually plural. The same and overridden by $post_type_object->label. Default is Posts/Pages
+*
+* - name - general name for the post type, usually plural. The same and overridden
+*          by $post_type_object->label. Default is Posts/Pages
 * - singular_name - name for one object of this post type. Default is Post/Page
-* - add_new - Default is Add New for both hierarchical and non-hierarchical types. When internationalizing this string, please use a {@link http://codex.wordpress.org/I18n_for_WordPress_Developers#Disambiguation_by_context gettext context} matching your post type. Example: <code>_x('Add New', 'product');</code>
+* - add_new - Default is Add New for both hierarchical and non-hierarchical types.
-* - add_new_item - Default is Add New Post/Add New Page
+*             When internationalizing this string, please use a gettext context
-* - edit_item - Default is Edit Post/Edit Page
+*             {@link https://codex.wordpress.org/I18n_for_WordPress_Developers#Disambiguation_by_context}
-* - new_item - Default is New Post/New Page
+*             matching your post type. Example: `_x( 'Add New', 'product' );`.
-* - view_item - Default is View Post/View Page
+* - add_new_item - Default is Add New Post/Add New Page.
-* - search_items - Default is Search Posts/Search Pages
+* - edit_item - Default is Edit Post/Edit Page.
-* - not_found - Default is No posts found/No pages found
+* - new_item - Default is New Post/New Page.
-* - not_found_in_trash - Default is No posts found in Trash/No pages found in Trash
+* - view_item - Default is View Post/View Page.
-* - parent_item_colon - This string isn't used on non-hierarchical types. In hierarchical ones the default is Parent Page:
+* - search_items - Default is Search Posts/Search Pages.
-* - all_items - String for the submenu. Default is All Posts/All Pages
+* - not_found - Default is No posts found/No pages found.
-* - menu_name - Default is the same as <code>name</code>
+* - not_found_in_trash - Default is No posts found in Trash/No pages found in Trash.
-*
+* - parent_item_colon - This string isn't used on non-hierarchical types. In hierarchical
-* Above, the first default value is for non-hierarchical post types (like posts) and the second one is for hierarchical post types (like pages).
+*                       ones the default is 'Parent Page:'.
+* - all_items - String for the submenu. Default is All Posts/All Pages.
+* - menu_name - Default is the same as `name`.
+*
+* Above, the first default value is for non-hierarchical post types (like posts)
+* and the second one is for hierarchical post types (like pages).
 *
 * @since 3.0.0
 * @access private
 *
-* @param object $post_type_object
+* @param object $post_type_object Post type object.
-* @return object object with all the labels as member variables
+* @return object object with all the labels as member variables.
 */
 function get_post_type_labels( $post_type_object ) {
 	$nohier_vs_hier_defaults = array(
 		'name' => array( _x('Posts', 'post type general name'), _x('Pages', 'post type general name') ),
 		'singular_name' => array( _x('Post', 'post type singular name'), _x('Page', 'post type singular name') ),
 	$nohier_vs_hier_defaults['menu_name'] = $nohier_vs_hier_defaults['name'];
 	$labels = _get_custom_object_labels( $post_type_object, $nohier_vs_hier_defaults );
 	$post_type = $post_type_object->name;
+	/**
+	 * Filter the labels of a specific post type.
+	 *
+	 * The dynamic portion of the hook name, `$post_type`, refers to
+	 * the post type slug.
+	 *
+	 * @since 3.5.0
+	 *
+	 * @see get_post_type_labels() for the full list of labels.
+	 *
+	 * @param array $labels Array of labels for the given post type.
+	 */
 	return apply_filters( "post_type_labels_{$post_type}", $labels );
 }
 /**
-* Builds an object with custom-something object (post type, taxonomy) labels out of a custom-something object
+* Build an object with custom-something object (post type, taxonomy) labels
-*
+* out of a custom-something object
+*
+* @since 3.0.0
 * @access private
-* @since 3.0.0
+*
+* @param object $object                  A custom-something object.
+* @param array  $nohier_vs_hier_defaults Hierarchical vs non-hierarchical default labels.
 */
 function _get_custom_object_labels( $object, $nohier_vs_hier_defaults ) {
 	$object->labels = (array) $object->labels;
 	if ( isset( $object->label ) && empty( $object->labels['name'] ) )
 		$object->labels['menu_name'] = $object->labels['name'];
 	if ( !isset( $object->labels['all_items'] ) && isset( $object->labels['menu_name'] ) )
 		$object->labels['all_items'] = $object->labels['menu_name'];
-	foreach ( $nohier_vs_hier_defaults as $key => $value )
+	$defaults = array();
-			$defaults[$key] = $object->hierarchical ? $value[1] : $value[0];
+	foreach ( $nohier_vs_hier_defaults as $key => $value ) {
+		$defaults[$key] = $object->hierarchical ? $value[1] : $value[0];
+	}
 	$labels = array_merge( $defaults, $object->labels );
 	return (object)$labels;
 }
 /**
-* Adds submenus for post types.
+* Add submenus for post types.
 *
 * @access private
 * @since 3.1.0
 */
 function _add_post_type_submenus() {
 	foreach ( get_post_types( array( 'show_ui' => true ) ) as $ptype ) {
 		$ptype_obj = get_post_type_object( $ptype );
-		// Submenus only.
+		// Sub-menus only.
 		if ( ! $ptype_obj->show_in_menu || $ptype_obj->show_in_menu === true )
 			continue;
 		add_submenu_page( $ptype_obj->show_in_menu, $ptype_obj->labels->name, $ptype_obj->labels->all_items, $ptype_obj->cap->edit_posts, "edit.php?post_type=$ptype" );
 	}
 }
-add_action( 'admin_menu', '_add_post_type_submenus' );
 /**
 * Register support of certain features for a post type.
 *
-* All features are directly associated with a functional area of the edit screen, such as the
+* All core features are directly associated with a functional area of the edit
-* editor or a meta box: 'title', 'editor', 'comments', 'revisions', 'trackbacks', 'author',
+* screen, such as the editor or a meta box. Features include: 'title', 'editor',
-* 'excerpt', 'page-attributes', 'thumbnail', and 'custom-fields'.
+* 'comments', 'revisions', 'trackbacks', 'author', 'excerpt', 'page-attributes',
-*
+* 'thumbnail', 'custom-fields', and 'post-formats'.
-* Additionally, the 'revisions' feature dictates whether the post type will store revisions,
+*
-* and the 'comments' feature dictates whether the comments count will show on the edit screen.
+* Additionally, the 'revisions' feature dictates whether the post type will
+* store revisions, and the 'comments' feature dictates whether the comments
+* count will show on the edit screen.
 *
 * @since 3.0.0
-* @param string $post_type The post type for which to add the feature
+*
-* @param string|array $feature the feature being added, can be an array of feature strings or a single string
+* @param string       $post_type The post type for which to add the feature.
+* @param string|array $feature   The feature being added, accepts an array of
+*                                feature strings or a single string.
 */
 function add_post_type_support( $post_type, $feature ) {
 	global $_wp_post_type_features;
 	$features = (array) $feature;
 /**
 * Remove support for a feature from a post type.
 *
 * @since 3.0.0
-* @param string $post_type The post type for which to remove the feature
+*
-* @param string $feature The feature being removed
+* @param string $post_type The post type for which to remove the feature.
+* @param string $feature   The feature being removed.
 */
 function remove_post_type_support( $post_type, $feature ) {
 	global $_wp_post_type_features;
 	if ( isset( $_wp_post_type_features[$post_type][$feature] ) )
 /**
 * Get all the post type features
 *
 * @since 3.4.0
-* @param string $post_type The post type
+*
-* @return array
+* @param string $post_type The post type.
-*/
+* @return array Post type supports list.
+*/
 function get_all_post_type_supports( $post_type ) {
 	global $_wp_post_type_features;
 	if ( isset( $_wp_post_type_features[$post_type] ) )
 		return $_wp_post_type_features[$post_type];
 	return array();
 }
 /**
-* Checks a post type's support for a given feature
+* Check a post type's support for a given feature.
 *
 * @since 3.0.0
-* @param string $post_type The post type being checked
+*
-* @param string $feature the feature being checked
+* @param string $post_type The post type being checked.
-* @return boolean
+* @param string $feature the feature being checked.
-*/
+* @return bool Whether the post type supports the given feature.
+*/
 function post_type_supports( $post_type, $feature ) {
 	global $_wp_post_type_features;
 	return ( isset( $_wp_post_type_features[$post_type][$feature] ) );
 }
 /**
-* Updates the post type for the post ID.
+* Update the post type for the post ID.
 *
 * The page or post cache will be cleaned for the post ID.
 *
 * @since 2.5.0
 *
-* @uses $wpdb
+* @global wpdb $wpdb WordPress database abstraction object.
 *
-* @param int $post_id Post ID to change post type. Not actually optional.
+* @param int    $post_id   Optional. Post ID to change post type. Default 0.
-* @param string $post_type Optional, default is post. Supported values are 'post' or 'page' to
+* @param string $post_type Optional. Post type. Accepts 'post' or 'page' to
-*  name a few.
+*                          name a few. Default 'post'.
 * @return int Amount of rows changed. Should be 1 for success and 0 for failure.
 */
 function set_post_type( $post_id = 0, $post_type = 'post' ) {
 	global $wpdb;
 /**
 * Retrieve list of latest posts or posts matching criteria.
 *
 * The defaults are as follows:
-*     'numberposts' - Default is 5. Total number of posts to retrieve.
-*     'offset' - Default is 0. See {@link WP_Query::query()} for more.
-*     'category' - What category to pull the posts from.
-*     'orderby' - Default is 'post_date'. How to order the posts.
-*     'order' - Default is 'DESC'. The order to retrieve the posts.
-*     'include' - See {@link WP_Query::query()} for more.
-*     'exclude' - See {@link WP_Query::query()} for more.
-*     'meta_key' - See {@link WP_Query::query()} for more.
-*     'meta_value' - See {@link WP_Query::query()} for more.
-*     'post_type' - Default is 'post'. Can be 'page', or 'attachment' to name a few.
-*     'post_parent' - The parent of the post or post type.
-*     'post_status' - Default is 'publish'. Post status to retrieve.
 *
 * @since 1.2.0
-* @uses WP_Query::query() See for more default arguments and information.
+*
-* @link http://codex.wordpress.org/Template_Tags/get_posts
+* @see WP_Query::parse_query()
 *
-* @param array $args Optional. Overrides defaults.
+* @param array $args {
+*     Optional. Arguments to retrieve posts. {@see WP_Query::parse_query()} for more
+*     available arguments.
+*
+*     @type int        $numberposts      Total number of posts to retrieve. Is an alias of $posts_per_page
+*                                        in WP_Query. Accepts 1+ and -1 for all. Default 5.
+*     @type int        $offset           The number of posts to offset before retrieval. Default 0.
+*     @type int|string $category         Category ID or comma-separated list of IDs (this or any children).
+*                                        Is an alias of $cat in WP_Query. Default 0.
+*     @type string     $orderby          Which field to order posts by. Accepts post fields. Default 'date'.
+*     @type array      $include          An array of post IDs to retrieve, sticky posts will be included.
+*                                        Is an alias of $post__in in WP_Query. Default empty array.
+*     @type array      $exclude          An array of post IDs not to retrieve. Default empty array.
+*     @type string     $meta_key         Custom field key. Default empty.
+*     @type mixed      $meta_value       Custom field value. Default empty string.
+*     @type string     $post_type        Post type. Default 'post'.
+*     @type bool       $suppress_filters Whether to suppress filters. Default true.
+* }
 * @return array List of posts.
 */
-function get_posts($args = null) {
+function get_posts( $args = null ) {
 	$defaults = array(
 		'numberposts' => 5, 'offset' => 0,
-		'category' => 0, 'orderby' => 'post_date',
+		'category' => 0, 'orderby' => 'date',
 		'order' => 'DESC', 'include' => array(),
 		'exclude' => array(), 'meta_key' => '',
 		'meta_value' =>'', 'post_type' => 'post',
 		'suppress_filters' => true
 	);
 * Add meta data field to a post.
 *
 * Post meta data is called "Custom Fields" on the Administration Screen.
 *
 * @since 1.5.0
-* @link http://codex.wordpress.org/Function_Reference/add_post_meta
+*
-*
+* @param int    $post_id    Post ID.
-* @param int $post_id Post ID.
+* @param string $meta_key   Metadata name.
-* @param string $meta_key Metadata name.
+* @param mixed  $meta_value Metadata value. Must be serializable if non-scalar.
-* @param mixed $meta_value Metadata value. Must be serializable if non-scalar.
+* @param bool   $unique     Optional. Whether the same key should not be added.
-* @param bool $unique Optional, default is false. Whether the same key should not be added.
+*                           Default false.
 * @return int|bool Meta ID on success, false on failure.
 */
-function add_post_meta($post_id, $meta_key, $meta_value, $unique = false) {
+function add_post_meta( $post_id, $meta_key, $meta_value, $unique = false ) {
-	// make sure meta is added to the post, not a revision
+	// Make sure meta is added to the post, not a revision.
 	if ( $the_post = wp_is_post_revision($post_id) )
 		$post_id = $the_post;
 	return add_metadata('post', $post_id, $meta_key, $meta_value, $unique);
 }
 * You can match based on the key, or key and value. Removing based on key and
 * value, will keep from removing duplicate metadata with the same key. It also
 * allows removing all metadata matching key, if needed.
 *
 * @since 1.5.0
-* @link http://codex.wordpress.org/Function_Reference/delete_post_meta
+*
-*
+* @param int    $post_id    Post ID.
-* @param int $post_id post ID
+* @param string $meta_key   Metadata name.
-* @param string $meta_key Metadata name.
+* @param mixed  $meta_value Optional. Metadata value. Must be serializable if
-* @param mixed $meta_value Optional. Metadata value. Must be serializable if non-scalar.
+*                           non-scalar. Default empty.
 * @return bool True on success, false on failure.
 */
-function delete_post_meta($post_id, $meta_key, $meta_value = '') {
+function delete_post_meta( $post_id, $meta_key, $meta_value = '' ) {
-	// make sure meta is added to the post, not a revision
+	// Make sure meta is added to the post, not a revision.
 	if ( $the_post = wp_is_post_revision($post_id) )
 		$post_id = $the_post;
 	return delete_metadata('post', $post_id, $meta_key, $meta_value);
 }
 /**
 * Retrieve post meta field for a post.
 *
 * @since 1.5.0
-* @link http://codex.wordpress.org/Function_Reference/get_post_meta
+*
-*
+* @param int    $post_id Post ID.
-* @param int $post_id Post ID.
+* @param string $key     Optional. The meta key to retrieve. By default, returns
-* @param string $key Optional. The meta key to retrieve. By default, returns data for all keys.
+*                        data for all keys. Default empty.
-* @param bool $single Whether to return a single value.
+* @param bool   $single  Optional. Whether to return a single value. Default false.
-* @return mixed Will be an array if $single is false. Will be value of meta data field if $single
+* @return mixed Will be an array if $single is false. Will be value of meta data
-*  is true.
+*               field if $single is true.
 */
-function get_post_meta($post_id, $key = '', $single = false) {
+function get_post_meta( $post_id, $key = '', $single = false ) {
 	return get_metadata('post', $post_id, $key, $single);
 }
 /**
 * Update post meta field based on post ID.
 * same key and post ID.
 *
 * If the meta field for the post does not exist, it will be added.
 *
 * @since 1.5.0
-* @link http://codex.wordpress.org/Function_Reference/update_post_meta
+*
-*
+* @param int    $post_id    Post ID.
-* @param int $post_id Post ID.
+* @param string $meta_key   Metadata key.
-* @param string $meta_key Metadata key.
+* @param mixed  $meta_value Metadata value. Must be serializable if non-scalar.
-* @param mixed $meta_value Metadata value. Must be serializable if non-scalar.
+* @param mixed  $prev_value Optional. Previous value to check before removing.
-* @param mixed $prev_value Optional. Previous value to check before removing.
+*                           Default empty.
-* @return bool True on success, false on failure.
+* @return int|bool Meta ID if the key didn't exist, true on successful update,
-*/
+*                  false on failure.
-function update_post_meta($post_id, $meta_key, $meta_value, $prev_value = '') {
+*/
-	// make sure meta is added to the post, not a revision
+function update_post_meta( $post_id, $meta_key, $meta_value, $prev_value = '' ) {
+	// Make sure meta is added to the post, not a revision.
 	if ( $the_post = wp_is_post_revision($post_id) )
 		$post_id = $the_post;
 	return update_metadata('post', $post_id, $meta_key, $meta_value, $prev_value);
 }
 * Delete everything from post meta matching meta key.
 *
 * @since 2.3.0
 *
 * @param string $post_meta_key Key to search for when deleting.
-* @return bool Whether the post meta key was deleted from the database
+* @return bool Whether the post meta key was deleted from the database.
 */
-function delete_post_meta_by_key($post_meta_key) {
+function delete_post_meta_by_key( $post_meta_key ) {
 	return delete_metadata( 'post', null, $post_meta_key, '', true );
 }
 /**
 * Retrieve post meta fields, based on post ID.
 *
 * The post meta fields are retrieved from the cache where possible,
 * so the function is optimized to be called more than once.
 *
 * @since 1.2.0
-* @link http://codex.wordpress.org/Function_Reference/get_post_custom
+*
-*
+* @param int $post_id Optional. Post ID. Default is ID of the global $post.
-* @param int $post_id Post ID.
+* @return array Post meta for the given post.
-* @return array
 */
 function get_post_custom( $post_id = 0 ) {
 	$post_id = absint( $post_id );
 	if ( ! $post_id )
 		$post_id = get_the_ID();
 * Retrieve meta field names for a post.
 *
 * If there are no meta fields, then nothing (null) will be returned.
 *
 * @since 1.2.0
-* @link http://codex.wordpress.org/Function_Reference/get_post_custom_keys
+*
-*
+* @param int $post_id Optional. Post ID. Default is ID of the global $post.
-* @param int $post_id post ID
+* @return array|null Either array of the keys, or null if keys could not be
-* @return array|null Either array of the keys, or null if keys could not be retrieved.
+*                    retrieved.
 */
 function get_post_custom_keys( $post_id = 0 ) {
 	$custom = get_post_custom( $post_id );
 	if ( !is_array($custom) )
 *
 * The parameters must not be considered optional. All of the post meta fields
 * will be retrieved and only the meta field key values returned.
 *
 * @since 1.2.0
-* @link http://codex.wordpress.org/Function_Reference/get_post_custom_values
+*
-*
+* @param string $key     Optional. Meta field key. Default empty.
-* @param string $key Meta field key.
+* @param int    $post_id Optional. Post ID. Default is ID of the global $post.
-* @param int $post_id Post ID
 * @return array Meta field values.
 */
 function get_post_custom_values( $key = '', $post_id = 0 ) {
 	if ( !$key )
 		return null;
 * Sticky posts should remain at the top of The Loop. If the post ID is not
 * given, then The Loop ID for the current post will be used.
 *
 * @since 2.7.0
 *
-* @param int $post_id Optional. Post ID.
+* @param int $post_id Optional. Post ID. Default is ID of the global $post.
 * @return bool Whether post is sticky.
 */
 function is_sticky( $post_id = 0 ) {
 	$post_id = absint( $post_id );
 }
 /**
 * Sanitize every post field.
 *
-* If the context is 'raw', then the post object or array will get minimal santization of the int fields.
+* If the context is 'raw', then the post object or array will get minimal
+* sanitization of the integer fields.
 *
 * @since 2.3.0
-* @uses sanitize_post_field() Used to sanitize the fields.
+*
-*
+* @see sanitize_post_field()
-* @param object|WP_Post|array $post The Post Object or Array
+*
-* @param string $context Optional, default is 'display'. How to sanitize post fields.
+* @param object|WP_Post|array $post    The Post Object or Array
-* @return object|WP_Post|array The now sanitized Post Object or Array (will be the same type as $post)
+* @param string               $context Optional. How to sanitize post fields.
-*/
+*                                      Accepts 'raw', 'edit', 'db', or 'display'.
-function sanitize_post($post, $context = 'display') {
+*                                      Default 'display'.
+* @return object|WP_Post|array The now sanitized Post Object or Array (will be the
+*                              same type as $post).
+*/
+function sanitize_post( $post, $context = 'display' ) {
 	if ( is_object($post) ) {
-		// Check if post already filtered for this context
+		// Check if post already filtered for this context.
 		if ( isset($post->filter) && $context == $post->filter )
 			return $post;
 		if ( !isset($post->ID) )
 			$post->ID = 0;
 		foreach ( array_keys(get_object_vars($post)) as $field )
 			$post->$field = sanitize_post_field($field, $post->$field, $post->ID, $context);
 		$post->filter = $context;
 	} else {
-		// Check if post already filtered for this context
+		// Check if post already filtered for this context.
 		if ( isset($post['filter']) && $context == $post['filter'] )
 			return $post;
 		if ( !isset($post['ID']) )
 			$post['ID'] = 0;
 		foreach ( array_keys($post) as $field )
 }
 /**
 * Sanitize post field based on context.
 *
-* Possible context values are:  'raw', 'edit', 'db', 'display', 'attribute' and 'js'. The
+* Possible context values are:  'raw', 'edit', 'db', 'display', 'attribute' and
-* 'display' context is used by default. 'attribute' and 'js' contexts are treated like 'display'
+* 'js'. The 'display' context is used by default. 'attribute' and 'js' contexts
-* when calling filters.
+* are treated like 'display' when calling filters.
 *
 * @since 2.3.0
-* @uses apply_filters() Calls 'edit_$field' and '{$field_no_prefix}_edit_pre' passing $value and
+*
-*  $post_id if $context == 'edit' and field name prefix == 'post_'.
+* @param string $field   The Post Object field name.
-*
+* @param mixed  $value   The Post Object value.
-* @uses apply_filters() Calls 'edit_post_$field' passing $value and $post_id if $context == 'db'.
+* @param int    $post_id Post ID.
-* @uses apply_filters() Calls 'pre_$field' passing $value if $context == 'db' and field name prefix == 'post_'.
+* @param string $context How to sanitize post fields. Looks for 'raw', 'edit',
-* @uses apply_filters() Calls '{$field}_pre' passing $value if $context == 'db' and field name prefix != 'post_'.
+*                        'db', 'display', 'attribute' and 'js'.
-*
-* @uses apply_filters() Calls '$field' passing $value, $post_id and $context if $context == anything
-*  other than 'raw', 'edit' and 'db' and field name prefix == 'post_'.
-* @uses apply_filters() Calls 'post_$field' passing $value if $context == anything other than 'raw',
-*  'edit' and 'db' and field name prefix != 'post_'.
-*
-* @param string $field The Post Object field name.
-* @param mixed $value The Post Object value.
-* @param int $post_id Post ID.
-* @param string $context How to sanitize post fields. Looks for 'raw', 'edit', 'db', 'display',
-*               'attribute' and 'js'.
 * @return mixed Sanitized value.
 */
 function sanitize_post_field($field, $value, $post_id, $context) {
 	$int_fields = array('ID', 'post_parent', 'menu_order');
 	if ( in_array($field, $int_fields) )
 		$value = (int) $value;
-	// Fields which contain arrays of ints.
+	// Fields which contain arrays of integers.
 	$array_int_fields = array( 'ancestors' );
 	if ( in_array($field, $array_int_fields) ) {
 		$value = array_map( 'absint', $value);
 		return $value;
 	}
 	if ( 'edit' == $context ) {
 		$format_to_edit = array('post_content', 'post_excerpt', 'post_title', 'post_password');
 		if ( $prefixed ) {
-			$value = apply_filters("edit_{$field}", $value, $post_id);
-			// Old school
+			/**
-			$value = apply_filters("{$field_no_prefix}_edit_pre", $value, $post_id);
+			 * Filter the value of a specific post field to edit.
+			 *
+			 * The dynamic portion of the hook name, `$field`, refers to the post
+			 * field name.
+			 *
+			 * @since 2.3.0
+			 *
+			 * @param mixed $value   Value of the post field.
+			 * @param int   $post_id Post ID.
+			 */
+			$value = apply_filters( "edit_{$field}", $value, $post_id );
+			/**
+			 * Filter the value of a specific post field to edit.
+			 *
+			 * The dynamic portion of the hook name, `$field_no_prefix`, refers to
+			 * the post field name.
+			 *
+			 * @since 2.3.0
+			 *
+			 * @param mixed $value   Value of the post field.
+			 * @param int   $post_id Post ID.
+			 */
+			$value = apply_filters( "{$field_no_prefix}_edit_pre", $value, $post_id );
 		} else {
-			$value = apply_filters("edit_post_{$field}", $value, $post_id);
+			$value = apply_filters( "edit_post_{$field}", $value, $post_id );
 		}
 		if ( in_array($field, $format_to_edit) ) {
 			if ( 'post_content' == $field )
 				$value = format_to_edit($value, user_can_richedit());
 			else
 				$value = format_to_edit($value);
 		} else {
 			$value = esc_attr($value);
 		}
-	} else if ( 'db' == $context ) {
+	} elseif ( 'db' == $context ) {
 		if ( $prefixed ) {
-			$value = apply_filters("pre_{$field}", $value);
-			$value = apply_filters("{$field_no_prefix}_save_pre", $value);
+			/**
+			 * Filter the value of a specific post field before saving.
+			 *
+			 * The dynamic portion of the hook name, `$field`, refers to the post
+			 * field name.
+			 *
+			 * @since 2.3.0
+			 *
+			 * @param mixed $value Value of the post field.
+			 */
+			$value = apply_filters( "pre_{$field}", $value );
+			/**
+			 * Filter the value of a specific field before saving.
+			 *
+			 * The dynamic portion of the hook name, `$field_no_prefix`, refers
+			 * to the post field name.
+			 *
+			 * @since 2.3.0
+			 *
+			 * @param mixed $value Value of the post field.
+			 */
+			$value = apply_filters( "{$field_no_prefix}_save_pre", $value );
 		} else {
-			$value = apply_filters("pre_post_{$field}", $value);
+			$value = apply_filters( "pre_post_{$field}", $value );
-			$value = apply_filters("{$field}_pre", $value);
+			/**
+			 * Filter the value of a specific post field before saving.
+			 *
+			 * The dynamic portion of the hook name, `$field`, refers to the post
+			 * field name.
+			 *
+			 * @since 2.3.0
+			 *
+			 * @param mixed $value Value of the post field.
+			 */
+			$value = apply_filters( "{$field}_pre", $value );
 		}
 	} else {
 		// Use display filters by default.
-		if ( $prefixed )
+		if ( $prefixed ) {
-			$value = apply_filters($field, $value, $post_id, $context);
-		else
+			/**
-			$value = apply_filters("post_{$field}", $value, $post_id, $context);
+			 * Filter the value of a specific post field for display.
+			 *
+			 * The dynamic portion of the hook name, `$field`, refers to the post
+			 * field name.
+			 *
+			 * @since 2.3.0
+			 *
+			 * @param mixed  $value   Value of the prefixed post field.
+			 * @param int    $post_id Post ID.
+			 * @param string $context Context for how to sanitize the field. Possible
+			 *                        values include 'raw', 'edit', 'db', 'display',
+			 *                        'attribute' and 'js'.
+			 */
+			$value = apply_filters( $field, $value, $post_id, $context );
+		} else {
+			$value = apply_filters( "post_{$field}", $value, $post_id, $context );
+		}
 	}
 	if ( 'attribute' == $context )
 		$value = esc_attr($value);
-	else if ( 'js' == $context )
+	elseif ( 'js' == $context )
 		$value = esc_js($value);
 	return $value;
 }
 *
 * @since 2.7.0
 *
 * @param int $post_id Post ID.
 */
-function stick_post($post_id) {
+function stick_post( $post_id ) {
 	$stickies = get_option('sticky_posts');
 	if ( !is_array($stickies) )
 		$stickies = array($post_id);
 	update_option('sticky_posts', $stickies);
 }
 /**
-* Unstick a post.
+* Un-stick a post.
 *
 * Sticky posts should be displayed at the top of the front page.
 *
 * @since 2.7.0
 *
 * @param int $post_id Post ID.
 */
-function unstick_post($post_id) {
+function unstick_post( $post_id ) {
 	$stickies = get_option('sticky_posts');
 	if ( !is_array($stickies) )
 		return;
 		return;
 	array_splice($stickies, $offset, 1);
 	update_option('sticky_posts', $stickies);
+}
+/**
+* Return the cache key for wp_count_posts() based on the passed arguments.
+*
+* @since 3.9.0
+*
+* @param string $type Optional. Post type to retrieve count Default 'post'.
+* @param string $perm Optional. 'readable' or empty. Default empty.
+* @return string The cache key.
+*/
+function _count_posts_cache_key( $type = 'post', $perm = '' ) {
+	$cache_key = 'posts-' . $type;
+	if ( 'readable' == $perm && is_user_logged_in() ) {
+		$post_type_object = get_post_type_object( $type );
+		if ( $post_type_object && ! current_user_can( $post_type_object->cap->read_private_posts ) ) {
+			$cache_key .= '_' . $perm . '_' . get_current_user_id();
+		}
+	}
+	return $cache_key;
 }
 /**
 * Count number of posts of a post type and if user has permissions to view.
 *
 * when developing for 2.5+, use this function instead.
 *
 * The $perm parameter checks for 'readable' value and if the user can read
 * private posts, it will display that for the user that is signed in.
 *
-* @link http://codex.wordpress.org/Template_Tags/wp_count_posts
-*
 * @since 2.5.0
 *
-* @param string $type Optional. Post type to retrieve count
+* @param string $type Optional. Post type to retrieve count. Default 'post'.
-* @param string $perm Optional. 'readable' or empty.
+* @param string $perm Optional. 'readable' or empty. Default empty.
-* @return object Number of posts for each status
+* @return object Number of posts for each status.
 */
 function wp_count_posts( $type = 'post', $perm = '' ) {
 	global $wpdb;
 	if ( ! post_type_exists( $type ) )
 		return new stdClass;
-	$user = wp_get_current_user();
+	$cache_key = _count_posts_cache_key( $type, $perm );
-	$cache_key = 'posts-' . $type;
+	$counts = wp_cache_get( $cache_key, 'counts' );
+	if ( false !== $counts ) {
+		/** This filter is documented in wp-includes/post.php */
+		return apply_filters( 'wp_count_posts', $counts, $type, $perm );
+	}
 	$query = "SELECT post_status, COUNT( * ) AS num_posts FROM {$wpdb->posts} WHERE post_type = %s";
 	if ( 'readable' == $perm && is_user_logged_in() ) {
 		$post_type_object = get_post_type_object($type);
-		if ( !current_user_can( $post_type_object->cap->read_private_posts ) ) {
+		if ( ! current_user_can( $post_type_object->cap->read_private_posts ) ) {
-			$cache_key .= '_' . $perm . '_' . $user->ID;
+			$query .= $wpdb->prepare( " AND (post_status != 'private' OR ( post_author = %d AND post_status = 'private' ))",
-			$query .= " AND (post_status != 'private' OR ( post_author = '$user->ID' AND post_status = 'private' ))";
+				get_current_user_id()
+			);
 		}
 	}
 	$query .= ' GROUP BY post_status';
-	$counts = wp_cache_get( $cache_key, 'counts' );
+	$results = (array) $wpdb->get_results( $wpdb->prepare( $query, $type ), ARRAY_A );
-	if ( false === $counts ) {
+	$counts = array_fill_keys( get_post_stati(), 0 );
-		$results = (array) $wpdb->get_results( $wpdb->prepare( $query, $type ), ARRAY_A );
-		$counts = array_fill_keys( get_post_stati(), 0 );
+	foreach ( $results as $row ) {
+		$counts[ $row['post_status'] ] = $row['num_posts'];
-		foreach ( $results as $row )
+	}
-			$counts[ $row['post_status'] ] = $row['num_posts'];
+	$counts = (object) $counts;
-		$counts = (object) $counts;
+	wp_cache_set( $cache_key, $counts, 'counts' );
-		wp_cache_set( $cache_key, $counts, 'counts' );
-	}
 	/**
 	 * Modify returned post counts by status for the current post type.
 	 *
 	 * @since 3.7.0
 	 *
-	 * @param object $counts An object containing the current post_type's post counts by status.
+	 * @param object $counts An object containing the current post_type's post
-	 * @param string $type   The post type.
+	 *                       counts by status.
-	 * @param string $perm   The permission to determine if the posts are 'readable' by the current user.
+	 * @param string $type   Post type.
+	 * @param string $perm   The permission to determine if the posts are 'readable'
+	 *                       by the current user.
 	 */
 	return apply_filters( 'wp_count_posts', $counts, $type, $perm );
 }
 /**
 * you the number of attachments that are children of a post. You can get that
 * by counting the number of children that post has.
 *
 * @since 2.5.0
 *
-* @param string|array $mime_type Optional. Array or comma-separated list of MIME patterns.
+* @param string|array $mime_type Optional. Array or comma-separated list of
-* @return array Number of posts for each mime type.
+*                                MIME patterns. Default empty.
+* @return object An object containing the attachment counts by mime type.
 */
 function wp_count_attachments( $mime_type = '' ) {
 	global $wpdb;
 	$and = wp_post_mime_type_where( $mime_type );
 	/**
 	 * Modify returned attachment counts by mime type.
 	 *
 	 * @since 3.7.0
 	 *
-	 * @param object $counts    An object containing the attachment counts by mime type.
+	 * @param object $counts    An object containing the attachment counts by
-	 * @param string $mime_type The mime type pattern used to filter the attachments counted.
+	 *                          mime type.
+	 * @param string $mime_type The mime type pattern used to filter the attachments
+	 *                          counted.
 	 */
 	return apply_filters( 'wp_count_attachments', (object) $counts, $mime_type );
 }
 /**
-* Get default post mime types
+* Get default post mime types.
 *
 * @since 2.9.0
 *
-* @return array
+* @return array List of post mime types.
 */
 function get_post_mime_types() {
 	$post_mime_types = array(	//	array( adj, noun )
 		'image' => array(__('Images'), __('Manage Images'), _n_noop('Image <span class="count">(%s)</span>', 'Images <span class="count">(%s)</span>')),
 		'audio' => array(__('Audio'), __('Manage Audio'), _n_noop('Audio <span class="count">(%s)</span>', 'Audio <span class="count">(%s)</span>')),
 		'video' => array(__('Video'), __('Manage Video'), _n_noop('Video <span class="count">(%s)</span>', 'Video <span class="count">(%s)</span>')),
 	);
-	return apply_filters('post_mime_types', $post_mime_types);
+	/**
+	 * Filter the default list of post mime types.
+	 *
+	 * @since 2.5.0
+	 *
+	 * @param array $post_mime_types Default list of post mime types.
+	 */
+	return apply_filters( 'post_mime_types', $post_mime_types );
 }
 /**
 * Check a MIME-Type against a list.
 *
 * list. If the real_mime_types is a string, it is also comma separated to
 * create the list.
 *
 * @since 2.5.0
 *
-* @param string|array $wildcard_mime_types e.g. audio/mpeg or image (same as image/*) or
+* @param string|array $wildcard_mime_types Mime types, e.g. audio/mpeg or image (same as image/*)
-*  flash (same as *flash*).
+*                                          or flash (same as *flash*).
-* @param string|array $real_mime_types post_mime_type values
+* @param string|array $real_mime_types     Real post mime type values.
-* @return array array(wildcard=>array(real types))
+* @return array array(wildcard=>array(real types)).
 */
-function wp_match_mime_types($wildcard_mime_types, $real_mime_types) {
+function wp_match_mime_types( $wildcard_mime_types, $real_mime_types ) {
 	$matches = array();
-	if ( is_string($wildcard_mime_types) )
+	if ( is_string( $wildcard_mime_types ) ) {
-		$wildcard_mime_types = array_map('trim', explode(',', $wildcard_mime_types));
+		$wildcard_mime_types = array_map( 'trim', explode( ',', $wildcard_mime_types ) );
-	if ( is_string($real_mime_types) )
+	}
-		$real_mime_types = array_map('trim', explode(',', $real_mime_types));
+	if ( is_string( $real_mime_types ) ) {
+		$real_mime_types = array_map( 'trim', explode( ',', $real_mime_types ) );
+	}
+	$patternses = array();
 	$wild = '[-._a-z0-9]*';
 	foreach ( (array) $wildcard_mime_types as $type ) {
-		$type = str_replace('*', $wild, $type);
+		$mimes = array_map( 'trim', explode( ',', $type ) );
-		$patternses[1][$type] = "^$type$";
+		foreach ( $mimes as $mime ) {
-		if ( false === strpos($type, '/') ) {
+			$regex = str_replace( '__wildcard__', $wild, preg_quote( str_replace( '*', '__wildcard__', $mime ) ) );
-			$patternses[2][$type] = "^$type/";
+			$patternses[][$type] = "^$regex$";
-			$patternses[3][$type] = $type;
+			if ( false === strpos( $mime, '/' ) ) {
-		}
+				$patternses[][$type] = "^$regex/";
-	}
+				$patternses[][$type] = $regex;
-	asort($patternses);
+			}
-	foreach ( $patternses as $patterns )
+		}
-		foreach ( $patterns as $type => $pattern )
+	}
-			foreach ( (array) $real_mime_types as $real )
+	asort( $patternses );
-				if ( preg_match("#$pattern#", $real) && ( empty($matches[$type]) || false === array_search($real, $matches[$type]) ) )
+	foreach ( $patternses as $patterns ) {
+		foreach ( $patterns as $type => $pattern ) {
+			foreach ( (array) $real_mime_types as $real ) {
+				if ( preg_match( "#$pattern#", $real ) && ( empty( $matches[$type] ) || false === array_search( $real, $matches[$type] ) ) ) {
 					$matches[$type][] = $real;
+				}
+			}
+		}
+	}
 	return $matches;
 }
 /**
 * Convert MIME types into SQL.
 *
 * @since 2.5.0
 *
-* @param string|array $post_mime_types List of mime types or comma separated string of mime types.
+* @param string|array $post_mime_types List of mime types or comma separated string
-* @param string $table_alias Optional. Specify a table alias, if needed.
+*                                      of mime types.
+* @param string       $table_alias     Optional. Specify a table alias, if needed.
+*                                      Default empty.
 * @return string The SQL AND clause for mime searching.
 */
-function wp_post_mime_type_where($post_mime_types, $table_alias = '') {
+function wp_post_mime_type_where( $post_mime_types, $table_alias = '' ) {
 	$where = '';
 	$wildcards = array('', '%', '%/%');
 	if ( is_string($post_mime_types) )
 		$post_mime_types = array_map('trim', explode(',', $post_mime_types));
+	$wheres = array();
 	foreach ( (array) $post_mime_types as $mime_type ) {
 		$mime_type = preg_replace('/\s/', '', $mime_type);
 		$slashpos = strpos($mime_type, '/');
 		if ( false !== $slashpos ) {
 			$mime_group = preg_replace('/[^-*.a-zA-Z0-9]/', '', substr($mime_type, 0, $slashpos));
 		$where = ' AND (' . join(' OR ', $wheres) . ') ';
 	return $where;
 }
 /**
-* Trashes or deletes a post or page.
+* Trash or delete a post or page.
 *
-* When the post and page is permanently deleted, everything that is tied to it is deleted also.
+* When the post and page is permanently deleted, everything that is tied to
-* This includes comments, post meta fields, and terms associated with the post.
+* it is deleted also. This includes comments, post meta fields, and terms
-*
+* associated with the post.
-* The post or page is moved to trash instead of permanently deleted unless trash is
+*
-* disabled, item is already in the trash, or $force_delete is true.
+* The post or page is moved to trash instead of permanently deleted unless
+* trash is disabled, item is already in the trash, or $force_delete is true.
 *
 * @since 1.0.0
-* @uses do_action() on 'delete_post' before deletion unless post type is 'attachment'.
+*
-* @uses do_action() on 'deleted_post' after deletion unless post type is 'attachment'.
+* @global wpdb $wpdb WordPress database abstraction object.
-* @uses wp_delete_attachment() if post type is 'attachment'.
+* @see wp_delete_attachment()
-* @uses wp_trash_post() if item should be trashed.
+* @see wp_trash_post()
 *
-* @param int $postid Post ID.
+* @param int  $postid       Optional. Post ID. Default 0.
-* @param bool $force_delete Whether to bypass trash and force deletion. Defaults to false.
+* @param bool $force_delete Optional. Whether to bypass trash and force deletion.
-* @return mixed False on failure
+*                           Default false.
+* @return array|bool|WP_Post False on failure.
 */
 function wp_delete_post( $postid = 0, $force_delete = false ) {
 	global $wpdb;
 	if ( !$post = $wpdb->get_row($wpdb->prepare("SELECT * FROM $wpdb->posts WHERE ID = %d", $postid)) )
 			return wp_trash_post($postid);
 	if ( $post->post_type == 'attachment' )
 		return wp_delete_attachment( $postid, $force_delete );
-	do_action('before_delete_post', $postid);
+	/**
+	 * Fires before a post is deleted, at the start of wp_delete_post().
+	 *
+	 * @since 3.2.0
+	 *
+	 * @see wp_delete_post()
+	 *
+	 * @param int $postid Post ID.
+	 */
+	do_action( 'before_delete_post', $postid );
 	delete_post_meta($postid,'_wp_trash_meta_status');
 	delete_post_meta($postid,'_wp_trash_meta_time');
 	wp_delete_object_term_relationships($postid, get_object_taxonomies($post->post_type));
 	$parent_data = array( 'post_parent' => $post->post_parent );
 	$parent_where = array( 'post_parent' => $postid );
 	if ( is_post_type_hierarchical( $post->post_type ) ) {
-		// Point children of this page to its parent, also clean the cache of affected children
+		// Point children of this page to its parent, also clean the cache of affected children.
 		$children_query = $wpdb->prepare( "SELECT * FROM $wpdb->posts WHERE post_parent = %d AND post_type = %s", $postid, $post->post_type );
 		$children = $wpdb->get_results( $children_query );
 		$wpdb->update( $wpdb->posts, $parent_data, $parent_where + array( 'post_type' => $post->post_type ) );
 	}
-	// Do raw query. wp_get_post_revisions() is filtered
+	// Do raw query. wp_get_post_revisions() is filtered.
 	$revision_ids = $wpdb->get_col( $wpdb->prepare( "SELECT ID FROM $wpdb->posts WHERE post_parent = %d AND post_type = 'revision'", $postid ) );
 	// Use wp_delete_post (via wp_delete_post_revision) again. Ensures any meta/misplaced data gets cleaned up.
 	foreach ( $revision_ids as $revision_id )
 		wp_delete_post_revision( $revision_id );
-	// Point all attachments to this post up one level
+	// Point all attachments to this post up one level.
 	$wpdb->update( $wpdb->posts, $parent_data, $parent_where + array( 'post_type' => 'attachment' ) );
 	$comment_ids = $wpdb->get_col( $wpdb->prepare( "SELECT comment_ID FROM $wpdb->comments WHERE comment_post_ID = %d", $postid ));
 	foreach ( $comment_ids as $comment_id )
 		wp_delete_comment( $comment_id, true );
 	$post_meta_ids = $wpdb->get_col( $wpdb->prepare( "SELECT meta_id FROM $wpdb->postmeta WHERE post_id = %d ", $postid ));
 	foreach ( $post_meta_ids as $mid )
 		delete_metadata_by_mid( 'post', $mid );
+	/**
+	 * Fires immediately before a post is deleted from the database.
+	 *
+	 * @since 1.2.0
+	 *
+	 * @param int $postid Post ID.
+	 */
 	do_action( 'delete_post', $postid );
-	$wpdb->delete( $wpdb->posts, array( 'ID' => $postid ) );
+	$result = $wpdb->delete( $wpdb->posts, array( 'ID' => $postid ) );
+	if ( ! $result ) {
+		return false;
+	}
+	/**
+	 * Fires immediately after a post is deleted from the database.
+	 *
+	 * @since 2.2.0
+	 *
+	 * @param int $postid Post ID.
+	 */
 	do_action( 'deleted_post', $postid );
 	clean_post_cache( $post );
 	if ( is_post_type_hierarchical( $post->post_type ) && $children ) {
 			clean_post_cache( $child );
 	}
 	wp_clear_scheduled_hook('publish_future_post', array( $postid ) );
-	do_action('after_delete_post', $postid);
+	/**
+	 * Fires after a post is deleted, at the conclusion of wp_delete_post().
+	 *
+	 * @since 3.2.0
+	 *
+	 * @see wp_delete_post()
+	 *
+	 * @param int $postid Post ID.
+	 */
+	do_action( 'after_delete_post', $postid );
 	return $post;
 }
 /**
-* Resets the page_on_front, show_on_front, and page_for_post settings when a
+* Reset the page_on_front, show_on_front, and page_for_post settings when
-* linked page is deleted or trashed.
+* a linked page is deleted or trashed.
 *
 * Also ensures the post is no longer sticky.
 *
+* @since 3.7.0
 * @access private
-* @since 3.7.0
+*
-* @param $post_id
+* @param int $post_id Post ID.
 */
 function _reset_front_page_settings_for_post( $post_id ) {
 	$post = get_post( $post_id );
 	if ( 'page' == $post->post_type ) {
-	 	// If the page is defined in option page_on_front or post_for_posts,
+	 	/*
-		// adjust the corresponding options
+	 	 * If the page is defined in option page_on_front or post_for_posts,
+	 	 * adjust the corresponding options.
+	 	 */
 		if ( get_option( 'page_on_front' ) == $post->ID ) {
 			update_option( 'show_on_front', 'posts' );
 			update_option( 'page_on_front', 0 );
 		}
 		if ( get_option( 'page_for_posts' ) == $post->ID ) {
 			delete_option( 'page_for_posts', 0 );
 		}
 	}
 	unstick_post( $post->ID );
 }
-add_action( 'before_delete_post', '_reset_front_page_settings_for_post' );
-add_action( 'wp_trash_post',      '_reset_front_page_settings_for_post' );
+/**
+* Move a post or page to the Trash
-/**
-* Moves a post or page to the Trash
 *
 * If trash is disabled, the post or page is permanently deleted.
 *
 * @since 2.9.0
-* @uses do_action() on 'trash_post' before trashing
+*
-* @uses do_action() on 'trashed_post' after trashing
+* @see wp_delete_post()
-* @uses wp_delete_post() if trash is disabled
+*
-*
+* @param int $post_id Optional. Post ID. Default is ID of the global $post
-* @param int $post_id Post ID.
+*                     if EMPTY_TRASH_DAYS equals true.
-* @return mixed False on failure
+* @return bool|array Post data array, otherwise false.
 */
-function wp_trash_post($post_id = 0) {
+function wp_trash_post( $post_id = 0 ) {
 	if ( !EMPTY_TRASH_DAYS )
 		return wp_delete_post($post_id, true);
 	if ( !$post = get_post($post_id, ARRAY_A) )
 		return $post;
 	if ( $post['post_status'] == 'trash' )
 		return false;
-	do_action('wp_trash_post', $post_id);
+	/**
+	 * Fires before a post is sent to the trash.
+	 *
+	 * @since 3.3.0
+	 *
+	 * @param int $post_id Post ID.
+	 */
+	do_action( 'wp_trash_post', $post_id );
 	add_post_meta($post_id,'_wp_trash_meta_status', $post['post_status']);
 	add_post_meta($post_id,'_wp_trash_meta_time', time());
 	$post['post_status'] = 'trash';
 	wp_insert_post($post);
 	wp_trash_post_comments($post_id);
-	do_action('trashed_post', $post_id);
+	/**
+	 * Fires after a post is sent to the trash.
+	 *
+	 * @since 2.9.0
+	 *
+	 * @param int $post_id Post ID.
+	 */
+	do_action( 'trashed_post', $post_id );
 	return $post;
 }
 /**
-* Restores a post or page from the Trash
+* Restore a post or page from the Trash.
 *
 * @since 2.9.0
-* @uses do_action() on 'untrash_post' before undeletion
+*
-* @uses do_action() on 'untrashed_post' after undeletion
+* @param int $post_id Optional. Post ID. Default is ID of the global $post.
-*
+* @return WP_Post|bool WP_Post object. False on failure.
-* @param int $post_id Post ID.
+*/
-* @return mixed False on failure
+function wp_untrash_post( $post_id = 0 ) {
-*/
-function wp_untrash_post($post_id = 0) {
 	if ( !$post = get_post($post_id, ARRAY_A) )
 		return $post;
 	if ( $post['post_status'] != 'trash' )
 		return false;
-	do_action('untrash_post', $post_id);
+	/**
+	 * Fires before a post is restored from the trash.
+	 *
+	 * @since 2.9.0
+	 *
+	 * @param int $post_id Post ID.
+	 */
+	do_action( 'untrash_post', $post_id );
 	$post_status = get_post_meta($post_id, '_wp_trash_meta_status', true);
 	$post['post_status'] = $post_status;
 	wp_insert_post($post);
 	wp_untrash_post_comments($post_id);
-	do_action('untrashed_post', $post_id);
+	/**
+	 * Fires after a post is restored from the trash.
+	 *
+	 * @since 2.9.0
+	 *
+	 * @param int $post_id Post ID.
+	 */
+	do_action( 'untrashed_post', $post_id );
 	return $post;
 }
 /**
-* Moves comments for a post to the trash
+* Moves comments for a post to the trash.
 *
 * @since 2.9.0
-* @uses do_action() on 'trash_post_comments' before trashing
+*
-* @uses do_action() on 'trashed_post_comments' after trashing
+* @global wpdb $wpdb WordPress database abstraction object.
 *
-* @param int|object $post Post ID or object.
+* @param int|WP_Post $post Optional. Post ID or post object. Defaults to global $post.
-* @return mixed False on failure
+* @return mixed False on failure.
 */
-function wp_trash_post_comments($post = null) {
+function wp_trash_post_comments( $post = null ) {
 	global $wpdb;
 	$post = get_post($post);
 	if ( empty($post) )
 		return;
 	$post_id = $post->ID;
-	do_action('trash_post_comments', $post_id);
+	/**
+	 * Fires before comments are sent to the trash.
+	 *
+	 * @since 2.9.0
+	 *
+	 * @param int $post_id Post ID.
+	 */
+	do_action( 'trash_post_comments', $post_id );
 	$comments = $wpdb->get_results( $wpdb->prepare("SELECT comment_ID, comment_approved FROM $wpdb->comments WHERE comment_post_ID = %d", $post_id) );
 	if ( empty($comments) )
 		return;
-	// Cache current status for each comment
+	// Cache current status for each comment.
 	$statuses = array();
 	foreach ( $comments as $comment )
 		$statuses[$comment->comment_ID] = $comment->comment_approved;
 	add_post_meta($post_id, '_wp_trash_meta_comments_status', $statuses);
-	// Set status for all comments to post-trashed
+	// Set status for all comments to post-trashed.
 	$result = $wpdb->update($wpdb->comments, array('comment_approved' => 'post-trashed'), array('comment_post_ID' => $post_id));
 	clean_comment_cache( array_keys($statuses) );
-	do_action('trashed_post_comments', $post_id, $statuses);
+	/**
+	 * Fires after comments are sent to the trash.
+	 *
+	 * @since 2.9.0
+	 *
+	 * @param int   $post_id  Post ID.
+	 * @param array $statuses Array of comment statuses.
+	 */
+	do_action( 'trashed_post_comments', $post_id, $statuses );
 	return $result;
 }
 /**
-* Restore comments for a post from the trash
+* Restore comments for a post from the trash.
 *
 * @since 2.9.0
-* @uses do_action() on 'untrash_post_comments' before trashing
+*
-* @uses do_action() on 'untrashed_post_comments' after trashing
+* @param int|WP_Post $post Optional. Post ID or post object. Defaults to global $post.
-*
+* @return null|bool Null on failure.
-* @param int|object $post Post ID or object.
+*/
-* @return mixed False on failure
+function wp_untrash_post_comments( $post = null ) {
-*/
-function wp_untrash_post_comments($post = null) {
 	global $wpdb;
 	$post = get_post($post);
 	if ( empty($post) )
 		return;
 	$statuses = get_post_meta($post_id, '_wp_trash_meta_comments_status', true);
 	if ( empty($statuses) )
 		return true;
-	do_action('untrash_post_comments', $post_id);
+	/**
+	 * Fires before comments are restored for a post from the trash.
-	// Restore each comment to its original status
+	 *
+	 * @since 2.9.0
+	 *
+	 * @param int $post_id Post ID.
+	 */
+	do_action( 'untrash_post_comments', $post_id );
+	// Restore each comment to its original status.
 	$group_by_status = array();
 	foreach ( $statuses as $comment_id => $comment_status )
 		$group_by_status[$comment_status][] = $comment_id;
 	foreach ( $group_by_status as $status => $comments ) {
 	clean_comment_cache( array_keys($statuses) );
 	delete_post_meta($post_id, '_wp_trash_meta_comments_status');
-	do_action('untrashed_post_comments', $post_id);
+	/**
+	 * Fires after comments are restored for a post from the trash.
+	 *
+	 * @since 2.9.0
+	 *
+	 * @param int $post_id Post ID.
+	 */
+	do_action( 'untrashed_post_comments', $post_id );
 }
 /**
 * Retrieve the list of categories for a post.
 *
 * Compatibility layer for themes and plugins. Also an easy layer of abstraction
 * away from the complexity of the taxonomy layer.
 *
 * @since 2.1.0
 *
-* @uses wp_get_object_terms() Retrieves the categories. Args details can be found here.
+* @see wp_get_object_terms()
 *
-* @param int $post_id Optional. The Post ID.
+* @param int   $post_id Optional. The Post ID. Does not default to the ID of the
-* @param array $args Optional. Overwrite the defaults.
+*                       global $post. Default 0.
-* @return array
+* @param array $args    Optional. Category arguments. Default empty.
+* @return array List of categories.
 */
 function wp_get_post_categories( $post_id = 0, $args = array() ) {
 	$post_id = (int) $post_id;
 	$defaults = array('fields' => 'ids');
 *
 * There is only one default for this function, called 'fields' and by default
 * is set to 'all'. There are other defaults that can be overridden in
 * {@link wp_get_object_terms()}.
 *
-* @package WordPress
-* @subpackage Post
 * @since 2.3.0
 *
-* @uses wp_get_object_terms() Gets the tags for returning. Args can be found here
+* @param int   $post_id Optional. The Post ID. Does not default to the ID of the
-*
+*                       global $post. Defualt 0.
-* @param int $post_id Optional. The Post ID
 * @param array $args Optional. Overwrite the defaults
 * @return array List of post tags.
 */
 function wp_get_post_tags( $post_id = 0, $args = array() ) {
 	return wp_get_post_terms( $post_id, 'post_tag', $args);
 *
 * There is only one default for this function, called 'fields' and by default
 * is set to 'all'. There are other defaults that can be overridden in
 * {@link wp_get_object_terms()}.
 *
-* @package WordPress
-* @subpackage Post
 * @since 2.8.0
 *
-* @uses wp_get_object_terms() Gets the tags for returning. Args can be found here
+* @param int    $post_id  Optional. The Post ID. Does not default to the ID of the
-*
+*                         global $post. Default 0.
-* @param int $post_id Optional. The Post ID
+* @param string $taxonomy Optional. The taxonomy for which to retrieve terms. Default 'post_tag'.
-* @param string $taxonomy The taxonomy for which to retrieve terms. Defaults to post_tag.
+* @param array  $args     Optional. {@link wp_get_object_terms()} arguments. Default empty array.
-* @param array $args Optional. Overwrite the defaults
 * @return array List of post tags.
 */
 function wp_get_post_terms( $post_id = 0, $taxonomy = 'post_tag', $args = array() ) {
 	$post_id = (int) $post_id;
 	return $tags;
 }
 /**
-* Retrieve number of recent posts.
+* Retrieve a number of recent posts.
 *
 * @since 1.0.0
-* @uses wp_parse_args()
+*
-* @uses get_posts()
+* @see get_posts()
 *
-* @param string $deprecated Deprecated.
+* @param array  $args       Optional. Arguments to retrieve posts. Default empty array.
-* @param array $args Optional. Overrides defaults.
+* @param string $output     Optional. Type of output. Accepts ARRAY_A or ''. Default ARRAY_A.
-* @param string $output Optional.
+* @return array|bool Associative array if $output equals ARRAY_A, array or false if no results.
-* @return unknown.
 */
 function wp_get_recent_posts( $args = array(), $output = ARRAY_A ) {
 	if ( is_numeric( $args ) ) {
 		_deprecated_argument( __FUNCTION__, '3.1', __( 'Passing an integer number of posts is deprecated. Pass an array of arguments instead.' ) );
 		$args = array( 'numberposts' => absint( $args ) );
 	}
-	// Set default arguments
+	// Set default arguments.
 	$defaults = array(
 		'numberposts' => 10, 'offset' => 0,
 		'category' => 0, 'orderby' => 'post_date',
 		'order' => 'DESC', 'include' => '',
 		'exclude' => '', 'meta_key' => '',
 	$r = wp_parse_args( $args, $defaults );
 	$results = get_posts( $r );
-	// Backward compatibility. Prior to 3.1 expected posts to be returned in array
+	// Backward compatibility. Prior to 3.1 expected posts to be returned in array.
 	if ( ARRAY_A == $output ){
 		foreach( $results as $key => $result ) {
 			$results[$key] = get_object_vars( $result );
 		}
 		return $results ? $results : array();
 *
 * You can set the post date manually, by setting the values for 'post_date'
 * and 'post_date_gmt' keys. You can close the comments or open the comments by
 * setting the value for 'comment_status' key.
 *
-* @global wpdb $wpdb    WordPress database abstraction object.
-*
 * @since 1.0.0
+* @since 4.2.0 Support was added for encoding emoji in the post title, content, and excerpt.
+*
+* @see sanitize_post()
+* @global wpdb $wpdb WordPress database abstraction object.
 *
 * @param array $postarr {
 *     An array of elements that make up a post to update or insert.
 *
-*     @type int    'ID'                    The post ID. If equal to something other than 0, the post with that ID will
+*     @type int    $ID                    The post ID. If equal to something other than 0,
-*                                          be updated. Default 0.
+*                                         the post with that ID will be updated. Default 0.
-*     @type string 'post_status'           The post status. Default 'draft'.
+*     @type int    $post_author           The ID of the user who added the post. Default is
-*     @type string 'post_type'             The post type. Default 'post'.
+*                                         the current user ID.
-*     @type int    'post_author'           The ID of the user who added the post. Default the current user ID.
+*     @type string $post_date             The date of the post. Default is the current time.
-*     @type bool   'ping_status'           Whether the post can accept pings. Default value of 'default_ping_status' option.
+*     @type string $post_date_gmt         The date of the post in the GMT timezone. Default is
-*     @type int    'post_parent'           Set this for the post it belongs to, if any. Default 0.
+*                                         the value of `$post_date`.
-*     @type int    'menu_order'            The order it is displayed. Default 0.
+*     @type mixed  $post_content          The post content. Default empty.
-*     @type string 'to_ping'               Space or carriage return-separated list of URLs to ping. Default empty string.
+*     @type string $post_content_filtered The filtered post content. Default empty.
-*     @type string 'pinged'                Space or carriage return-separated list of URLs that have been pinged.
+*     @type string $post_title            The post title. Default empty.
-*                                          Default empty string.
+*     @type string $post_excerpt          The post excerpt. Default empty.
-*     @type string 'post_password          The password to access the post. Default empty string.
+*     @type string $post_status           The post status. Default 'draft'.
-*     @type string 'guid'                  Global Unique ID for referencing the post.
+*     @type string $post_type             The post type. Default 'post'.
-*     @type string 'post_content_filtered' The filtered post content. Default empty string.
+*     @type string $comment_status        Whether the post can accept comments. Accepts 'open' or 'closed'.
-*     @type string 'post_excerpt'          The post excerpt. Default empty string.
+*                                         Default is the value of 'default_comment_status' option.
+*     @type string $ping_status           Whether the post can accept pings. Accepts 'open' or 'closed'.
+*                                         Default is the value of 'default_ping_status' option.
+*     @type string $post_password         The password to access the post. Default empty.
+*     @type string $post_name             The post name. Default is the sanitized post title.
+*     @type string $to_ping               Space or carriage return-separated list of URLs to ping.
+*                                         Default empty.
+*     @type string $pinged                Space or carriage return-separated list of URLs that have
+*                                         been pinged. Default empty.
+*     @type string $post_modified         The date when the post was last modified. Default is
+*                                         the current time.
+*     @type string $post_modified_gmt     The date when the post was last modified in the GMT
+*                                         timezone. Default is the current time.
+*     @type int    $post_parent           Set this for the post it belongs to, if any. Default 0.
+*     @type int    $menu_order            The order the post should be displayed in. Default 0.
+*     @type string $post_mime_type        The mime type of the post. Default empty.
+*     @type string $guid                  Global Unique ID for referencing the post. Default empty.
 * }
-* @param bool  $wp_error Optional. Allow return of WP_Error on failure.
+* @param bool  $wp_error Optional. Whether to allow return of WP_Error on failure. Default false.
 * @return int|WP_Error The post ID on success. The value 0 or WP_Error on failure.
 */
 function wp_insert_post( $postarr, $wp_error = false ) {
 	global $wpdb;
 	$defaults = array('post_status' => 'draft', 'post_type' => 'post', 'post_author' => $user_id,
 		'ping_status' => get_option('default_ping_status'), 'post_parent' => 0,
 		'menu_order' => 0, 'to_ping' =>  '', 'pinged' => '', 'post_password' => '',
 		'guid' => '', 'post_content_filtered' => '', 'post_excerpt' => '', 'import_id' => 0,
-		'post_content' => '', 'post_title' => '');
+		'post_content' => '', 'post_title' => '', 'context' => '');
 	$postarr = wp_parse_args($postarr, $defaults);
 	unset( $postarr[ 'filter' ] );
 	$postarr = sanitize_post($postarr, 'db');
-	// export array as variables
-	extract($postarr, EXTR_SKIP);
 	// Are we updating or creating?
 	$post_ID = 0;
 	$update = false;
-	if ( ! empty( $ID ) ) {
+	$guid = $postarr['guid'];
+	if ( ! empty( $postarr['ID'] ) ) {
 		$update = true;
-		// Get the post ID and GUID
+		// Get the post ID and GUID.
-		$post_ID = $ID;
+		$post_ID = $postarr['ID'];
 		$post_before = get_post( $post_ID );
 		if ( is_null( $post_before ) ) {
-			if ( $wp_error )
+			if ( $wp_error ) {
 				return new WP_Error( 'invalid_post', __( 'Invalid post ID.' ) );
+			}
 			return 0;
 		}
 		$guid = get_post_field( 'guid', $post_ID );
-		$previous_status = get_post_field('post_status', $ID);
+		$previous_status = get_post_field('post_status', $post_ID );
 	} else {
 		$previous_status = 'new';
 	}
-	$maybe_empty = ! $post_content && ! $post_title && ! $post_excerpt && post_type_supports( $post_type, 'editor' )
+	$post_type = empty( $postarr['post_type'] ) ? 'post' : $postarr['post_type'];
-		&& post_type_supports( $post_type, 'title' ) && post_type_supports( $post_type, 'excerpt' );
+	$post_title = $postarr['post_title'];
+	$post_content = $postarr['post_content'];
+	$post_excerpt = $postarr['post_excerpt'];
+	if ( isset( $postarr['post_name'] ) ) {
+		$post_name = $postarr['post_name'];
+	}
+	$maybe_empty = 'attachment' !== $post_type
+		&& ! $post_content && ! $post_title && ! $post_excerpt
+		&& post_type_supports( $post_type, 'editor' )
+		&& post_type_supports( $post_type, 'title' )
+		&& post_type_supports( $post_type, 'excerpt' );
+	/**
+	 * Filter whether the post should be considered "empty".
+	 *
+	 * The post is considered "empty" if both:
+	 * 1. The post type supports the title, editor, and excerpt fields
+	 * 2. The title, editor, and excerpt fields are all empty
+	 *
+	 * Returning a truthy value to the filter will effectively short-circuit
+	 * the new post being inserted, returning 0. If $wp_error is true, a WP_Error
+	 * will be returned instead.
+	 *
+	 * @since 3.3.0
+	 *
+	 * @param bool  $maybe_empty Whether the post should be considered "empty".
+	 * @param array $postarr     Array of post data.
+	 */
 	if ( apply_filters( 'wp_insert_post_empty_content', $maybe_empty, $postarr ) ) {
-		if ( $wp_error )
+		if ( $wp_error ) {
 			return new WP_Error( 'empty_content', __( 'Content, title, and excerpt are empty.' ) );
-		else
+		} else {
 			return 0;
-	}
+		}
+	}
-	if ( empty($post_type) )
-		$post_type = 'post';
+	$post_status = empty( $postarr['post_status'] ) ? 'draft' : $postarr['post_status'];
+	if ( 'attachment' === $post_type && ! in_array( $post_status, array( 'inherit', 'private', 'trash' ) ) ) {
-	if ( empty($post_status) )
+		$post_status = 'inherit';
-		$post_status = 'draft';
+	}
-	if ( !empty($post_category) )
+	if ( ! empty( $postarr['post_category'] ) ) {
-		$post_category = array_filter($post_category); // Filter out empty terms
+		// Filter out empty terms.
+		$post_category = array_filter( $postarr['post_category'] );
+	}
 	// Make sure we set a valid category.
-	if ( empty($post_category) || 0 == count($post_category) || !is_array($post_category) ) {
+	if ( empty( $post_category ) || 0 == count( $post_category ) || ! is_array( $post_category ) ) {
 		// 'post' requires at least one category.
-		if ( 'post' == $post_type && 'auto-draft' != $post_status )
+		if ( 'post' == $post_type && 'auto-draft' != $post_status ) {
 			$post_category = array( get_option('default_category') );
-		else
+		} else {
 			$post_category = array();
-	}
+		}
+	}
-	if ( empty($post_author) )
-		$post_author = $user_id;
+	// Don't allow contributors to set the post slug for pending review posts.
+	if ( 'pending' == $post_status && !current_user_can( 'publish_posts' ) ) {
-	// Don't allow contributors to set the post slug for pending review posts
-	if ( 'pending' == $post_status && !current_user_can( 'publish_posts' ) )
 		$post_name = '';
+	}
-	// Create a valid post name. Drafts and pending posts are allowed to have an empty
-	// post name.
+	/*
+	 * Create a valid post name. Drafts and pending posts are allowed to have
+	 * an empty post name.
+	 */
 	if ( empty($post_name) ) {
-		if ( !in_array( $post_status, array( 'draft', 'pending', 'auto-draft' ) ) )
+		if ( !in_array( $post_status, array( 'draft', 'pending', 'auto-draft' ) ) ) {
 			$post_name = sanitize_title($post_title);
-		else
+		} else {
 			$post_name = '';
+		}
 	} else {
 		// On updates, we need to check to see if it's using the old, fixed sanitization context.
 		$check_name = sanitize_title( $post_name, '', 'old-save' );
-		if ( $update && strtolower( urlencode( $post_name ) ) == $check_name && get_post_field( 'post_name', $ID ) == $check_name )
+		if ( $update && strtolower( urlencode( $post_name ) ) == $check_name && get_post_field( 'post_name', $post_ID ) == $check_name ) {
 			$post_name = $check_name;
-		else // new post, or slug has changed.
+		} else { // new post, or slug has changed.
 			$post_name = sanitize_title($post_name);
-	}
+		}
+	}
-	// If the post date is empty (due to having been new or a draft) and status is not 'draft' or 'pending', set date to now
-	if ( empty($post_date) || '0000-00-00 00:00:00' == $post_date )
+	/*
-		$post_date = current_time('mysql');
+	 * If the post date is empty (due to having been new or a draft) and status
+	 * is not 'draft' or 'pending', set date to now.
-		// validate the date
+	 */
-		$mm = substr( $post_date, 5, 2 );
+	if ( empty( $postarr['post_date'] ) || '0000-00-00 00:00:00' == $postarr['post_date'] ) {
-		$jj = substr( $post_date, 8, 2 );
+		$post_date = current_time( 'mysql' );
-		$aa = substr( $post_date, 0, 4 );
+	} else {
-		$valid_date = wp_checkdate( $mm, $jj, $aa, $post_date );
+		$post_date = $postarr['post_date'];
-		if ( !$valid_date ) {
+	}
-			if ( $wp_error )
-				return new WP_Error( 'invalid_date', __( 'Whoops, the provided date is invalid.' ) );
+	// Validate the date.
-			else
+	$mm = substr( $post_date, 5, 2 );
-				return 0;
+	$jj = substr( $post_date, 8, 2 );
-		}
+	$aa = substr( $post_date, 0, 4 );
+	$valid_date = wp_checkdate( $mm, $jj, $aa, $post_date );
-	if ( empty($post_date_gmt) || '0000-00-00 00:00:00' == $post_date_gmt ) {
+	if ( ! $valid_date ) {
-		if ( !in_array( $post_status, array( 'draft', 'pending', 'auto-draft' ) ) )
+		if ( $wp_error ) {
-			$post_date_gmt = get_gmt_from_date($post_date);
+			return new WP_Error( 'invalid_date', __( 'Whoops, the provided date is invalid.' ) );
-		else
+		} else {
+			return 0;
+		}
+	}
+	if ( empty( $postarr['post_date_gmt'] ) || '0000-00-00 00:00:00' == $postarr['post_date_gmt'] ) {
+		if ( ! in_array( $post_status, array( 'draft', 'pending', 'auto-draft' ) ) ) {
+			$post_date_gmt = get_gmt_from_date( $post_date );
+		} else {
 			$post_date_gmt = '0000-00-00 00:00:00';
+		}
+	} else {
+		$post_date_gmt = $postarr['post_date_gmt'];
 	}
 	if ( $update || '0000-00-00 00:00:00' == $post_date ) {
 		$post_modified     = current_time( 'mysql' );
 		$post_modified_gmt = current_time( 'mysql', 1 );
 	} else {
 		$post_modified     = $post_date;
 		$post_modified_gmt = $post_date_gmt;
 	}
-	if ( 'publish' == $post_status ) {
+	if ( 'attachment' !== $post_type ) {
-		$now = gmdate('Y-m-d H:i:59');
+		if ( 'publish' == $post_status ) {
-		if ( mysql2date('U', $post_date_gmt, false) > mysql2date('U', $now, false) )
+			$now = gmdate('Y-m-d H:i:59');
-			$post_status = 'future';
+			if ( mysql2date('U', $post_date_gmt, false) > mysql2date('U', $now, false) ) {
-	} elseif( 'future' == $post_status ) {
+				$post_status = 'future';
-		$now = gmdate('Y-m-d H:i:59');
+			}
-		if ( mysql2date('U', $post_date_gmt, false) <= mysql2date('U', $now, false) )
+		} elseif( 'future' == $post_status ) {
-			$post_status = 'publish';
+			$now = gmdate('Y-m-d H:i:59');
-	}
+			if ( mysql2date('U', $post_date_gmt, false) <= mysql2date('U', $now, false) ) {
+				$post_status = 'publish';
-	if ( empty($comment_status) ) {
+			}
-		if ( $update )
+		}
+	}
+	if ( empty( $postarr['comment_status'] ) ) {
+		if ( $update ) {
 			$comment_status = 'closed';
-		else
+		} else {
 			$comment_status = get_option('default_comment_status');
-	}
+		}
-	if ( empty($ping_status) )
+	} else {
-		$ping_status = get_option('default_ping_status');
+		$comment_status = $postarr['comment_status'];
+	}
-	if ( isset($to_ping) )
-		$to_ping = sanitize_trackback_urls( $to_ping );
+	// These variables are needed by compact() later.
-	else
+	$post_content_filtered = $postarr['post_content_filtered'];
-		$to_ping = '';
+	$post_author = empty( $postarr['post_author'] ) ? $user_id : $postarr['post_author'];
+	$ping_status = empty( $postarr['ping_status'] ) ? get_option( 'default_ping_status' ) : $postarr['ping_status'];
-	if ( ! isset($pinged) )
+	$to_ping = isset( $postarr['to_ping'] ) ? sanitize_trackback_urls( $postarr['to_ping'] ) : '';
-		$pinged = '';
+	$pinged = isset( $postarr['pinged'] ) ? $postarr['pinged'] : '';
+	$import_id = isset( $postarr['import_id'] ) ? $postarr['import_id'] : 0;
-	if ( isset($post_parent) )
-		$post_parent = (int) $post_parent;
+	/*
-	else
+	 * The 'wp_insert_post_parent' filter expects all variables to be present.
+	 * Previously, these variables would have already been extracted
+	 */
+	if ( isset( $postarr['menu_order'] ) ) {
+		$menu_order = (int) $postarr['menu_order'];
+	} else {
+		$menu_order = 0;
+	}
+	$post_password = isset( $postarr['post_password'] ) ? $postarr['post_password'] : '';
+	if ( 'private' == $post_status ) {
+		$post_password = '';
+	}
+	if ( isset( $postarr['post_parent'] ) ) {
+		$post_parent = (int) $postarr['post_parent'];
+	} else {
 		$post_parent = 0;
+	}
-	// Check the post_parent to see if it will cause a hierarchy loop
+	/**
+	 * Filter the post parent -- used to check for and prevent hierarchy loops.
+	 *
+	 * @since 3.1.0
+	 *
+	 * @param int   $post_parent Post parent ID.
+	 * @param int   $post_ID     Post ID.
+	 * @param array $new_postarr Array of parsed post data.
+	 * @param array $postarr     Array of sanitized, but otherwise unmodified post data.
+	 */
 	$post_parent = apply_filters( 'wp_insert_post_parent', $post_parent, $post_ID, compact( array_keys( $postarr ) ), $postarr );
-	if ( isset($menu_order) )
+	$post_name = wp_unique_post_slug( $post_name, $post_ID, $post_status, $post_type, $post_parent );
-		$menu_order = (int) $menu_order;
-	else
+	// Don't unslash.
-		$menu_order = 0;
+	$post_mime_type = isset( $postarr['post_mime_type'] ) ? $postarr['post_mime_type'] : '';
-	if ( !isset($post_password) || 'private' == $post_status )
+	// Expected_slashed (everything!).
-		$post_password = '';
+	$data = compact( 'post_author', 'post_date', 'post_date_gmt', 'post_content', 'post_content_filtered', 'post_title', 'post_excerpt', 'post_status', 'post_type', 'comment_status', 'ping_status', 'post_password', 'post_name', 'to_ping', 'pinged', 'post_modified', 'post_modified_gmt', 'post_parent', 'menu_order', 'post_mime_type', 'guid' );
-	$post_name = wp_unique_post_slug($post_name, $post_ID, $post_status, $post_type, $post_parent);
+	$emoji_fields = array( 'post_title', 'post_content', 'post_excerpt' );
-	// expected_slashed (everything!)
+	foreach( $emoji_fields as $emoji_field ) {
-	$data = compact( array( 'post_author', 'post_date', 'post_date_gmt', 'post_content', 'post_content_filtered', 'post_title', 'post_excerpt', 'post_status', 'post_type', 'comment_status', 'ping_status', 'post_password', 'post_name', 'to_ping', 'pinged', 'post_modified', 'post_modified_gmt', 'post_parent', 'menu_order', 'guid' ) );
+		if ( isset( $data[ $emoji_field ] ) ) {
-	$data = apply_filters('wp_insert_post_data', $data, $postarr);
+			$charset = $wpdb->get_col_charset( $wpdb->posts, $emoji_field );
+			if ( 'utf8' === $charset ) {
+				$data[ $emoji_field ] = wp_encode_emoji( $data[ $emoji_field ] );
+			}
+		}
+	}
+	if ( 'attachment' === $post_type ) {
+		/**
+		 * Filter attachment post data before it is updated in or added to the database.
+		 *
+		 * @since 3.9.0
+		 *
+		 * @param array $data    An array of sanitized attachment post data.
+		 * @param array $postarr An array of unsanitized attachment post data.
+		 */
+		$data = apply_filters( 'wp_insert_attachment_data', $data, $postarr );
+	} else {
+		/**
+		 * Filter slashed post data just before it is inserted into the database.
+		 *
+		 * @since 2.7.0
+		 *
+		 * @param array $data    An array of slashed post data.
+		 * @param array $postarr An array of sanitized, but otherwise unmodified post data.
+		 */
+		$data = apply_filters( 'wp_insert_post_data', $data, $postarr );
+	}
 	$data = wp_unslash( $data );
 	$where = array( 'ID' => $post_ID );
 	if ( $update ) {
+		/**
+		 * Fires immediately before an existing post is updated in the database.
+		 *
+		 * @since 2.5.0
+		 *
+		 * @param int   $post_ID Post ID.
+		 * @param array $data    Array of unslashed post data.
+		 */
 		do_action( 'pre_post_update', $post_ID, $data );
 		if ( false === $wpdb->update( $wpdb->posts, $data, $where ) ) {
-			if ( $wp_error )
+			if ( $wp_error ) {
 				return new WP_Error('db_update_error', __('Could not update post in the database'), $wpdb->last_error);
-			else
+			} else {
 				return 0;
+			}
 		}
 	} else {
-		if ( isset($post_mime_type) )
+		// If there is a suggested ID, use it if not already present.
-			$data['post_mime_type'] = wp_unslash( $post_mime_type ); // This isn't in the update
+		if ( ! empty( $import_id ) ) {
-		// If there is a suggested ID, use it if not already present
-		if ( !empty($import_id) ) {
 			$import_id = (int) $import_id;
 			if ( ! $wpdb->get_var( $wpdb->prepare("SELECT ID FROM $wpdb->posts WHERE ID = %d", $import_id) ) ) {
 				$data['ID'] = $import_id;
 			}
 		}
 		if ( false === $wpdb->insert( $wpdb->posts, $data ) ) {
-			if ( $wp_error )
+			if ( $wp_error ) {
 				return new WP_Error('db_insert_error', __('Could not insert post into the database'), $wpdb->last_error);
-			else
+			} else {
 				return 0;
+			}
 		}
 		$post_ID = (int) $wpdb->insert_id;
-		// use the newly generated $post_ID
+		// Use the newly generated $post_ID.
 		$where = array( 'ID' => $post_ID );
 	}
-	if ( empty($data['post_name']) && !in_array( $data['post_status'], array( 'draft', 'pending', 'auto-draft' ) ) ) {
+	if ( empty( $data['post_name'] ) && ! in_array( $data['post_status'], array( 'draft', 'pending', 'auto-draft' ) ) ) {
-		$data['post_name'] = sanitize_title($data['post_title'], $post_ID);
+		$data['post_name'] = sanitize_title( $data['post_title'], $post_ID );
 		$wpdb->update( $wpdb->posts, array( 'post_name' => $data['post_name'] ), $where );
 	}
-	if ( is_object_in_taxonomy($post_type, 'category') )
+	if ( is_object_in_taxonomy( $post_type, 'category' ) ) {
 		wp_set_post_categories( $post_ID, $post_category );
+	}
-	if ( isset( $tags_input ) && is_object_in_taxonomy($post_type, 'post_tag') )
-		wp_set_post_tags( $post_ID, $tags_input );
+	if ( isset( $postarr['tags_input'] ) && is_object_in_taxonomy( $post_type, 'post_tag' ) ) {
+		wp_set_post_tags( $post_ID, $postarr['tags_input'] );
-	// new-style support for all custom taxonomies
+	}
-	if ( !empty($tax_input) ) {
-		foreach ( $tax_input as $taxonomy => $tags ) {
+	// New-style support for all custom taxonomies.
+	if ( ! empty( $postarr['tax_input'] ) ) {
+		foreach ( $postarr['tax_input'] as $taxonomy => $tags ) {
 			$taxonomy_obj = get_taxonomy($taxonomy);
-			if ( is_array($tags) ) // array = hierarchical, string = non-hierarchical.
+			// array = hierarchical, string = non-hierarchical.
+			if ( is_array( $tags ) ) {
 				$tags = array_filter($tags);
-			if ( current_user_can($taxonomy_obj->cap->assign_terms) )
+			}
+			if ( current_user_can( $taxonomy_obj->cap->assign_terms ) ) {
 				wp_set_post_terms( $post_ID, $tags, $taxonomy );
+			}
 		}
 	}
 	$current_guid = get_post_field( 'guid', $post_ID );
-	// Set GUID
+	// Set GUID.
-	if ( !$update && '' == $current_guid )
+	if ( ! $update && '' == $current_guid ) {
 		$wpdb->update( $wpdb->posts, array( 'guid' => get_permalink( $post_ID ) ), $where );
+	}
+	if ( 'attachment' === $postarr['post_type'] ) {
+		if ( ! empty( $postarr['file'] ) ) {
+			update_attached_file( $post_ID, $postarr['file'] );
+		}
+		if ( ! empty( $postarr['context'] ) ) {
+			add_post_meta( $post_ID, '_wp_attachment_context', $postarr['context'], true );
+		}
+	}
 	clean_post_cache( $post_ID );
-	$post = get_post($post_ID);
+	$post = get_post( $post_ID );
-	if ( !empty($page_template) && 'page' == $data['post_type'] ) {
+	if ( ! empty( $postarr['page_template'] ) && 'page' == $data['post_type'] ) {
-		$post->page_template = $page_template;
+		$post->page_template = $postarr['page_template'];
-		$page_templates = wp_get_theme()->get_page_templates();
+		$page_templates = wp_get_theme()->get_page_templates( $post );
-		if ( 'default' != $page_template && ! isset( $page_templates[ $page_template ] ) ) {
+		if ( 'default' != $postarr['page_template'] && ! isset( $page_templates[ $postarr['page_template'] ] ) ) {
-			if ( $wp_error )
+			if ( $wp_error ) {
 				return new WP_Error('invalid_page_template', __('The page template is invalid.'));
-			else
+			}
-				return 0;
+			update_post_meta( $post_ID, '_wp_page_template', 'default' );
-		}
+		} else {
-		update_post_meta($post_ID, '_wp_page_template',  $page_template);
+			update_post_meta( $post_ID, '_wp_page_template', $postarr['page_template'] );
-	}
+		}
+	}
-	wp_transition_post_status($data['post_status'], $previous_status, $post);
+	if ( 'attachment' !== $postarr['post_type'] ) {
+		wp_transition_post_status( $data['post_status'], $previous_status, $post );
+	} else {
+		if ( $update ) {
+			/**
+			 * Fires once an existing attachment has been updated.
+			 *
+			 * @since 2.0.0
+			 *
+			 * @param int $post_ID Attachment ID.
+			 */
+			do_action( 'edit_attachment', $post_ID );
+		} else {
+			/**
+			 * Fires once an attachment has been added.
+			 *
+			 * @since 2.0.0
+			 *
+			 * @param int $post_ID Attachment ID.
+			 */
+			do_action( 'add_attachment', $post_ID );
+		}
+		return $post_ID;
+	}
 	if ( $update ) {
-		do_action('edit_post', $post_ID, $post);
+		/**
+		 * Fires once an existing post has been updated.
+		 *
+		 * @since 1.2.0
+		 *
+		 * @param int     $post_ID Post ID.
+		 * @param WP_Post $post    Post object.
+		 */
+		do_action( 'edit_post', $post_ID, $post );
 		$post_after = get_post($post_ID);
+		/**
+		 * Fires once an existing post has been updated.
+		 *
+		 * @since 3.0.0
+		 *
+		 * @param int     $post_ID      Post ID.
+		 * @param WP_Post $post_after   Post object following the update.
+		 * @param WP_Post $post_before  Post object before the update.
+		 */
 		do_action( 'post_updated', $post_ID, $post_after, $post_before);
 	}
+	/**
+	 * Fires once a post has been saved.
+	 *
+	 * The dynamic portion of the hook name, `$post->post_type`, refers to
+	 * the post type slug.
+	 *
+	 * @since 3.7.0
+	 *
+	 * @param int     $post_ID Post ID.
+	 * @param WP_Post $post    Post object.
+	 * @param bool    $update  Whether this is an existing post being updated or not.
+	 */
 	do_action( "save_post_{$post->post_type}", $post_ID, $post, $update );
+	/**
+	 * Fires once a post has been saved.
+	 *
+	 * @since 1.5.0
+	 *
+	 * @param int     $post_ID Post ID.
+	 * @param WP_Post $post    Post object.
+	 * @param bool    $update  Whether this is an existing post being updated or not.
+	 */
 	do_action( 'save_post', $post_ID, $post, $update );
+	/**
+	 * Fires once a post has been saved.
+	 *
+	 * @since 2.0.0
+	 *
+	 * @param int     $post_ID Post ID.
+	 * @param WP_Post $post    Post object.
+	 * @param bool    $update  Whether this is an existing post being updated or not.
+	 */
 	do_action( 'wp_insert_post', $post_ID, $post, $update );
 	return $post_ID;
 }
 * The date does not have to be set for drafts. You can set the date and it will
 * not be overridden.
 *
 * @since 1.0.0
 *
-* @param array|object $postarr Post data. Arrays are expected to be escaped, objects are not.
+* @param array|object $postarr  Optional. Post data. Arrays are expected to be escaped,
-* @param bool $wp_error Optional. Allow return of WP_Error on failure.
+*                               objects are not. Default array.
+* @param bool         $wp_error Optional. Allow return of WP_Error on failure. Default false.
 * @return int|WP_Error The value 0 or WP_Error on failure. The post ID on success.
 */
 function wp_update_post( $postarr = array(), $wp_error = false ) {
 	if ( is_object($postarr) ) {
-		// non-escaped post was passed
+		// Non-escaped post was passed.
 		$postarr = get_object_vars($postarr);
 		$postarr = wp_slash($postarr);
 	}
-	// First, get all of the original fields
+	// First, get all of the original fields.
 	$post = get_post($postarr['ID'], ARRAY_A);
 	if ( is_null( $post ) ) {
 		if ( $wp_error )
 			return new WP_Error( 'invalid_post', __( 'Invalid post ID.' ) );
 			 && 0 != count($postarr['post_category']) )
 		$post_cats = $postarr['post_category'];
 	else
 		$post_cats = $post['post_category'];
-	// Drafts shouldn't be assigned a date unless explicitly done so by the user
+	// Drafts shouldn't be assigned a date unless explicitly done so by the user.
 	if ( isset( $post['post_status'] ) && in_array($post['post_status'], array('draft', 'pending', 'auto-draft')) && empty($postarr['edit_date']) &&
 			 ('0000-00-00 00:00:00' == $post['post_date_gmt']) )
 		$clear_date = true;
 	else
 		$clear_date = false;
 /**
 * Publish a post by transitioning the post status.
 *
 * @since 2.1.0
-* @uses $wpdb
+*
-* @uses do_action() Calls 'edit_post', 'save_post_{$post_type}', 'save_post' and 'wp_insert_post' on post_id and post data.
+* @global wpdb $wpdb WordPress database abstraction object.
 *
-* @param int|object $post Post ID or object.
+* @param int|WP_Post $post Post ID or post object.
 */
 function wp_publish_post( $post ) {
 	global $wpdb;
 	if ( ! $post = get_post( $post ) )
 	$old_status = $post->post_status;
 	$post->post_status = 'publish';
 	wp_transition_post_status( 'publish', $old_status, $post );
+	/** This action is documented in wp-includes/post.php */
 	do_action( 'edit_post', $post->ID, $post );
+	/** This action is documented in wp-includes/post.php */
 	do_action( "save_post_{$post->post_type}", $post->ID, $post, true );
+	/** This action is documented in wp-includes/post.php */
 	do_action( 'save_post', $post->ID, $post, true );
+	/** This action is documented in wp-includes/post.php */
 	do_action( 'wp_insert_post', $post->ID, $post, true );
 }
 /**
 * Publish future post and make sure post ID has future post status.
 * Invoked by cron 'publish_future_post' event. This safeguard prevents cron
 * from publishing drafts, etc.
 *
 * @since 2.5.0
 *
-* @param int $post_id Post ID.
+* @param int|WP_Post $post_id Post ID or post object.
-* @return null Nothing is returned. Which can mean that no action is required or post was published.
+* @return null Nothing is returned. Which can mean that no action is required
-*/
+*              or post was published.
-function check_and_publish_future_post($post_id) {
+*/
+function check_and_publish_future_post( $post_id ) {
 	$post = get_post($post_id);
 	if ( empty($post) )
 		return;
 	if ( 'future' != $post->post_status )
 		return;
 	$time = strtotime( $post->post_date_gmt . ' GMT' );
-	if ( $time > time() ) { // Uh oh, someone jumped the gun!
+	// Uh oh, someone jumped the gun!
+	if ( $time > time() ) {
 		wp_clear_scheduled_hook( 'publish_future_post', array( $post_id ) ); // clear anything else in the system
 		wp_schedule_single_event( $time, 'publish_future_post', array( $post_id ) );
 		return;
 	}
 /**
 * Computes a unique slug for the post, when given the desired slug and some post details.
 *
 * @since 2.8.0
 *
-* @global wpdb $wpdb
+* @global wpdb $wpdb WordPress database abstraction object.
 * @global WP_Rewrite $wp_rewrite
-* @param string $slug the desired slug (post_name)
+*
-* @param integer $post_ID
+* @param string $slug        The desired slug (post_name).
-* @param string $post_status no uniqueness checks are made if the post is still draft or pending
+* @param int    $post_ID     Post ID.
-* @param string $post_type
+* @param string $post_status No uniqueness checks are made if the post is still draft or pending.
-* @param integer $post_parent
+* @param string $post_type   Post type.
-* @return string unique slug for the post, based on $post_name (with a -1, -2, etc. suffix)
+* @param int    $post_parent Post parent ID.
+* @return string Unique slug for the post, based on $post_name (with a -1, -2, etc. suffix)
 */
 function wp_unique_post_slug( $slug, $post_ID, $post_status, $post_type, $post_parent ) {
 	if ( in_array( $post_status, array( 'draft', 'pending', 'auto-draft' ) ) || ( 'inherit' == $post_status && 'revision' == $post_type ) )
 		return $slug;
 	$feeds = $wp_rewrite->feeds;
 	if ( ! is_array( $feeds ) )
 		$feeds = array();
-	$hierarchical_post_types = get_post_types( array('hierarchical' => true) );
 	if ( 'attachment' == $post_type ) {
 		// Attachment slugs must be unique across all types.
 		$check_sql = "SELECT post_name FROM $wpdb->posts WHERE post_name = %s AND ID != %d LIMIT 1";
 		$post_name_check = $wpdb->get_var( $wpdb->prepare( $check_sql, $slug, $post_ID ) );
+		/**
+		 * Filter whether the post slug would make a bad attachment slug.
+		 *
+		 * @since 3.1.0
+		 *
+		 * @param bool   $bad_slug Whether the slug would be bad as an attachment slug.
+		 * @param string $slug     The post slug.
+		 */
 		if ( $post_name_check || in_array( $slug, $feeds ) || apply_filters( 'wp_unique_post_slug_is_bad_attachment_slug', false, $slug ) ) {
 			$suffix = 2;
 			do {
 				$alt_post_name = _truncate_post_slug( $slug, 200 - ( strlen( $suffix ) + 1 ) ) . "-$suffix";
 				$post_name_check = $wpdb->get_var( $wpdb->prepare( $check_sql, $alt_post_name, $post_ID ) );
 				$suffix++;
 			} while ( $post_name_check );
 			$slug = $alt_post_name;
 		}
-	} elseif ( in_array( $post_type, $hierarchical_post_types ) ) {
+	} elseif ( is_post_type_hierarchical( $post_type ) ) {
 		if ( 'nav_menu_item' == $post_type )
 			return $slug;
-		// Page slugs must be unique within their own trees. Pages are in a separate
-		// namespace than posts so page slugs are allowed to overlap post slugs.
+		/*
-		$check_sql = "SELECT post_name FROM $wpdb->posts WHERE post_name = %s AND post_type IN ( '" . implode( "', '", esc_sql( $hierarchical_post_types ) ) . "' ) AND ID != %d AND post_parent = %d LIMIT 1";
+		 * Page slugs must be unique within their own trees. Pages are in a separate
-		$post_name_check = $wpdb->get_var( $wpdb->prepare( $check_sql, $slug, $post_ID, $post_parent ) );
+		 * namespace than posts so page slugs are allowed to overlap post slugs.
+		 */
+		$check_sql = "SELECT post_name FROM $wpdb->posts WHERE post_name = %s AND post_type IN ( %s, 'attachment' ) AND ID != %d AND post_parent = %d LIMIT 1";
+		$post_name_check = $wpdb->get_var( $wpdb->prepare( $check_sql, $slug, $post_type, $post_ID, $post_parent ) );
+		/**
+		 * Filter whether the post slug would make a bad hierarchical post slug.
+		 *
+		 * @since 3.1.0
+		 *
+		 * @param bool   $bad_slug    Whether the post slug would be bad in a hierarchical post context.
+		 * @param string $slug        The post slug.
+		 * @param string $post_type   Post type.
+		 * @param int    $post_parent Post parent ID.
+		 */
 		if ( $post_name_check || in_array( $slug, $feeds ) || preg_match( "@^($wp_rewrite->pagination_base)?\d+$@", $slug )  || apply_filters( 'wp_unique_post_slug_is_bad_hierarchical_slug', false, $slug, $post_type, $post_parent ) ) {
 			$suffix = 2;
 			do {
 				$alt_post_name = _truncate_post_slug( $slug, 200 - ( strlen( $suffix ) + 1 ) ) . "-$suffix";
-				$post_name_check = $wpdb->get_var( $wpdb->prepare( $check_sql, $alt_post_name, $post_ID, $post_parent ) );
+				$post_name_check = $wpdb->get_var( $wpdb->prepare( $check_sql, $alt_post_name, $post_type, $post_ID, $post_parent ) );
 				$suffix++;
 			} while ( $post_name_check );
 			$slug = $alt_post_name;
 		}
 	} else {
 		// Post slugs must be unique across all posts.
 		$check_sql = "SELECT post_name FROM $wpdb->posts WHERE post_name = %s AND post_type = %s AND ID != %d LIMIT 1";
 		$post_name_check = $wpdb->get_var( $wpdb->prepare( $check_sql, $slug, $post_type, $post_ID ) );
+		/**
+		 * Filter whether the post slug would be bad as a flat slug.
+		 *
+		 * @since 3.1.0
+		 *
+		 * @param bool   $bad_slug  Whether the post slug would be bad as a flat slug.
+		 * @param string $slug      The post slug.
+		 * @param string $post_type Post type.
+		 */
 		if ( $post_name_check || in_array( $slug, $feeds ) || apply_filters( 'wp_unique_post_slug_is_bad_flat_slug', false, $slug, $post_type ) ) {
 			$suffix = 2;
 			do {
 				$alt_post_name = _truncate_post_slug( $slug, 200 - ( strlen( $suffix ) + 1 ) ) . "-$suffix";
 				$post_name_check = $wpdb->get_var( $wpdb->prepare( $check_sql, $alt_post_name, $post_type, $post_ID ) );
 			} while ( $post_name_check );
 			$slug = $alt_post_name;
 		}
 	}
+	/**
+	 * Filter the unique post slug.
+	 *
+	 * @since 3.3.0
+	 *
+	 * @param string $slug          The post slug.
+	 * @param int    $post_ID       Post ID.
+	 * @param string $post_status   The post status.
+	 * @param string $post_type     Post type.
+	 * @param int    $post_parent   Post parent ID
+	 * @param string $original_slug The original post slug.
+	 */
 	return apply_filters( 'wp_unique_post_slug', $slug, $post_ID, $post_status, $post_type, $post_parent, $original_slug );
 }
 /**
-* Truncates a post slug.
+* Truncate a post slug.
 *
 * @since 3.6.0
 * @access private
-* @uses utf8_uri_encode() Makes sure UTF-8 characters are properly cut and encoded.
+*
-*
+* @see utf8_uri_encode()
-* @param string $slug The slug to truncate.
+*
-* @param int $length Max length of the slug.
+* @param string $slug   The slug to truncate.
+* @param int    $length Optional. Max length of the slug. Default 200 (characters).
 * @return string The truncated slug.
 */
 function _truncate_post_slug( $slug, $length = 200 ) {
 	if ( strlen( $slug ) > $length ) {
 		$decoded_slug = urldecode( $slug );
 	return rtrim( $slug, '-' );
 }
 /**
-* Adds tags to a post.
+* Add tags to a post.
 *
-* @uses wp_set_post_tags() Same first two parameters, but the last parameter is always set to true.
+* @see wp_set_post_tags()
 *
-* @package WordPress
-* @subpackage Post
 * @since 2.3.0
 *
-* @param int $post_id Post ID
+* @param int    $post_id Optional. The Post ID. Does not default to the ID of the global $post.
-* @param string $tags The tags to set for the post, separated by commas.
+*                        Default 0.
-* @return bool|null Will return false if $post_id is not an integer or is 0. Will return null otherwise
+* @param string $tags    Optional. The tags to set for the post, separated by commas. Default empty.
-*/
+* @return bool|null Will return false if $post_id is not an integer or is 0. Will return null otherwise.
-function wp_add_post_tags($post_id = 0, $tags = '') {
+*/
+function wp_add_post_tags( $post_id = 0, $tags = '' ) {
 	return wp_set_post_tags($post_id, $tags, true);
 }
 /**
 * Set the tags for a post.
 *
 * @since 2.3.0
-* @uses wp_set_object_terms() Sets the tags for the post.
+*
-*
+* @see wp_set_object_terms()
-* @param int $post_id Post ID.
+*
-* @param string $tags The tags to set for the post, separated by commas.
+* @param int    $post_id Optional. The Post ID. Does not default to the ID of the global $post.
-* @param bool $append If true, don't delete existing tags, just add on. If false, replace the tags with the new tags.
+* @param string $tags    Optional. The tags to set for the post, separated by commas.
+*                        Default empty.
+* @param bool   $append  Optional. If true, don't delete existing tags, just add on. If false,
+*                        replace the tags with the new tags. Default false.
 * @return mixed Array of affected term IDs. WP_Error or false on failure.
 */
 function wp_set_post_tags( $post_id = 0, $tags = '', $append = false ) {
 	return wp_set_post_terms( $post_id, $tags, 'post_tag', $append);
 }
 /**
 * Set the terms for a post.
 *
 * @since 2.8.0
-* @uses wp_set_object_terms() Sets the tags for the post.
+*
-*
+* @see wp_set_object_terms()
-* @param int $post_id Post ID.
+*
-* @param string $tags The tags to set for the post, separated by commas.
+* @param int    $post_id  Optional. The Post ID. Does not default to the ID of the global $post.
-* @param string $taxonomy Taxonomy name. Defaults to 'post_tag'.
+* @param string $tags     Optional. The tags to set for the post, separated by commas. Default empty.
-* @param bool $append If true, don't delete existing tags, just add on. If false, replace the tags with the new tags.
+* @param string $taxonomy Optional. Taxonomy name. Default 'post_tag'.
+* @param bool   $append   Optional. If true, don't delete existing tags, just add on. If false,
+*                         replace the tags with the new tags. Default false.
 * @return mixed Array of affected term IDs. WP_Error or false on failure.
 */
 function wp_set_post_terms( $post_id = 0, $tags = '', $taxonomy = 'post_tag', $append = false ) {
 	$post_id = (int) $post_id;
 		if ( ',' !== $comma )
 			$tags = str_replace( $comma, ',', $tags );
 		$tags = explode( ',', trim( $tags, " \n\t\r\0\x0B," ) );
 	}
-	// Hierarchical taxonomies must always pass IDs rather than names so that children with the same
+	/*
-	// names but different parents aren't confused.
+	 * Hierarchical taxonomies must always pass IDs rather than names so that
+	 * children with the same names but different parents aren't confused.
+	 */
 	if ( is_taxonomy_hierarchical( $taxonomy ) ) {
 		$tags = array_unique( array_map( 'intval', $tags ) );
 	}
 	return wp_set_object_terms( $post_id, $tags, $taxonomy, $append );
 * If the post categories parameter is not set, then the default category is
 * going used.
 *
 * @since 2.1.0
 *
-* @param int $post_ID Post ID.
+* @param int       $post_ID         Optional. The Post ID. Does not default to the ID
+*                                   of the global $post. Default 0.
 * @param array|int $post_categories Optional. List of categories or ID of category.
-* @param bool $append If true, don't delete existing categories, just add on. If false, replace the categories with the new categories.
+*                                   Default empty array.
+* @param bool      $append         If true, don't delete existing categories, just add on.
+*                                  If false, replace the categories with the new categories.
 * @return bool|mixed
 */
 function wp_set_post_categories( $post_ID = 0, $post_categories = array(), $append = false ) {
 	$post_ID = (int) $post_ID;
 	$post_type = get_post_type( $post_ID );
 			$post_categories = array( get_option('default_category') );
 			$append = false;
 		} else {
 			$post_categories = array();
 		}
-	} else if ( 1 == count($post_categories) && '' == reset($post_categories) ) {
+	} elseif ( 1 == count( $post_categories ) && '' == reset( $post_categories ) ) {
 		return true;
 	}
 	return wp_set_post_terms( $post_ID, $post_categories, 'category', $append );
 }
 /**
 * Transition the post status of a post.
 *
-* Calls hooks to transition post status.
+* When a post is saved, the post status is "transitioned" from one status to another,
-*
+* though this does not always mean the status has actually changed before and after
-* The first is 'transition_post_status' with new status, old status, and post data.
+* the save.
 *
-* The next action called is 'OLDSTATUS_to_NEWSTATUS' the 'NEWSTATUS' is the
+* For instance: When publishing a post for the first time, the post status may transition
-* $new_status parameter and the 'OLDSTATUS' is $old_status parameter; it has the
+* from 'draft' – or some other status – to 'publish'. However, if a post is already
-* post data.
+* published and is simply being updated, the "old" and "new" statuses may both be 'publish'
-*
+* before and after the transition.
-* The final action is named 'NEWSTATUS_POSTTYPE', 'NEWSTATUS' is from the $new_status
-* parameter and POSTTYPE is post_type post data.
 *
 * @since 2.3.0
-* @link http://codex.wordpress.org/Post_Status_Transitions
+*
-*
+* @param string  $new_status Transition to this post status.
-* @uses do_action() Calls 'transition_post_status' on $new_status, $old_status and
+* @param string  $old_status Previous post status.
-*  $post if there is a status change.
+* @param WP_Post $post Post data.
-* @uses do_action() Calls '{$old_status}_to_{$new_status}' on $post if there is a status change.
+*/
-* @uses do_action() Calls '{$new_status}_{$post->post_type}' on post ID and $post.
+function wp_transition_post_status( $new_status, $old_status, $post ) {
-*
+	/**
-* @param string $new_status Transition to this post status.
+	 * Fires when a post is transitioned from one status to another.
-* @param string $old_status Previous post status.
+	 *
-* @param object $post Post data.
+	 * @since 2.3.0
-*/
+	 *
-function wp_transition_post_status($new_status, $old_status, $post) {
+	 * @param string  $new_status New post status.
-	do_action('transition_post_status', $new_status, $old_status, $post);
+	 * @param string  $old_status Old post status.
-	do_action("{$old_status}_to_{$new_status}", $post);
+	 * @param WP_Post $post       Post object.
-	do_action("{$new_status}_{$post->post_type}", $post->ID, $post);
+	 */
+	do_action( 'transition_post_status', $new_status, $old_status, $post );
+	/**
+	 * Fires when a post is transitioned from one status to another.
+	 *
+	 * The dynamic portions of the hook name, `$new_status` and `$old status`,
+	 * refer to the old and new post statuses, respectively.
+	 *
+	 * @since 2.3.0
+	 *
+	 * @param WP_Post $post Post object.
+	 */
+	do_action( "{$old_status}_to_{$new_status}", $post );
+	/**
+	 * Fires when a post is transitioned from one status to another.
+	 *
+	 * The dynamic portions of the hook name, `$new_status` and `$post->post_type`,
+	 * refer to the new post status and post type, respectively.
+	 *
+	 * Please note: When this action is hooked using a particular post status (like
+	 * 'publish', as `publish_{$post->post_type}`), it will fire both when a post is
+	 * first transitioned to that status from something else, as well as upon
+	 * subsequent post updates (old and new status are both the same).
+	 *
+	 * Therefore, if you are looking to only fire a callback when a post is first
+	 * transitioned to a status, use the {@see 'transition_post_status'} hook instead.
+	 *
+	 * @since 2.3.0
+	 *
+	 * @param int     $post_id Post ID.
+	 * @param WP_Post $post    Post object.
+	 */
+	do_action( "{$new_status}_{$post->post_type}", $post->ID, $post );
 }
 //
 // Trackback and ping functions
 //
 /**
-* Add a URL to those already pung.
+* Add a URL to those already pinged.
 *
 * @since 1.5.0
-* @uses $wpdb
+*
-*
+* @global wpdb $wpdb WordPress database abstraction object.
-* @param int $post_id Post ID.
+*
-* @param string $uri Ping URI.
+* @param int    $post_id Post ID.
+* @param string $uri     Ping URI.
 * @return int How many rows were updated.
 */
-function add_ping($post_id, $uri) {
+function add_ping( $post_id, $uri ) {
 	global $wpdb;
 	$pung = $wpdb->get_var( $wpdb->prepare( "SELECT pinged FROM $wpdb->posts WHERE ID = %d", $post_id ));
 	$pung = trim($pung);
 	$pung = preg_split('/\s/', $pung);
 	$pung[] = $uri;
 	$new = implode("\n", $pung);
-	$new = apply_filters('add_ping', $new);
-	// expected_slashed ($new)
+	/**
+	 * Filter the new ping URL to add for the given post.
+	 *
+	 * @since 2.0.0
+	 *
+	 * @param string $new New ping URL to add.
+	 */
+	$new = apply_filters( 'add_ping', $new );
+	// expected_slashed ($new).
 	$new = wp_unslash($new);
 	return $wpdb->update( $wpdb->posts, array( 'pinged' => $new ), array( 'ID' => $post_id ) );
 }
 /**
 * Retrieve enclosures already enclosed for a post.
 *
 * @since 1.5.0
 *
 * @param int $post_id Post ID.
-* @return array List of enclosures
+* @return array List of enclosures.
 */
-function get_enclosed($post_id) {
+function get_enclosed( $post_id ) {
 	$custom_fields = get_post_custom( $post_id );
 	$pung = array();
 	if ( !is_array( $custom_fields ) )
 		return $pung;
 		foreach( $val as $enc ) {
 			$enclosure = explode( "\n", $enc );
 			$pung[] = trim( $enclosure[ 0 ] );
 		}
 	}
-	$pung = apply_filters('get_enclosed', $pung, $post_id);
+	/**
+	 * Filter the list of enclosures already enclosed for the given post.
+	 *
+	 * @since 2.0.0
+	 *
+	 * @param array $pung    Array of enclosures for the given post.
+	 * @param int   $post_id Post ID.
+	 */
+	$pung = apply_filters( 'get_enclosed', $pung, $post_id );
 	return $pung;
 }
 /**
 * Retrieve URLs already pinged for a post.
 *
 * @since 1.5.0
-* @uses $wpdb
+*
+* @global wpdb $wpdb WordPress database abstraction object.
 *
 * @param int $post_id Post ID.
 * @return array
 */
-function get_pung($post_id) {
+function get_pung( $post_id ) {
 	global $wpdb;
 	$pung = $wpdb->get_var( $wpdb->prepare( "SELECT pinged FROM $wpdb->posts WHERE ID = %d", $post_id ));
 	$pung = trim($pung);
 	$pung = preg_split('/\s/', $pung);
-	$pung = apply_filters('get_pung', $pung);
+	/**
+	 * Filter the list of already-pinged URLs for the given post.
+	 *
+	 * @since 2.0.0
+	 *
+	 * @param array $pung Array of URLs already pinged for the given post.
+	 */
+	$pung = apply_filters( 'get_pung', $pung );
 	return $pung;
 }
 /**
 * Retrieve URLs that need to be pinged.
 *
 * @since 1.5.0
-* @uses $wpdb
+*
+* @global wpdb $wpdb WordPress database abstraction object.
 *
 * @param int $post_id Post ID
 * @return array
 */
-function get_to_ping($post_id) {
+function get_to_ping( $post_id ) {
 	global $wpdb;
 	$to_ping = $wpdb->get_var( $wpdb->prepare( "SELECT to_ping FROM $wpdb->posts WHERE ID = %d", $post_id ));
 	$to_ping = sanitize_trackback_urls( $to_ping );
 	$to_ping = preg_split('/\s/', $to_ping, -1, PREG_SPLIT_NO_EMPTY);
-	$to_ping = apply_filters('get_to_ping',  $to_ping);
+	/**
+	 * Filter the list of URLs yet to ping for the given post.
+	 *
+	 * @since 2.0.0
+	 *
+	 * @param array $to_ping List of URLs yet to ping.
+	 */
+	$to_ping = apply_filters( 'get_to_ping', $to_ping );
 	return $to_ping;
 }
 /**
 * Do trackbacks for a list of URLs.
 *
 * @since 1.0.0
 *
-* @param string $tb_list Comma separated list of URLs
+* @param string $tb_list Comma separated list of URLs.
-* @param int $post_id Post ID
+* @param int    $post_id Post ID.
 */
-function trackback_url_list($tb_list, $post_id) {
+function trackback_url_list( $tb_list, $post_id ) {
 	if ( ! empty( $tb_list ) ) {
-		// get post data
+		// Get post data.
-		$postdata = get_post($post_id, ARRAY_A);
+		$postdata = get_post( $post_id, ARRAY_A );
-		// import postdata as variables
+		// Form an excerpt.
-		extract($postdata, EXTR_SKIP);
+		$excerpt = strip_tags( $postdata['post_excerpt'] ? $postdata['post_excerpt'] : $postdata['post_content'] );
-		// form an excerpt
+		if ( strlen( $excerpt ) > 255 ) {
-		$excerpt = strip_tags($post_excerpt ? $post_excerpt : $post_content);
+			$excerpt = substr( $excerpt, 0, 252 ) . '&hellip;';
+		}
-		if (strlen($excerpt) > 255) {
-			$excerpt = substr($excerpt,0,252) . '&hellip;';
+		$trackback_urls = explode( ',', $tb_list );
-		}
+		foreach( (array) $trackback_urls as $tb_url ) {
+			$tb_url = trim( $tb_url );
-		$trackback_urls = explode(',', $tb_list);
+			trackback( $tb_url, wp_unslash( $postdata['post_title'] ), $excerpt, $post_id );
-		foreach( (array) $trackback_urls as $tb_url) {
-			$tb_url = trim($tb_url);
-			trackback($tb_url, wp_unslash($post_title), $excerpt, $post_id);
 		}
 	}
 }
 //
 /**
 * Get a list of page IDs.
 *
 * @since 2.0.0
-* @uses $wpdb
+*
+* @global wpdb $wpdb WordPress database abstraction object.
 *
 * @return array List of page IDs.
 */
 function get_all_page_ids() {
 	global $wpdb;
 * Retrieves page data given a page ID or page object.
 *
 * Use get_post() instead of get_page().
 *
 * @since 1.5.1
-* @deprecated 3.5.0
+* @deprecated 3.5.0 Use get_post()
 *
-* @param mixed $page Page object or page ID. Passed by reference.
+* @param mixed  $page   Page object or page ID. Passed by reference.
-* @param string $output What to output. OBJECT, ARRAY_A, or ARRAY_N.
+* @param string $output Optional. What to output. Accepts OBJECT, ARRAY_A, or ARRAY_N.
-* @param string $filter How the return value should be filtered.
+*                       Default OBJECT.
-* @return WP_Post|null WP_Post on success or null on failure
+* @param string $filter Optional. How the return value should be filtered. Accepts 'raw',
+*                       'edit', 'db', 'display'. Default 'raw'.
+* @return WP_Post|null WP_Post on success or null on failure.
 */
 function get_page( $page, $output = OBJECT, $filter = 'raw') {
 	return get_post( $page, $output, $filter );
 }
 /**
 * Retrieves a page given its path.
 *
 * @since 2.1.0
-* @uses $wpdb
+*
-*
+* @global wpdb $wpdb WordPress database abstraction object.
-* @param string $page_path Page path
+*
-* @param string $output Optional. Output type. OBJECT, ARRAY_N, or ARRAY_A. Default OBJECT.
+* @param string       $page_path Page path.
-* @param string $post_type Optional. Post type. Default page.
+* @param string       $output    Optional. Output type. Accepts OBJECT, ARRAY_N, or ARRAY_A.
-* @return WP_Post|null WP_Post on success or null on failure
+*                                Default OBJECT.
-*/
+* @param string|array $post_type Optional. Post type or array of post types. Default 'page'.
-function get_page_by_path($page_path, $output = OBJECT, $post_type = 'page') {
+* @return WP_Post|null WP_Post on success or null on failure.
+*/
+function get_page_by_path( $page_path, $output = OBJECT, $post_type = 'page' ) {
 	global $wpdb;
 	$page_path = rawurlencode(urldecode($page_path));
 	$page_path = str_replace('%2F', '/', $page_path);
 	$page_path = str_replace('%20', ' ', $page_path);
 	$parts = explode( '/', trim( $page_path, '/' ) );
 	$parts = esc_sql( $parts );
 	$parts = array_map( 'sanitize_title_for_query', $parts );
-	$in_string = "'". implode( "','", $parts ) . "'";
+	$in_string = "'" . implode( "','", $parts ) . "'";
-	$post_type_sql = esc_sql( $post_type );
-	$pages = $wpdb->get_results( "SELECT ID, post_name, post_parent, post_type FROM $wpdb->posts WHERE post_name IN ($in_string) AND (post_type = '$post_type_sql' OR post_type = 'attachment')", OBJECT_K );
+	if ( is_array( $post_type ) ) {
+		$post_types = $post_type;
+	} else {
+		$post_types = array( $post_type, 'attachment' );
+	}
+	$post_types = esc_sql( $post_types );
+	$post_type_in_string = "'" . implode( "','", $post_types ) . "'";
+	$sql = "
+		SELECT ID, post_name, post_parent, post_type
+		FROM $wpdb->posts
+		WHERE post_name IN ($in_string)
+		AND post_type IN ($post_type_in_string)
+	";
+	$pages = $wpdb->get_results( $sql, OBJECT_K );
 	$revparts = array_reverse( $parts );
 	$foundid = 0;
 	foreach ( (array) $pages as $page ) {
 /**
 * Retrieve a page given its title.
 *
 * @since 2.1.0
-* @uses $wpdb
+*
-*
+* @global wpdb $wpdb WordPress database abstraction object.
-* @param string $page_title Page title
+*
-* @param string $output Optional. Output type. OBJECT, ARRAY_N, or ARRAY_A. Default OBJECT.
+* @param string       $page_title Page title
-* @param string $post_type Optional. Post type. Default page.
+* @param string       $output     Optional. Output type. OBJECT, ARRAY_N, or ARRAY_A.
+*                                 Default OBJECT.
+* @param string|array $post_type  Optional. Post type or array of post types. Default 'page'.
 * @return WP_Post|null WP_Post on success or null on failure
 */
-function get_page_by_title($page_title, $output = OBJECT, $post_type = 'page' ) {
+function get_page_by_title( $page_title, $output = OBJECT, $post_type = 'page' ) {
 	global $wpdb;
-	$page = $wpdb->get_var( $wpdb->prepare( "SELECT ID FROM $wpdb->posts WHERE post_title = %s AND post_type= %s", $page_title, $post_type ) );
+	if ( is_array( $post_type ) ) {
+		$post_type = esc_sql( $post_type );
+		$post_type_in_string = "'" . implode( "','", $post_type ) . "'";
+		$sql = $wpdb->prepare( "
+			SELECT ID
+			FROM $wpdb->posts
+			WHERE post_title = %s
+			AND post_type IN ($post_type_in_string)
+		", $page_title );
+	} else {
+		$sql = $wpdb->prepare( "
+			SELECT ID
+			FROM $wpdb->posts
+			WHERE post_title = %s
+			AND post_type = %s
+		", $page_title, $post_type );
+	}
+	$page = $wpdb->get_var( $sql );
 	if ( $page )
 		return get_post( $page, $output );
 	return null;
 }
 * children for the same to retrieve all children of a page. Does not make any
 * SQL queries to get the children.
 *
 * @since 1.5.1
 *
-* @param int $page_id Page ID.
+* @param int   $page_id    Page ID.
-* @param array $pages List of pages' objects.
+* @param array $pages      List of pages' objects.
-* @return array
+* @return array List of page children.
 */
-function get_page_children($page_id, $pages) {
+function get_page_children( $page_id, $pages ) {
 	$page_list = array();
 	foreach ( (array) $pages as $page ) {
 		if ( $page->post_parent == $page_id ) {
 			$page_list[] = $page;
-			if ( $children = get_page_children($page->ID, $pages) )
+			if ( $children = get_page_children( $page->ID, $pages ) ) {
-				$page_list = array_merge($page_list, $children);
+				$page_list = array_merge( $page_list, $children );
-		}
+			}
-	}
+		}
+	}
 	return $page_list;
 }
 /**
 * Order the pages with children under parents in a flat list.
 * It uses auxiliary structure to hold parent-children relationships and
 * runs in O(N) complexity
 *
 * @since 2.0.0
 *
-* @param array $pages Posts array.
+* @param array $pages   Posts array, passed by reference.
-* @param int $page_id Parent page ID.
+* @param int   $page_id Optional. Parent page ID. Default 0.
 * @return array A list arranged by hierarchy. Children immediately follow their parents.
 */
 function get_page_hierarchy( &$pages, $page_id = 0 ) {
 	if ( empty( $pages ) ) {
 		$result = array();
 	return $result;
 }
 /**
-* function to traverse and return all the nested children post names of a root page.
+* Traverse and return all the nested children post names of a root page.
+*
 * $children contains parent-children relations
 *
 * @since 2.9.0
+*
+* @see _page_traverse_name()
+*
+* @param int   $page_id   Page ID.
+* @param array &$children Parent-children relations, passed by reference.
+* @param array &$result   Result, passed by reference.
 */
 function _page_traverse_name( $page_id, &$children, &$result ){
 	if ( isset( $children[ $page_id ] ) ){
 		foreach( (array)$children[ $page_id ] as $child ) {
 			$result[ $child->ID ] = $child->post_name;
 		}
 	}
 }
 /**
-* Builds URI for a page.
+* Build URI for a page.
 *
 * Sub pages will be in the "directory" under the parent page post name.
 *
 * @since 1.5.0
 *
-* @param mixed $page Page object or page ID.
+* @param WP_Post|object|int $page Page object or page ID.
 * @return string|false Page URI, false on error.
 */
 function get_page_uri( $page ) {
 	$page = get_post( $page );
 }
 /**
 * Retrieve a list of pages.
 *
-* @global wpdb $wpdb WordPress database abstraction object
+* @global wpdb $wpdb WordPress database abstraction object.
 *
 * @since 1.5.0
 *
-* @param mixed $args {
+* @param array|string $args {
-*     Array or string of arguments. Optional.
+*     Optional. Array or string of arguments to retrieve pages.
 *
-*     @type int    'child_of'     Page ID to return child and grandchild pages of. Default 0, or no restriction.
+*     @type int          $child_of     Page ID to return child and grandchild pages of.
-*     @type string 'sort_order'   How to sort retrieved pages.
+*                                      Default 0, or no restriction.
-*                                 Default 'ASC'. Accepts 'ASC', 'DESC'.
+*     @type string       $sort_order   How to sort retrieved pages. Accepts 'ASC', 'DESC'. Default 'ASC'.
-*     @type string 'sort_column'  What columns to sort pages by, comma-separated.
+*     @type string       $sort_column  What columns to sort pages by, comma-separated. Accepts 'post_author',
-*                                 Default 'post_title'. Accepts 'post_author', 'post_date', 'post_title', 'post_name',
+*                                      'post_date', 'post_title', 'post_name', 'post_modified', 'menu_order',
-*                                 'post_modified', 'post_modified_gmt', 'menu_order', 'post_parent', 'ID', 'rand',
+*                                      'post_modified_gmt', 'post_parent', 'ID', 'rand', 'comment_count'.
-*                                 'comment_count'. 'post_' can be omitted for any values that start with it.
+*                                      'post_' can be omitted for any values that start with it.
-*     @type bool   'hierarchical' Whether to return pages hierarchically. Default true.
+*                                      Default 'post_title'.
-*     @type array  'exclude'      Array of page IDs to exclude.
+*     @type bool         $hierarchical Whether to return pages hierarchically. Default true.
-*     @type array  'include'      Array of page IDs to include. Cannot be used with 'child_of', 'parent', 'exclude',
+*     @type array        $exclude      Array of page IDs to exclude. Default empty array.
-*                                 'meta_key', 'meta_value', or 'hierarchical'.
+*     @type array        $include      Array of page IDs to include. Cannot be used with `$child_of`,
-*     @type string 'meta_key'     Only include pages with this meta key.
+*                                      `$parent`, `$exclude`, `$meta_key`, `$meta_value`, or `$hierarchical`.
-*     @type string 'meta_value'   Only include pages with this meta value.
+*                                      Default empty array.
-*     @type string 'authors'      A comma-separated list of author IDs.
+*     @type string       $meta_key     Only include pages with this meta key. Default empty.
-*     @type int    'parent'       Page ID to return direct children of. 'hierarchical' must be false.
+*     @type string       $meta_value   Only include pages with this meta value. Requires `$meta_key`.
-*                                 Default -1, or no restriction.
+*                                      Default empty.
-*     @type int    'exclude_tree' Remove all children of the given ID from returned pages.
+*     @type string       $authors      A comma-separated list of author IDs. Default empty.
-*     @type int    'number'       The number of pages to return. Default 0, or all pages.
+*     @type int          $parent       Page ID to return direct children of. `$hierarchical` must be false.
-*     @type int    'offset'       The number of pages to skip before returning. Requires 'number'.
+*                                      Default -1, or no restriction.
-*                                 Default 0.
+*     @type string|array $exclude_tree Comma-separated string or array of page IDs to exclude.
-*     @type string 'post_type'    The post type to query.
+*                                      Default empty array.
-*                                 Default 'page'.
+*     @type int          $number       The number of pages to return. Default 0, or all pages.
-*     @type string 'post_status'  A comma-separated list of post status types to include.
+*     @type int          $offset       The number of pages to skip before returning. Requires `$number`.
-*                                 Default 'publish'.
+*                                      Default 0.
+*     @type string       $post_type    The post type to query. Default 'page'.
+*     @type string       $post_status  A comma-separated list of post status types to include.
+*                                      Default 'publish'.
 * }
-* @return array List of pages matching defaults or $args.
+* @return array List of pages matching defaults or `$args`.
 */
 function get_pages( $args = array() ) {
 	global $wpdb;
-	$pages = false;
 	$defaults = array(
 		'child_of' => 0, 'sort_order' => 'ASC',
 		'sort_column' => 'post_title', 'hierarchical' => 1,
 		'exclude' => array(), 'include' => array(),
 		'meta_key' => '', 'meta_value' => '',
-		'authors' => '', 'parent' => -1, 'exclude_tree' => '',
+		'authors' => '', 'parent' => -1, 'exclude_tree' => array(),
 		'number' => '', 'offset' => 0,
 		'post_type' => 'page', 'post_status' => 'publish',
 	);
 	$r = wp_parse_args( $args, $defaults );
-	extract( $r, EXTR_SKIP );
-	$number = (int) $number;
+	$number = (int) $r['number'];
-	$offset = (int) $offset;
+	$offset = (int) $r['offset'];
+	$child_of = (int) $r['child_of'];
-	// Make sure the post type is hierarchical
+	$hierarchical = $r['hierarchical'];
+	$exclude = $r['exclude'];
+	$meta_key = $r['meta_key'];
+	$meta_value = $r['meta_value'];
+	$parent = $r['parent'];
+	$post_status = $r['post_status'];
+	// Make sure the post type is hierarchical.
 	$hierarchical_post_types = get_post_types( array( 'hierarchical' => true ) );
-	if ( !in_array( $post_type, $hierarchical_post_types ) )
+	if ( ! in_array( $r['post_type'], $hierarchical_post_types ) ) {
-		return $pages;
+		return false;
+	}
-	if ( $parent > 0 && ! $child_of )
+	if ( $parent > 0 && ! $child_of ) {
 		$hierarchical = false;
+	}
-	// Make sure we have a valid post status
-	if ( !is_array( $post_status ) )
+	// Make sure we have a valid post status.
+	if ( ! is_array( $post_status ) ) {
 		$post_status = explode( ',', $post_status );
-	if ( array_diff( $post_status, get_post_stati() ) )
+	}
-		return $pages;
+	if ( array_diff( $post_status, get_post_stati() ) ) {
+		return false;
-	// $args can be whatever, only use the args defined in defaults to compute the key
+	}
-	$key = md5( serialize( compact(array_keys($defaults)) ) );
+	// $args can be whatever, only use the args defined in defaults to compute the key.
+	$key = md5( serialize( wp_array_slice_assoc( $r, array_keys( $defaults ) ) ) );
 	$last_changed = wp_cache_get( 'last_changed', 'posts' );
 	if ( ! $last_changed ) {
 		$last_changed = microtime();
 		wp_cache_set( 'last_changed', $last_changed, 'posts' );
 	}
 	$cache_key = "get_pages:$key:$last_changed";
 	if ( $cache = wp_cache_get( $cache_key, 'posts' ) ) {
-		// Convert to WP_Post instances
+		// Convert to WP_Post instances.
 		$pages = array_map( 'get_post', $cache );
-		$pages = apply_filters('get_pages', $pages, $r);
+		/** This filter is documented in wp-includes/post.php */
+		$pages = apply_filters( 'get_pages', $pages, $r );
 		return $pages;
 	}
-	if ( !is_array($cache) )
-		$cache = array();
 	$inclusions = '';
-	if ( ! empty( $include ) ) {
+	if ( ! empty( $r['include'] ) ) {
 		$child_of = 0; //ignore child_of, parent, exclude, meta_key, and meta_value params if using include
 		$parent = -1;
 		$exclude = '';
 		$meta_key = '';
 		$meta_value = '';
 		$hierarchical = false;
-		$incpages = wp_parse_id_list( $include );
+		$incpages = wp_parse_id_list( $r['include'] );
-		if ( ! empty( $incpages ) )
+		if ( ! empty( $incpages ) ) {
 			$inclusions = ' AND ID IN (' . implode( ',', $incpages ) .  ')';
+		}
 	}
 	$exclusions = '';
 	if ( ! empty( $exclude ) ) {
 		$expages = wp_parse_id_list( $exclude );
-		if ( ! empty( $expages ) )
+		if ( ! empty( $expages ) ) {
 			$exclusions = ' AND ID NOT IN (' . implode( ',', $expages ) .  ')';
+		}
 	}
 	$author_query = '';
-	if (!empty($authors)) {
+	if ( ! empty( $r['authors'] ) ) {
-		$post_authors = preg_split('/[\s,]+/',$authors);
+		$post_authors = preg_split( '/[\s,]+/', $r['authors'] );
 		if ( ! empty( $post_authors ) ) {
 			foreach ( $post_authors as $post_author ) {
 				//Do we have an author id or an author login?
 				if ( 0 == intval($post_author) ) {
 					$post_author = get_user_by('login', $post_author);
-					if ( empty($post_author) )
+					if ( empty( $post_author ) ) {
 						continue;
-					if ( empty($post_author->ID) )
+					}
+					if ( empty( $post_author->ID ) ) {
 						continue;
+					}
 					$post_author = $post_author->ID;
 				}
-				if ( '' == $author_query )
+				if ( '' == $author_query ) {
 					$author_query = $wpdb->prepare(' post_author = %d ', $post_author);
-				else
+				} else {
 					$author_query .= $wpdb->prepare(' OR post_author = %d ', $post_author);
+				}
 			}
-			if ( '' != $author_query )
+			if ( '' != $author_query ) {
 				$author_query = " AND ($author_query)";
+			}
 		}
 	}
 	$join = '';
 	$where = "$exclusions $inclusions ";
 		$join = " LEFT JOIN $wpdb->postmeta ON ( $wpdb->posts.ID = $wpdb->postmeta.post_id )";
 		// meta_key and meta_value might be slashed
 		$meta_key = wp_unslash($meta_key);
 		$meta_value = wp_unslash($meta_value);
-		if ( '' !== $meta_key )
+		if ( '' !== $meta_key ) {
 			$where .= $wpdb->prepare(" AND $wpdb->postmeta.meta_key = %s", $meta_key);
-		if ( '' !== $meta_value )
+		}
+		if ( '' !== $meta_value ) {
 			$where .= $wpdb->prepare(" AND $wpdb->postmeta.meta_value = %s", $meta_value);
+		}
 	}
 	if ( is_array( $parent ) ) {
 		$post_parent__in = implode( ',', array_map( 'absint', (array) $parent ) );
-		if ( ! empty( $post_parent__in ) )
+		if ( ! empty( $post_parent__in ) ) {
 			$where .= " AND post_parent IN ($post_parent__in)";
+		}
 	} elseif ( $parent >= 0 ) {
 		$where .= $wpdb->prepare(' AND post_parent = %d ', $parent);
 	}
 	if ( 1 == count( $post_status ) ) {
-		$where_post_type = $wpdb->prepare( "post_type = %s AND post_status = %s", $post_type, array_shift( $post_status ) );
+		$where_post_type = $wpdb->prepare( "post_type = %s AND post_status = %s", $r['post_type'], reset( $post_status ) );
 	} else {
 		$post_status = implode( "', '", $post_status );
-		$where_post_type = $wpdb->prepare( "post_type = %s AND post_status IN ('$post_status')", $post_type );
+		$where_post_type = $wpdb->prepare( "post_type = %s AND post_status IN ('$post_status')", $r['post_type'] );
 	}
 	$orderby_array = array();
-	$allowed_keys = array('author', 'post_author', 'date', 'post_date', 'title', 'post_title', 'name', 'post_name', 'modified',
+	$allowed_keys = array( 'author', 'post_author', 'date', 'post_date', 'title', 'post_title', 'name', 'post_name', 'modified',
-						  'post_modified', 'modified_gmt', 'post_modified_gmt', 'menu_order', 'parent', 'post_parent',
+		'post_modified', 'modified_gmt', 'post_modified_gmt', 'menu_order', 'parent', 'post_parent',
-						  'ID', 'rand', 'comment_count');
+		'ID', 'rand', 'comment_count' );
-	foreach ( explode( ',', $sort_column ) as $orderby ) {
+	foreach ( explode( ',', $r['sort_column'] ) as $orderby ) {
 		$orderby = trim( $orderby );
-		if ( !in_array( $orderby, $allowed_keys ) )
+		if ( ! in_array( $orderby, $allowed_keys ) ) {
 			continue;
+		}
 		switch ( $orderby ) {
 			case 'menu_order':
 				break;
 			case 'ID':
 				break;
 			case 'comment_count':
 				$orderby = "$wpdb->posts.comment_count";
 				break;
 			default:
-				if ( 0 === strpos( $orderby, 'post_' ) )
+				if ( 0 === strpos( $orderby, 'post_' ) ) {
 					$orderby = "$wpdb->posts." . $orderby;
-				else
+				} else {
 					$orderby = "$wpdb->posts.post_" . $orderby;
+				}
 		}
 		$orderby_array[] = $orderby;
 	}
 	$sort_column = ! empty( $orderby_array ) ? implode( ',', $orderby_array ) : "$wpdb->posts.post_title";
-	$sort_order = strtoupper( $sort_order );
+	$sort_order = strtoupper( $r['sort_order'] );
-	if ( '' !== $sort_order && !in_array( $sort_order, array( 'ASC', 'DESC' ) ) )
+	if ( '' !== $sort_order && ! in_array( $sort_order, array( 'ASC', 'DESC' ) ) ) {
 		$sort_order = 'ASC';
+	}
 	$query = "SELECT * FROM $wpdb->posts $join WHERE ($where_post_type) $where ";
 	$query .= $author_query;
 	$query .= " ORDER BY " . $sort_column . " " . $sort_order ;
-	if ( !empty($number) )
+	if ( ! empty( $number ) ) {
 		$query .= ' LIMIT ' . $offset . ',' . $number;
+	}
 	$pages = $wpdb->get_results($query);
 	if ( empty($pages) ) {
-		$pages = apply_filters('get_pages', array(), $r);
+		/** This filter is documented in wp-includes/post.php */
+		$pages = apply_filters( 'get_pages', array(), $r );
 		return $pages;
 	}
-	// Sanitize before caching so it'll only get done once
+	// Sanitize before caching so it'll only get done once.
 	$num_pages = count($pages);
 	for ($i = 0; $i < $num_pages; $i++) {
 		$pages[$i] = sanitize_post($pages[$i], 'raw');
 	}
 	// Update cache.
 	update_post_cache( $pages );
-	if ( $child_of || $hierarchical )
+	if ( $child_of || $hierarchical ) {
 		$pages = get_page_children($child_of, $pages);
+	}
-	if ( !empty($exclude_tree) ) {
-		$exclude = (int) $exclude_tree;
+	if ( ! empty( $r['exclude_tree'] ) ) {
-		$children = get_page_children($exclude, $pages);
+		$exclude = wp_parse_id_list( $r['exclude_tree'] );
-		$excludes = array();
+		foreach( $exclude as $id ) {
-		foreach ( $children as $child )
+			$children = get_page_children( $id, $pages );
-			$excludes[] = $child->ID;
+			foreach ( $children as $child ) {
-		$excludes[] = $exclude;
+				$exclude[] = $child->ID;
-		$num_pages = count($pages);
+			}
+		}
+		$num_pages = count( $pages );
 		for ( $i = 0; $i < $num_pages; $i++ ) {
-			if ( in_array($pages[$i]->ID, $excludes) )
+			if ( in_array( $pages[$i]->ID, $exclude ) ) {
-				unset($pages[$i]);
+				unset( $pages[$i] );
+			}
 		}
 	}
 	$page_structure = array();
-	foreach ( $pages as $page )
+	foreach ( $pages as $page ) {
 		$page_structure[] = $page->ID;
+	}
 	wp_cache_set( $cache_key, $page_structure, 'posts' );
 	// Convert to WP_Post instances
 	$pages = array_map( 'get_post', $pages );
-	$pages = apply_filters('get_pages', $pages, $r);
+	/**
+	 * Filter the retrieved list of pages.
+	 *
+	 * @since 2.1.0
+	 *
+	 * @param array $pages List of pages to retrieve.
+	 * @param array $r     Array of get_pages() arguments.
+	 */
+	$pages = apply_filters( 'get_pages', $pages, $r );
 	return $pages;
 }
 //
 }
 /**
 * Insert an attachment.
 *
-* If you set the 'ID' in the $object parameter, it will mean that you are
+* If you set the 'ID' in the $args parameter, it will mean that you are
 * updating and attempt to update the attachment. You can also set the
 * attachment name or title by setting the key 'post_name' or 'post_title'.
 *
 * You can set the dates for the attachment manually by setting the 'post_date'
 * and 'post_date_gmt' keys' values.
 *
 * By default, the comments will use the default settings for whether the
 * comments are allowed. You can close them manually or keep them open by
 * setting the value for the 'comment_status' key.
 *
-* The $object parameter can have the following:
-*     'post_status'   - Default is 'draft'. Can not be overridden, set the same as parent post.
-*     'post_type'     - Default is 'post', will be set to attachment. Can not override.
-*     'post_author'   - Default is current user ID. The ID of the user, who added the attachment.
-*     'ping_status'   - Default is the value in default ping status option. Whether the attachment
-*                       can accept pings.
-*     'post_parent'   - Default is 0. Can use $parent parameter or set this for the post it belongs
-*                       to, if any.
-*     'menu_order'    - Default is 0. The order it is displayed.
-*     'to_ping'       - Whether to ping.
-*     'pinged'        - Default is empty string.
-*     'post_password' - Default is empty string. The password to access the attachment.
-*     'guid'          - Global Unique ID for referencing the attachment.
-*     'post_content_filtered' - Attachment post content filtered.
-*     'post_excerpt'  - Attachment excerpt.
-*
 * @since 2.0.0
-* @uses $wpdb
+*
-* @uses do_action() Calls 'edit_attachment' on $post_ID if this is an update.
+* @see wp_insert_post()
-* @uses do_action() Calls 'add_attachment' on $post_ID if this is not an update.
+*
-*
+* @param string|array $args   Arguments for inserting an attachment.
-* @param string|array $object Arguments to override defaults.
+* @param string       $file   Optional. Filename.
-* @param string $file Optional filename.
+* @param int          $parent Optional. Parent post ID.
-* @param int $parent Parent post ID.
 * @return int Attachment ID.
 */
-function wp_insert_attachment($object, $file = false, $parent = 0) {
+function wp_insert_attachment( $args, $file = false, $parent = 0 ) {
-	global $wpdb;
+	$defaults = array(
+		'file'        => $file,
-	$user_id = get_current_user_id();
+		'post_parent' => 0
+	);
-	$defaults = array('post_status' => 'inherit', 'post_type' => 'post', 'post_author' => $user_id,
-		'ping_status' => get_option('default_ping_status'), 'post_parent' => 0, 'post_title' => '',
+	$data = wp_parse_args( $args, $defaults );
-		'menu_order' => 0, 'to_ping' =>  '', 'pinged' => '', 'post_password' => '', 'post_content' => '',
-		'guid' => '', 'post_content_filtered' => '', 'post_excerpt' => '', 'import_id' => 0, 'context' => '');
+	if ( ! empty( $parent ) ) {
+		$data['post_parent'] = $parent;
-	$object = wp_parse_args($object, $defaults);
+	}
-	if ( !empty($parent) )
-		$object['post_parent'] = $parent;
+	$data['post_type'] = 'attachment';
-	unset( $object[ 'filter' ] );
+	return wp_insert_post( $data );
+}
-	$object = sanitize_post($object, 'db');
+/**
-	// export array as variables
+* Trash or delete an attachment.
-	extract($object, EXTR_SKIP);
-	if ( empty($post_author) )
-		$post_author = $user_id;
-	$post_type = 'attachment';
-	if ( ! in_array( $post_status, array( 'inherit', 'private' ) ) )
-		$post_status = 'inherit';
-	if ( !empty($post_category) )
-		$post_category = array_filter($post_category); // Filter out empty terms
-	// Make sure we set a valid category.
-	if ( empty($post_category) || 0 == count($post_category) || !is_array($post_category) ) {
-		$post_category = array();
-	}
-	// Are we updating or creating?
-	if ( !empty($ID) ) {
-		$update = true;
-		$post_ID = (int) $ID;
-	} else {
-		$update = false;
-		$post_ID = 0;
-	}
-	// Create a valid post name.
-	if ( empty($post_name) )
-		$post_name = sanitize_title($post_title);
-	else
-		$post_name = sanitize_title($post_name);
-	// expected_slashed ($post_name)
-	$post_name = wp_unique_post_slug($post_name, $post_ID, $post_status, $post_type, $post_parent);
-	if ( empty($post_date) )
-		$post_date = current_time('mysql');
-	if ( empty($post_date_gmt) )
-		$post_date_gmt = current_time('mysql', 1);
-	if ( empty($post_modified) )
-		$post_modified = $post_date;
-	if ( empty($post_modified_gmt) )
-		$post_modified_gmt = $post_date_gmt;
-	if ( empty($comment_status) ) {
-		if ( $update )
-			$comment_status = 'closed';
-		else
-			$comment_status = get_option('default_comment_status');
-	}
-	if ( empty($ping_status) )
-		$ping_status = get_option('default_ping_status');
-	if ( isset($to_ping) )
-		$to_ping = preg_replace('|\s+|', "\n", $to_ping);
-	else
-		$to_ping = '';
-	if ( isset($post_parent) )
-		$post_parent = (int) $post_parent;
-	else
-		$post_parent = 0;
-	if ( isset($menu_order) )
-		$menu_order = (int) $menu_order;
-	else
-		$menu_order = 0;
-	if ( !isset($post_password) )
-		$post_password = '';
-	if ( ! isset($pinged) )
-		$pinged = '';
-	// expected_slashed (everything!)
-	$data = compact( array( 'post_author', 'post_date', 'post_date_gmt', 'post_content', 'post_content_filtered', 'post_title', 'post_excerpt', 'post_status', 'post_type', 'comment_status', 'ping_status', 'post_password', 'post_name', 'to_ping', 'pinged', 'post_modified', 'post_modified_gmt', 'post_parent', 'menu_order', 'post_mime_type', 'guid' ) );
-	$data = wp_unslash( $data );
-	if ( $update ) {
-		$wpdb->update( $wpdb->posts, $data, array( 'ID' => $post_ID ) );
-	} else {
-		// If there is a suggested ID, use it if not already present
-		if ( !empty($import_id) ) {
-			$import_id = (int) $import_id;
-			if ( ! $wpdb->get_var( $wpdb->prepare("SELECT ID FROM $wpdb->posts WHERE ID = %d", $import_id) ) ) {
-				$data['ID'] = $import_id;
-			}
-		}
-		$wpdb->insert( $wpdb->posts, $data );
-		$post_ID = (int) $wpdb->insert_id;
-	}
-	if ( empty($post_name) ) {
-		$post_name = sanitize_title($post_title, $post_ID);
-		$wpdb->update( $wpdb->posts, compact("post_name"), array( 'ID' => $post_ID ) );
-	}
-	if ( is_object_in_taxonomy($post_type, 'category') )
-		wp_set_post_categories( $post_ID, $post_category );
-	if ( isset( $tags_input ) && is_object_in_taxonomy($post_type, 'post_tag') )
-		wp_set_post_tags( $post_ID, $tags_input );
-	// support for all custom taxonomies
-	if ( !empty($tax_input) ) {
-		foreach ( $tax_input as $taxonomy => $tags ) {
-			$taxonomy_obj = get_taxonomy($taxonomy);
-			if ( is_array($tags) ) // array = hierarchical, string = non-hierarchical.
-				$tags = array_filter($tags);
-			if ( current_user_can($taxonomy_obj->cap->assign_terms) )
-				wp_set_post_terms( $post_ID, $tags, $taxonomy );
-		}
-	}
-	if ( $file )
-		update_attached_file( $post_ID, $file );
-	clean_post_cache( $post_ID );
-	if ( ! empty( $context ) )
-		add_post_meta( $post_ID, '_wp_attachment_context', $context, true );
-	if ( $update) {
-		do_action('edit_attachment', $post_ID);
-	} else {
-		do_action('add_attachment', $post_ID);
-	}
-	return $post_ID;
-}
-/**
-* Trashes or deletes an attachment.
 *
 * When an attachment is permanently deleted, the file will also be removed.
 * Deletion removes all post meta fields, taxonomy, comments, etc. associated
 * with the attachment (except the main post).
 *
 * The attachment is moved to the trash instead of permanently deleted unless trash
 * for media is disabled, item is already in the trash, or $force_delete is true.
 *
 * @since 2.0.0
-* @uses $wpdb
+*
-* @uses do_action() Calls 'delete_attachment' hook on Attachment ID.
+* @global wpdb $wpdb WordPress database abstraction object.
 *
-* @param int $post_id Attachment ID.
+* @param int  $post_id      Attachment ID.
-* @param bool $force_delete Whether to bypass trash and force deletion. Defaults to false.
+* @param bool $force_delete Optional. Whether to bypass trash and force deletion.
+*                           Default false.
 * @return mixed False on failure. Post data on success.
 */
 function wp_delete_attachment( $post_id, $force_delete = false ) {
 	global $wpdb;
 	$meta = wp_get_attachment_metadata( $post_id );
 	$backup_sizes = get_post_meta( $post->ID, '_wp_attachment_backup_sizes', true );
 	$file = get_attached_file( $post_id );
-	$intermediate_sizes = array();
-	foreach ( get_intermediate_image_sizes() as $size ) {
-		if ( $intermediate = image_get_intermediate_size( $post_id, $size ) )
-			$intermediate_sizes[] = $intermediate;
-	}
 	if ( is_multisite() )
 		delete_transient( 'dirsize_cache' );
-	do_action('delete_attachment', $post_id);
+	/**
+	 * Fires before an attachment is deleted, at the start of wp_delete_attachment().
+	 *
+	 * @since 2.0.0
+	 *
+	 * @param int $post_id Attachment ID.
+	 */
+	do_action( 'delete_attachment', $post_id );
 	wp_delete_object_term_relationships($post_id, array('category', 'post_tag'));
 	wp_delete_object_term_relationships($post_id, get_object_taxonomies($post->post_type));
-	delete_metadata( 'post', null, '_thumbnail_id', $post_id, true ); // delete all for any posts.
+	// Delete all for any posts.
+	delete_metadata( 'post', null, '_thumbnail_id', $post_id, true );
 	$comment_ids = $wpdb->get_col( $wpdb->prepare( "SELECT comment_ID FROM $wpdb->comments WHERE comment_post_ID = %d", $post_id ));
 	foreach ( $comment_ids as $comment_id )
 		wp_delete_comment( $comment_id, true );
 	$post_meta_ids = $wpdb->get_col( $wpdb->prepare( "SELECT meta_id FROM $wpdb->postmeta WHERE post_id = %d ", $post_id ));
 	foreach ( $post_meta_ids as $mid )
 		delete_metadata_by_mid( 'post', $mid );
+	/** This action is documented in wp-includes/post.php */
 	do_action( 'delete_post', $post_id );
-	$wpdb->delete( $wpdb->posts, array( 'ID' => $post_id ) );
+	$result = $wpdb->delete( $wpdb->posts, array( 'ID' => $post_id ) );
+	if ( ! $result ) {
+		return false;
+	}
+	/** This action is documented in wp-includes/post.php */
 	do_action( 'deleted_post', $post_id );
 	$uploadpath = wp_upload_dir();
 	if ( ! empty($meta['thumb']) ) {
-		// Don't delete the thumb if another attachment uses it
+		// Don't delete the thumb if another attachment uses it.
-		if (! $wpdb->get_row( $wpdb->prepare( "SELECT meta_id FROM $wpdb->postmeta WHERE meta_key = '_wp_attachment_metadata' AND meta_value LIKE %s AND post_id <> %d", '%' . $meta['thumb'] . '%', $post_id)) ) {
+		if (! $wpdb->get_row( $wpdb->prepare( "SELECT meta_id FROM $wpdb->postmeta WHERE meta_key = '_wp_attachment_metadata' AND meta_value LIKE %s AND post_id <> %d", '%' . $wpdb->esc_like( $meta['thumb'] ) . '%', $post_id)) ) {
 			$thumbfile = str_replace(basename($file), $meta['thumb'], $file);
-			/** This filter is documented in wp-admin/custom-header.php */
+			/** This filter is documented in wp-includes/functions.php */
-			$thumbfile = apply_filters('wp_delete_file', $thumbfile);
+			$thumbfile = apply_filters( 'wp_delete_file', $thumbfile );
 			@ unlink( path_join($uploadpath['basedir'], $thumbfile) );
 		}
 	}
-	// remove intermediate and backup images if there are any
+	// Remove intermediate and backup images if there are any.
-	foreach ( $intermediate_sizes as $intermediate ) {
+	if ( isset( $meta['sizes'] ) && is_array( $meta['sizes'] ) ) {
-		/** This filter is documented in wp-admin/custom-header.php */
+		foreach ( $meta['sizes'] as $size => $sizeinfo ) {
-		$intermediate_file = apply_filters( 'wp_delete_file', $intermediate['path'] );
+			$intermediate_file = str_replace( basename( $file ), $sizeinfo['file'], $file );
-		@ unlink( path_join($uploadpath['basedir'], $intermediate_file) );
+			/** This filter is documented in wp-includes/functions.php */
+			$intermediate_file = apply_filters( 'wp_delete_file', $intermediate_file );
+			@ unlink( path_join( $uploadpath['basedir'], $intermediate_file ) );
+		}
 	}
 	if ( is_array($backup_sizes) ) {
 		foreach ( $backup_sizes as $size ) {
 			$del_file = path_join( dirname($meta['file']), $size['file'] );
-			/** This filter is documented in wp-admin/custom-header.php */
+			/** This filter is documented in wp-includes/functions.php */
-			$del_file = apply_filters('wp_delete_file', $del_file);
+			$del_file = apply_filters( 'wp_delete_file', $del_file );
 			@ unlink( path_join($uploadpath['basedir'], $del_file) );
 		}
 	}
-	/** This filter is documented in wp-admin/custom-header.php */
+	wp_delete_file( $file );
-	$file = apply_filters('wp_delete_file', $file);
-	if ( ! empty($file) )
-		@ unlink($file);
 	clean_post_cache( $post );
 	return $post;
 }
 /**
 * Retrieve attachment meta field for attachment ID.
 *
 * @since 2.1.0
 *
-* @param int $post_id Attachment ID
+* @param int  $post_id    Attachment ID. Default 0.
-* @param bool $unfiltered Optional, default is false. If true, filters are not run.
+* @param bool $unfiltered Optional. If true, filters are not run. Default false.
 * @return string|bool Attachment meta field. False on failure.
 */
 function wp_get_attachment_metadata( $post_id = 0, $unfiltered = false ) {
 	$post_id = (int) $post_id;
 	if ( !$post = get_post( $post_id ) )
 	$data = get_post_meta( $post->ID, '_wp_attachment_metadata', true );
 	if ( $unfiltered )
 		return $data;
+	/**
+	 * Filter the attachment meta data.
+	 *
+	 * @since 2.1.0
+	 *
+	 * @param array|bool $data    Array of meta data for the given attachment, or false
+	 *                            if the object does not exist.
+	 * @param int        $post_id Attachment ID.
+	 */
 	return apply_filters( 'wp_get_attachment_metadata', $data, $post->ID );
 }
 /**
 * Update metadata for an attachment.
 *
 * @since 2.1.0
 *
-* @param int $post_id Attachment ID.
+* @param int   $post_id Attachment ID.
-* @param array $data Attachment data.
+* @param array $data    Attachment data.
-* @return int
+* @return int|bool False if $post is invalid.
 */
 function wp_update_attachment_metadata( $post_id, $data ) {
 	$post_id = (int) $post_id;
 	if ( !$post = get_post( $post_id ) )
 		return false;
+	/**
+	 * Filter the updated attachment meta data.
+	 *
+	 * @since 2.1.0
+	 *
+	 * @param array $data    Array of updated attachment meta data.
+	 * @param int   $post_id Attachment ID.
+	 */
 	if ( $data = apply_filters( 'wp_update_attachment_metadata', $data, $post->ID ) )
 		return update_post_meta( $post->ID, '_wp_attachment_metadata', $data );
 	else
 		return delete_post_meta( $post->ID, '_wp_attachment_metadata' );
 }
 /**
 * Retrieve the URL for an attachment.
 *
 * @since 2.1.0
 *
-* @param int $post_id Attachment ID.
+* @param int $post_id Optional. Attachment ID. Default 0.
-* @return string
+* @return string|bool Attachment URL, otherwise false.
 */
 function wp_get_attachment_url( $post_id = 0 ) {
 	$post_id = (int) $post_id;
 	if ( !$post = get_post( $post_id ) )
 		return false;
 	if ( 'attachment' != $post->post_type )
 		return false;
 	$url = '';
-	if ( $file = get_post_meta( $post->ID, '_wp_attached_file', true) ) { //Get attached file
+	// Get attached file.
-		if ( ($uploads = wp_upload_dir()) && false === $uploads['error'] ) { //Get upload directory
+	if ( $file = get_post_meta( $post->ID, '_wp_attached_file', true) ) {
-			if ( 0 === strpos($file, $uploads['basedir']) ) //Check that the upload base exists in the file location
+		// Get upload directory.
-				$url = str_replace($uploads['basedir'], $uploads['baseurl'], $file); //replace file location with url location
+		if ( ($uploads = wp_upload_dir()) && false === $uploads['error'] ) {
-			elseif ( false !== strpos($file, 'wp-content/uploads') )
+			// Check that the upload base exists in the file location.
+			if ( 0 === strpos( $file, $uploads['basedir'] ) ) {
+				// Replace file location with url location.
+				$url = str_replace($uploads['basedir'], $uploads['baseurl'], $file);
+			} elseif ( false !== strpos($file, 'wp-content/uploads') ) {
 				$url = $uploads['baseurl'] . substr( $file, strpos($file, 'wp-content/uploads') + 18 );
-			else
+			} else {
-				$url = $uploads['baseurl'] . "/$file"; //Its a newly uploaded file, therefor $file is relative to the basedir.
+				// It's a newly-uploaded file, therefore $file is relative to the basedir.
-		}
+				$url = $uploads['baseurl'] . "/$file";
-	}
+			}
+		}
-	if ( empty($url) ) //If any of the above options failed, Fallback on the GUID as used pre-2.7, not recommended to rely upon this.
+	}
+	/*
+	 * If any of the above options failed, Fallback on the GUID as used pre-2.7,
+	 * not recommended to rely upon this.
+	 */
+	if ( empty($url) ) {
 		$url = get_the_guid( $post->ID );
+	}
+	// On SSL front-end, URLs should be HTTPS.
+	if ( is_ssl() && ! is_admin() && 'wp-login.php' !== $GLOBALS['pagenow'] ) {
+		$url = set_url_scheme( $url );
+	}
+	/**
+	 * Filter the attachment URL.
+	 *
+	 * @since 2.1.0
+	 *
+	 * @param string $url     URL for the given attachment.
+	 * @param int    $post_id Attachment ID.
+	 */
 	$url = apply_filters( 'wp_get_attachment_url', $url, $post->ID );
 	if ( empty( $url ) )
 		return false;
 /**
 * Retrieve thumbnail for an attachment.
 *
 * @since 2.1.0
 *
-* @param int $post_id Attachment ID.
+* @param int $post_id Optional. Attachment ID. Default 0.
 * @return mixed False on failure. Thumbnail file path on success.
 */
 function wp_get_attachment_thumb_file( $post_id = 0 ) {
 	$post_id = (int) $post_id;
 	if ( !$post = get_post( $post_id ) )
 	if ( !is_array( $imagedata = wp_get_attachment_metadata( $post->ID ) ) )
 		return false;
 	$file = get_attached_file( $post->ID );
-	if ( !empty($imagedata['thumb']) && ($thumbfile = str_replace(basename($file), $imagedata['thumb'], $file)) && file_exists($thumbfile) )
+	if ( !empty($imagedata['thumb']) && ($thumbfile = str_replace(basename($file), $imagedata['thumb'], $file)) && file_exists($thumbfile) ) {
+		/**
+		 * Filter the attachment thumbnail file path.
+		 *
+		 * @since 2.1.0
+		 *
+		 * @param string $thumbfile File path to the attachment thumbnail.
+		 * @param int    $post_id   Attachment ID.
+		 */
 		return apply_filters( 'wp_get_attachment_thumb_file', $thumbfile, $post->ID );
+	}
 	return false;
 }
 /**
 * Retrieve URL for an attachment thumbnail.
 *
 * @since 2.1.0
 *
-* @param int $post_id Attachment ID
+* @param int $post_id Optional. Attachment ID. Default 0.
 * @return string|bool False on failure. Thumbnail URL on success.
 */
 function wp_get_attachment_thumb_url( $post_id = 0 ) {
 	$post_id = (int) $post_id;
 	if ( !$post = get_post( $post_id ) )
 	if ( !$thumb = wp_get_attachment_thumb_file( $post->ID ) )
 		return false;
 	$url = str_replace(basename($url), basename($thumb), $url);
+	/**
+	 * Filter the attachment thumbnail URL.
+	 *
+	 * @since 2.1.0
+	 *
+	 * @param string $url     URL for the attachment thumbnail.
+	 * @param int    $post_id Attachment ID.
+	 */
 	return apply_filters( 'wp_get_attachment_thumb_url', $url, $post->ID );
 }
 /**
-* Check if the attachment is an image.
+* Verifies an attachment is of a given type.
+*
+* @since 4.2.0
+*
+* @param string      $type    Attachment type. Accepts 'image', 'audio', or 'video'.
+* @param int|WP_Post $post_id Optional. Attachment ID. Default 0.
+* @return bool True if one of the accepted types, false otherwise.
+*/
+function wp_attachment_is( $type, $post_id = 0 ) {
+	if ( ! $post = get_post( $post_id ) ) {
+		return false;
+	}
+	if ( ! $file = get_attached_file( $post->ID ) ) {
+		return false;
+	}
+	if ( 0 === strpos( $post->post_mime_type, $type . '/' ) ) {
+		return true;
+	}
+	$check = wp_check_filetype( $file );
+	if ( empty( $check['ext'] ) ) {
+		return false;
+	}
+	$ext = $check['ext'];
+	if ( 'import' !== $post->post_mime_type ) {
+		return $type === $ext;
+	}
+	switch ( $type ) {
+	case 'image':
+		$image_exts = array( 'jpg', 'jpeg', 'jpe', 'gif', 'png' );
+		return in_array( $ext, $image_exts );
+	case 'audio':
+		return in_array( $ext, wp_get_audio_extensions() );
+	case 'video':
+		return in_array( $ext, wp_get_video_extensions() );
+	default:
+		return $type === $ext;
+	}
+}
+/**
+* Checks if the attachment is an image.
 *
 * @since 2.1.0
-*
+* @since 4.2.0 Modified into wrapper for wp_attachment_is()
-* @param int $post_id Attachment ID
+*
-* @return bool
+* @param int|WP_Post $post Optional. Attachment ID. Default 0.
-*/
+* @return bool Whether the attachment is an image.
-function wp_attachment_is_image( $post_id = 0 ) {
+*/
-	$post_id = (int) $post_id;
+function wp_attachment_is_image( $post = 0 ) {
-	if ( !$post = get_post( $post_id ) )
+	return wp_attachment_is( 'image', $post );
-		return false;
-	if ( !$file = get_attached_file( $post->ID ) )
-		return false;
-	$ext = preg_match('/\.([^.]+)$/', $file, $matches) ? strtolower($matches[1]) : false;
-	$image_exts = array( 'jpg', 'jpeg', 'jpe', 'gif', 'png' );
-	if ( 'image/' == substr($post->post_mime_type, 0, 6) || $ext && 'import' == $post->post_mime_type && in_array($ext, $image_exts) )
-		return true;
-	return false;
 }
 /**
 * Retrieve the icon for a MIME type.
 *
 * @since 2.1.0
 *
 * @param string|int $mime MIME type or attachment ID.
-* @return string|bool
+* @return string|bool Icon, false otherwise.
 */
 function wp_mime_type_icon( $mime = 0 ) {
 	if ( !is_numeric($mime) )
 		$icon = wp_cache_get("mime_type_icon_$mime");
 		}
 		$icon_files = wp_cache_get('icon_files');
 		if ( !is_array($icon_files) ) {
-			$icon_dir = apply_filters( 'icon_dir', ABSPATH . WPINC . '/images/crystal' );
+			/**
-			$icon_dir_uri = apply_filters( 'icon_dir_uri', includes_url('images/crystal') );
+			 * Filter the icon directory path.
-			$dirs = apply_filters( 'icon_dirs', array($icon_dir => $icon_dir_uri) );
+			 *
+			 * @since 2.0.0
+			 *
+			 * @param string $path Icon directory absolute path.
+			 */
+			$icon_dir = apply_filters( 'icon_dir', ABSPATH . WPINC . '/images/media' );
+			/**
+			 * Filter the icon directory URI.
+			 *
+			 * @since 2.0.0
+			 *
+			 * @param string $uri Icon directory URI.
+			 */
+			$icon_dir_uri = apply_filters( 'icon_dir_uri', includes_url( 'images/media' ) );
+			/**
+			 * Filter the list of icon directory URIs.
+			 *
+			 * @since 2.5.0
+			 *
+			 * @param array $uris List of icon directory URIs.
+			 */
+			$dirs = apply_filters( 'icon_dirs', array( $icon_dir => $icon_dir_uri ) );
 			$icon_files = array();
 			while ( $dirs ) {
 				$keys = array_keys( $dirs );
 				$dir = array_shift( $keys );
 				$uri = array_shift($dirs);
 				}
 			}
 			wp_cache_add( 'icon_files', $icon_files, 'default', 600 );
 		}
-		// Icon basename - extension = MIME wildcard
+		$types = array();
+		// Icon basename - extension = MIME wildcard.
 		foreach ( $icon_files as $file => $uri )
 			$types[ preg_replace('/^([^.]*).*$/', '$1', basename($file)) ] =& $icon_files[$file];
 		if ( ! empty($mime) ) {
 			$post_mimes[] = substr($mime, 0, strpos($mime, '/'));
 				break;
 			}
 		}
 	}
-	return apply_filters( 'wp_mime_type_icon', $icon, $mime, $post_id ); // Last arg is 0 if function pass mime type.
+	/**
-}
+	 * Filter the mime type icon.
+	 *
-/**
+	 * @since 2.1.0
-* Checked for changed slugs for published post objects and save the old slug.
+	 *
+	 * @param string $icon    Path to the mime type icon.
+	 * @param string $mime    Mime type.
+	 * @param int    $post_id Attachment ID. Will equal 0 if the function passed
+	 *                        the mime type.
+	 */
+	return apply_filters( 'wp_mime_type_icon', $icon, $mime, $post_id );
+}
+/**
+* Check for changed slugs for published post objects and save the old slug.
 *
 * The function is used when a post object of any type is updated,
 * by comparing the current and previous post objects.
 *
 * If the slug was changed and not already part of the old slugs then it will be
 * The most logically usage of this function is redirecting changed post objects, so
 * that those that linked to an changed post will be redirected to the new post.
 *
 * @since 2.1.0
 *
-* @param int $post_id Post ID.
+* @param int     $post_id     Post ID.
-* @param object $post The Post Object
+* @param WP_Post $post        The Post Object
-* @param object $post_before The Previous Post Object
+* @param WP_Post $post_before The Previous Post Object
 * @return int Same as $post_id
 */
-function wp_check_for_changed_slugs($post_id, $post, $post_before) {
+function wp_check_for_changed_slugs( $post_id, $post, $post_before ) {
-	// dont bother if it hasnt changed
+	// Don't bother if it hasnt changed.
 	if ( $post->post_name == $post_before->post_name )
 		return;
-	// we're only concerned with published, non-hierarchical objects
+	// We're only concerned with published, non-hierarchical objects.
 	if ( $post->post_status != 'publish' || is_post_type_hierarchical( $post->post_type ) )
 		return;
 	$old_slugs = (array) get_post_meta($post_id, '_wp_old_slug');
-	// if we haven't added this old slug before, add it now
+	// If we haven't added this old slug before, add it now.
 	if ( !empty( $post_before->post_name ) && !in_array($post_before->post_name, $old_slugs) )
 		add_post_meta($post_id, '_wp_old_slug', $post_before->post_name);
-	// if the new slug was used previously, delete it from the list
+	// If the new slug was used previously, delete it from the list.
 	if ( in_array($post->post_name, $old_slugs) )
 		delete_post_meta($post_id, '_wp_old_slug', $post->post_name);
 }
 /**
 * that can be added to a WHERE clause; this SQL is constructed to allow all
 * published posts, and all private posts to which the user has access.
 *
 * @since 2.2.0
 *
-* @param string $post_type currently only supports 'post' or 'page'.
+* @param string $post_type Post type. Currently only supports 'post' or 'page'.
 * @return string SQL code that can be added to a where clause.
 */
 function get_private_posts_cap_sql( $post_type ) {
 	return get_posts_by_author_sql( $post_type, false );
 }
 /**
 * Retrieve the post SQL based on capability, author, and type.
 *
-* @see get_private_posts_cap_sql() for full description.
-*
 * @since 3.0.0
-* @param string $post_type Post type.
+*
-* @param bool $full Optional. Returns a full WHERE statement instead of just an 'andalso' term.
+* @see get_private_posts_cap_sql()
-* @param int $post_author Optional. Query posts having a single author ID.
+*
-* @param bool $public_only Optional. Only return public posts. Skips cap checks for $current_user.  Default is false.
+* @param string $post_type   Post type.
+* @param bool   $full        Optional. Returns a full WHERE statement instead of just
+*                            an 'andalso' term. Default true.
+* @param int    $post_author Optional. Query posts having a single author ID. Default null.
+* @param bool   $public_only Optional. Only return public posts. Skips cap checks for
+*                            $current_user.  Default false.
 * @return string SQL WHERE code that can be added to a query.
 */
 function get_posts_by_author_sql( $post_type, $full = true, $post_author = null, $public_only = false ) {
 	global $wpdb;
-	// Private posts
+	// Private posts.
 	$post_type_obj = get_post_type_object( $post_type );
 	if ( ! $post_type_obj )
 		return $full ? 'WHERE 1 = 0' : ' 1 = 0 ';
-	// This hook is deprecated. Why you'd want to use it, I dunno.
+	/**
-	if ( ! $cap = apply_filters( 'pub_priv_sql_capability', '' ) )
+	 * Filter the capability to read private posts for a custom post type
+	 * when generating SQL for getting posts by author.
+	 *
+	 * @since 2.2.0
+	 * @deprecated 3.2.0 The hook transitioned from "somewhat useless" to "totally useless".
+	 *
+	 * @param string $cap Capability.
+	 */
+	if ( ! $cap = apply_filters( 'pub_priv_sql_capability', '' ) ) {
 		$cap = $post_type_obj->cap->read_private_posts;
+	}
-	if ( $full ) {
-		if ( null === $post_author ) {
+	$sql = $wpdb->prepare( 'post_type = %s', $post_type );
-			$sql = $wpdb->prepare( 'WHERE post_type = %s AND ', $post_type );
-		} else {
+	if ( null !== $post_author ) {
-			$sql = $wpdb->prepare( 'WHERE post_author = %d AND post_type = %s AND ', $post_author, $post_type );
+		$sql .= $wpdb->prepare( ' AND post_author = %d', $post_author );
-		}
+	}
-	} else {
-		$sql = '';
+	// Only need to check the cap if $public_only is false.
-	}
+	$post_status_sql = "post_status = 'publish'";
-	$sql .= "(post_status = 'publish'";
-	// Only need to check the cap if $public_only is false
 	if ( false === $public_only ) {
 		if ( current_user_can( $cap ) ) {
 			// Does the user have the capability to view private posts? Guess so.
-			$sql .= " OR post_status = 'private'";
+			$post_status_sql .= " OR post_status = 'private'";
 		} elseif ( is_user_logged_in() ) {
 			// Users can view their own private posts.
 			$id = get_current_user_id();
 			if ( null === $post_author || ! $full ) {
-				$sql .= " OR post_status = 'private' AND post_author = $id";
+				$post_status_sql .= " OR post_status = 'private' AND post_author = $id";
 			} elseif ( $id == (int) $post_author ) {
-				$sql .= " OR post_status = 'private'";
+				$post_status_sql .= " OR post_status = 'private'";
 			} // else none
 		} // else none
 	}
-	$sql .= ')';
+	$sql .= " AND ($post_status_sql)";
+	if ( $full ) {
+		$sql = 'WHERE ' . $sql;
+	}
 	return $sql;
 }
 /**
 * server time. The 'blog' value is the date when the last post was posted. The
 * 'gmt' is when the last post was posted in GMT formatted date.
 *
 * @since 0.71
 *
-* @uses apply_filters() Calls 'get_lastpostdate' filter
+* @param string $timezone The location to get the time. Accepts 'gmt', 'blog',
-*
+*                         or 'server'. Default 'server'.
-* @param string $timezone The location to get the time. Can be 'gmt', 'blog', or 'server'.
 * @return string The date of the last post.
 */
-function get_lastpostdate($timezone = 'server') {
+function get_lastpostdate( $timezone = 'server' ) {
+	/**
+	 * Filter the date the last post was published.
+	 *
+	 * @since 2.3.0
+	 *
+	 * @param string $date     Date the last post was published. Likely values are 'gmt',
+	 *                         'blog', or 'server'.
+	 * @param string $timezone Location to use for getting the post published date.
+	 */
 	return apply_filters( 'get_lastpostdate', _get_last_post_time( $timezone, 'date' ), $timezone );
 }
 /**
-* Retrieve last post modified date depending on timezone.
+* Get the timestamp of the last time any post was modified.
 *
 * The server timezone is the default and is the difference between GMT and
 * server time. The 'blog' value is just when the last post was modified. The
 * 'gmt' is when the last post was modified in GMT time.
 *
 * @since 1.2.0
-* @uses apply_filters() Calls 'get_lastpostmodified' filter
+*
-*
+* @param string $timezone Optional. The timezone for the timestamp. Uses the server's internal timezone.
-* @param string $timezone The location to get the time. Can be 'gmt', 'blog', or 'server'.
+*                         Accepts 'server', 'blog', 'gmt'. or 'server'. 'server' uses the server's
-* @return string The date the post was last modified.
+*                         internal timezone. 'blog' uses the `post_modified` field, which proxies
-*/
+*                         to the timezone set for the site. 'gmt' uses the `post_modified_gmt` field.
-function get_lastpostmodified($timezone = 'server') {
+*                         Default 'server'.
+* @return string The timestamp.
+*/
+function get_lastpostmodified( $timezone = 'server' ) {
 	$lastpostmodified = _get_last_post_time( $timezone, 'modified' );
 	$lastpostdate = get_lastpostdate($timezone);
 	if ( $lastpostdate > $lastpostmodified )
 		$lastpostmodified = $lastpostdate;
+	/**
+	 * Filter the date the last post was modified.
+	 *
+	 * @since 2.3.0
+	 *
+	 * @param string $lastpostmodified Date the last post was modified.
+	 * @param string $timezone         Location to use for getting the post modified date.
+	 *                                 See {@see get_lastpostmodified()} for accepted `$timezone` values.
+	 */
 	return apply_filters( 'get_lastpostmodified', $lastpostmodified, $timezone );
 }
 /**
-* Retrieve latest post date data based on timezone.
+* Get the timestamp of the last time any post was modified or published.
 *
+* @since 3.1.0
 * @access private
-* @since 3.1.0
+*
-*
+* @param string $timezone The timezone for the timestamp. See {@see get_lastpostmodified()}
-* @param string $timezone The location to get the time. Can be 'gmt', 'blog', or 'server'.
+*                         for information on accepted values.
-* @param string $field Field to check. Can be 'date' or 'modified'.
+* @param string $field    Post field to check. Accepts 'date' or 'modified'.
-* @return string The date.
+* @return string The timestamp.
 */
 function _get_last_post_time( $timezone, $field ) {
 	global $wpdb;
 	if ( !in_array( $field, array( 'date', 'modified' ) ) )
 }
 /**
 * Updates posts in cache.
 *
-* @package WordPress
-* @subpackage Cache
 * @since 1.5.1
 *
-* @param array $posts Array of post objects
+* @param array $posts Array of post objects, passed by reference.
 */
 function update_post_cache( &$posts ) {
 	if ( ! $posts )
 		return;
 * object cache associated with the post ID.
 *
 * This function not run if $_wp_suspend_cache_invalidation is not empty. See
 * wp_suspend_cache_invalidation().
 *
-* @package WordPress
-* @subpackage Cache
 * @since 2.0.0
 *
-* @uses do_action() Calls 'clean_post_cache' on $id before adding children (if any).
+* @global wpdb $wpdb WordPress database abstraction object.
 *
-* @param int|object $post Post ID or object to remove from the cache
+* @param int|WP_Post $post Post ID or post object to remove from the cache.
 */
 function clean_post_cache( $post ) {
 	global $_wp_suspend_cache_invalidation, $wpdb;
 	if ( ! empty( $_wp_suspend_cache_invalidation ) )
 	clean_object_term_cache( $post->ID, $post->post_type );
 	wp_cache_delete( 'wp_get_archives', 'general' );
+	/**
+	 * Fires immediately after the given post's cache is cleaned.
+	 *
+	 * @since 2.5.0
+	 *
+	 * @param int     $post_id Post ID.
+	 * @param WP_Post $post    Post object.
+	 */
 	do_action( 'clean_post_cache', $post->ID, $post );
-	if ( is_post_type_hierarchical( $post->post_type ) )
-		wp_cache_delete( 'get_pages', 'posts' );
 	if ( 'page' == $post->post_type ) {
 		wp_cache_delete( 'all_page_ids', 'posts' );
+		/**
+		 * Fires immediately after the given page's cache is cleaned.
+		 *
+		 * @since 2.5.0
+		 *
+		 * @param int $post_id Post ID.
+		 */
 		do_action( 'clean_page_cache', $post->ID );
 	}
 	wp_cache_set( 'last_changed', microtime(), 'posts' );
 }
 /**
 * Call major cache updating functions for list of Post objects.
 *
-* @package WordPress
-* @subpackage Cache
 * @since 1.5.0
 *
-* @uses update_post_cache()
+* @param array  $posts             Array of Post objects
-* @uses update_object_term_cache()
+* @param string $post_type         Optional. Post type. Default 'post'.
-* @uses update_postmeta_cache()
+* @param bool   $update_term_cache Optional. Whether to update the term cache. Default true.
-*
+* @param bool   $update_meta_cache Optional. Whether to update the meta cache. Default true.
-* @param array $posts Array of Post objects
+*/
-* @param string $post_type The post type of the posts in $posts. Default is 'post'.
+function update_post_caches( &$posts, $post_type = 'post', $update_term_cache = true, $update_meta_cache = true ) {
-* @param bool $update_term_cache Whether to update the term cache. Default is true.
-* @param bool $update_meta_cache Whether to update the meta cache. Default is true.
-*/
-function update_post_caches(&$posts, $post_type = 'post', $update_term_cache = true, $update_meta_cache = true) {
 	// No point in doing all this work if we didn't match any posts.
 	if ( !$posts )
 		return;
 	update_post_cache($posts);
 	if ( $update_term_cache ) {
 		if ( is_array($post_type) ) {
 			$ptypes = $post_type;
 		} elseif ( 'any' == $post_type ) {
+			$ptypes = array();
 			// Just use the post_types in the supplied posts.
-			foreach ( $posts as $post )
+			foreach ( $posts as $post ) {
 				$ptypes[] = $post->post_type;
+			}
 			$ptypes = array_unique($ptypes);
 		} else {
 			$ptypes = array($post_type);
 		}
 *
 * Performs SQL query to retrieve the metadata for the post IDs and updates the
 * metadata cache for the posts. Therefore, the functions, which call this
 * function, do not need to perform SQL queries on their own.
 *
-* @package WordPress
-* @subpackage Cache
 * @since 2.1.0
 *
 * @param array $post_ids List of post IDs.
-* @return bool|array Returns false if there is nothing to update or an array of metadata.
+* @return bool|array Returns false if there is nothing to update or an array
-*/
+*                    of metadata.
-function update_postmeta_cache($post_ids) {
+*/
+function update_postmeta_cache( $post_ids ) {
 	return update_meta_cache('post', $post_ids);
 }
 /**
 * Will clean the attachment in the cache.
 *
 * Cleaning means delete from the cache. Optionally will clean the term
 * object cache associated with the attachment ID.
 *
-* This function will not run if $_wp_suspend_cache_invalidation is not empty. See
+* This function will not run if $_wp_suspend_cache_invalidation is not empty.
-* wp_suspend_cache_invalidation().
+*
-*
-* @package WordPress
-* @subpackage Cache
 * @since 3.0.0
 *
-* @uses do_action() Calls 'clean_attachment_cache' on $id.
+* @see wp_suspend_cache_invalidation()
 *
-* @param int $id The attachment ID in the cache to clean
+* @param int  $id          The attachment ID in the cache to clean.
-* @param bool $clean_terms optional. Whether to clean terms cache
+* @param bool $clean_terms Optional. Whether to clean terms cache. Default false.
 */
-function clean_attachment_cache($id, $clean_terms = false) {
+function clean_attachment_cache( $id, $clean_terms = false ) {
 	global $_wp_suspend_cache_invalidation;
 	if ( !empty($_wp_suspend_cache_invalidation) )
 		return;
 	wp_cache_delete($id, 'post_meta');
 	if ( $clean_terms )
 		clean_object_term_cache($id, 'attachment');
-	do_action('clean_attachment_cache', $id);
+	/**
+	 * Fires after the given attachment's cache is cleaned.
+	 *
+	 * @since 3.0.0
+	 *
+	 * @param int $id Attachment ID.
+	 */
+	do_action( 'clean_attachment_cache', $id );
 }
 //
 // Hooks
 //
 /**
 * Hook for managing future post transitions to published.
 *
 * @since 2.3.0
 * @access private
-* @uses $wpdb
+*
-* @uses do_action() Calls 'private_to_published' on post ID if this is a 'private_to_published' call.
+* @see wp_clear_scheduled_hook()
-* @uses wp_clear_scheduled_hook() with 'publish_future_post' and post ID.
+* @global wpdb $wpdb WordPress database abstraction object.
 *
-* @param string $new_status New post status
+* @param string  $new_status New post status.
-* @param string $old_status Previous post status
+* @param string  $old_status Previous post status.
-* @param object $post Object type containing the post information
+* @param WP_Post $post       Post object.
 */
-function _transition_post_status($new_status, $old_status, $post) {
+function _transition_post_status( $new_status, $old_status, $post ) {
 	global $wpdb;
 	if ( $old_status != 'publish' && $new_status == 'publish' ) {
-		// Reset GUID if transitioning to publish and it is empty
+		// Reset GUID if transitioning to publish and it is empty.
 		if ( '' == get_the_guid($post->ID) )
 			$wpdb->update( $wpdb->posts, array( 'guid' => get_permalink( $post->ID ) ), array( 'ID' => $post->ID ) );
-		do_action('private_to_published', $post->ID);  // Deprecated, use private_to_publish
-	}
+		/**
+		 * Fires when a post's status is transitioned from private to published.
-	// If published posts changed clear the lastpostmodified cache
+		 *
+		 * @since 1.5.0
+		 * @deprecated 2.3.0 Use 'private_to_publish' instead.
+		 *
+		 * @param int $post_id Post ID.
+		 */
+		do_action('private_to_published', $post->ID);
+	}
+	// If published posts changed clear the lastpostmodified cache.
 	if ( 'publish' == $new_status || 'publish' == $old_status) {
 		foreach ( array( 'server', 'gmt', 'blog' ) as $timezone ) {
 			wp_cache_delete( "lastpostmodified:$timezone", 'timeinfo' );
 			wp_cache_delete( "lastpostdate:$timezone", 'timeinfo' );
 		}
 	}
+	if ( $new_status !== $old_status ) {
+		wp_cache_delete( _count_posts_cache_key( $post->post_type ), 'counts' );
+		wp_cache_delete( _count_posts_cache_key( $post->post_type, 'readable' ), 'counts' );
+	}
 	// Always clears the hook in case the post status bounced from future to draft.
 	wp_clear_scheduled_hook('publish_future_post', array( $post->ID ) );
 }
 /**
 * The $post properties used and must exist are 'ID' and 'post_date_gmt'.
 *
 * @since 2.3.0
 * @access private
 *
-* @param int $deprecated Not used. Can be set to null. Never implemented.
+* @param int     $deprecated Not used. Can be set to null. Never implemented. Not marked
-*   Not marked as deprecated with _deprecated_argument() as it conflicts with
+*                            as deprecated with _deprecated_argument() as it conflicts with
-*   wp_transition_post_status() and the default filter for _future_post_hook().
+*                            wp_transition_post_status() and the default filter for
-* @param object $post Object type containing the post information
+*                            {@see _future_post_hook()}.
+* @param WP_Post $post       Post object.
 */
 function _future_post_hook( $deprecated, $post ) {
 	wp_clear_scheduled_hook( 'publish_future_post', array( $post->ID ) );
 	wp_schedule_single_event( strtotime( get_gmt_from_date( $post->post_date ) . ' GMT') , 'publish_future_post', array( $post->ID ) );
 }
 /**
 * Hook to schedule pings and enclosures when a post is published.
 *
+* Uses XMLRPC_REQUEST and WP_IMPORTING constants.
+*
 * @since 2.3.0
 * @access private
-* @uses XMLRPC_REQUEST and WP_IMPORTING constants.
+*
-* @uses do_action() Calls 'xmlrpc_publish_post' on post ID if XMLRPC_REQUEST is defined.
+* @param int $post_id The ID in the database table of the post being published.
-*
+*/
-* @param int $post_id The ID in the database table of the post being published
+function _publish_post_hook( $post_id ) {
-*/
+	if ( defined( 'XMLRPC_REQUEST' ) ) {
-function _publish_post_hook($post_id) {
+		/**
-	if ( defined('XMLRPC_REQUEST') )
+		 * Fires when _publish_post_hook() is called during an XML-RPC request.
-		do_action('xmlrpc_publish_post', $post_id);
+		 *
+		 * @since 2.1.0
+		 *
+		 * @param int $post_id Post ID.
+		 */
+		do_action( 'xmlrpc_publish_post', $post_id );
+	}
 	if ( defined('WP_IMPORTING') )
 		return;
 	if ( get_option('default_pingback_flag') )
 	wp_schedule_single_event(time(), 'do_pings');
 }
 /**
-* Returns the post's parent's post_ID
+* Return the post's parent's post_ID
 *
 * @since 3.1.0
 *
-* @param int $post_id
+* @param int $post_ID
 *
-* @return int|bool false on error
+* @return int|bool Post parent ID, otherwise false.
 */
 function wp_get_post_parent_id( $post_ID ) {
 	$post = get_post( $post_ID );
 	if ( !$post || is_wp_error( $post ) )
 		return false;
 	return (int) $post->post_parent;
 }
 /**
-* Checks the given subset of the post hierarchy for hierarchy loops.
+* Check the given subset of the post hierarchy for hierarchy loops.
-* Prevents loops from forming and breaks those that it finds.
+*
-*
+* Prevents loops from forming and breaks those that it finds. Attached
-* Attached to the wp_insert_post_parent filter.
+* to the 'wp_insert_post_parent' filter.
 *
 * @since 3.1.0
-* @uses wp_find_hierarchy_loop()
+*
+* @see wp_find_hierarchy_loop()
 *
 * @param int $post_parent ID of the parent for the post we're checking.
-* @param int $post_ID ID of the post we're checking.
+* @param int $post_ID     ID of the post we're checking.
-*
+* @return int The new post_parent for the post, 0 otherwise.
-* @return int The new post_parent for the post.
 */
 function wp_check_post_hierarchy_for_loops( $post_parent, $post_ID ) {
-	// Nothing fancy here - bail
+	// Nothing fancy here - bail.
 	if ( !$post_parent )
 		return 0;
-	// New post can't cause a loop
+	// New post can't cause a loop.
 	if ( empty( $post_ID ) )
 		return $post_parent;
-	// Can't be its own parent
+	// Can't be its own parent.
 	if ( $post_parent == $post_ID )
 		return 0;
-	// Now look for larger loops
+	// Now look for larger loops.
 	if ( !$loop = wp_find_hierarchy_loop( 'wp_get_post_parent_id', $post_ID, $post_parent ) )
 		return $post_parent; // No loop
-	// Setting $post_parent to the given value causes a loop
+	// Setting $post_parent to the given value causes a loop.
 	if ( isset( $loop[$post_ID] ) )
 		return 0;
 	// There's a loop, but it doesn't contain $post_ID. Break the loop.
 	foreach ( array_keys( $loop ) as $loop_member )
 	return $post_parent;
 }
 /**
-* Sets a post thumbnail.
+* Set a post thumbnail.
 *
 * @since 3.1.0
 *
-* @param int|object $post Post ID or object where thumbnail should be attached.
+* @param int|WP_Post $post         Post ID or post object where thumbnail should be attached.
-* @param int $thumbnail_id Thumbnail to attach.
+* @param int         $thumbnail_id Thumbnail to attach.
 * @return bool True on success, false on failure.
 */
 function set_post_thumbnail( $post, $thumbnail_id ) {
 	$post = get_post( $post );
 	$thumbnail_id = absint( $thumbnail_id );
 	if ( $post && $thumbnail_id && get_post( $thumbnail_id ) ) {
-		if ( $thumbnail_html = wp_get_attachment_image( $thumbnail_id, 'thumbnail' ) )
+		if ( wp_get_attachment_image( $thumbnail_id, 'thumbnail' ) )
 			return update_post_meta( $post->ID, '_thumbnail_id', $thumbnail_id );
 		else
 			return delete_post_meta( $post->ID, '_thumbnail_id' );
 	}
 	return false;
 }
 /**
-* Removes a post thumbnail.
+* Remove a post thumbnail.
 *
 * @since 3.3.0
 *
-* @param int|object $post Post ID or object where thumbnail should be removed from.
+* @param int|WP_Post $post Post ID or post object where thumbnail should be removed from.
 * @return bool True on success, false on failure.
 */
 function delete_post_thumbnail( $post ) {
 	$post = get_post( $post );
 	if ( $post )
 		return delete_post_meta( $post->ID, '_thumbnail_id' );
 	return false;
 }
 /**
-* Deletes auto-drafts for new posts that are > 7 days old
+* Delete auto-drafts for new posts that are > 7 days old.
 *
 * @since 3.4.0
+*
+* @global wpdb $wpdb WordPress database abstraction object.
 */
 function wp_delete_auto_drafts() {
 	global $wpdb;
-	// Cleanup old auto-drafts more than 7 days old
+	// Cleanup old auto-drafts more than 7 days old.
 	$old_posts = $wpdb->get_col( "SELECT ID FROM $wpdb->posts WHERE post_status = 'auto-draft' AND DATE_SUB( NOW(), INTERVAL 7 DAY ) > post_date" );
-	foreach ( (array) $old_posts as $delete )
+	foreach ( (array) $old_posts as $delete ) {
-		wp_delete_post( $delete, true ); // Force delete
+		// Force delete.
-}
+		wp_delete_post( $delete, true );
+	}
-/**
+}
-* Update the custom taxonomies' term counts when a post's status is changed. For example, default posts term counts (for custom taxonomies) don't include private / draft posts.
-*
+/**
+* Update the custom taxonomies' term counts when a post's status is changed.
+*
+* For example, default posts term counts (for custom taxonomies) don't include
+* private / draft posts.
+*
+* @since 3.3.0
 * @access private
-* @param string $new_status
+*
-* @param string $old_status
+* @param string  $new_status New post status.
-* @param object $post
+* @param string  $old_status Old post status.
-* @since 3.3.0
+* @param WP_Post $post       Post object.
 */
 function _update_term_count_on_transition_post_status( $new_status, $old_status, $post ) {
 	// Update counts for the post's terms.
 	foreach ( (array) get_object_taxonomies( $post->post_type ) as $taxonomy ) {
 		$tt_ids = wp_get_object_terms( $post->ID, $taxonomy, array( 'fields' => 'tt_ids' ) );
 /**
 * Adds any posts from the given ids to the cache that do not already exist in cache
 *
 * @since 3.4.0
-*
 * @access private
 *
-* @param array $post_ids ID list
+* @see update_post_caches()
-* @param bool $update_term_cache Whether to update the term cache. Default is true.
+*
-* @param bool $update_meta_cache Whether to update the meta cache. Default is true.
+* @param array $ids               ID list
+* @param bool  $update_term_cache Optional. Whether to update the term cache. Default true.
+* @param bool  $update_meta_cache Optional. Whether to update the meta cache. Default true.
 */
 function _prime_post_caches( $ids, $update_term_cache = true, $update_meta_cache = true ) {
 	global $wpdb;
 	$non_cached_ids = _get_non_cached_ids( $ids, 'posts' );

changeset 5	5e2f62d02dcd
parent 0	d970ebf37754
child 7	cf61fcea0001