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

equal deleted inserted replaced

-:490d5cc509ed
+:cf61fcea0001
 <?php
 /**
-* Post functions and post utility function.
+* Core Post API
 *
 * @package WordPress
 * @subpackage Post
-* @since 1.5.0
 */
 //
 // Post Type Registration
 //
 /**
 * Creates the initial post types when 'init' action is fired.
 *
+* See {@see 'init'}.
+*
 * @since 2.9.0
 */
 function create_initial_post_types() {
 	register_post_type( 'post', array(
 		'labels' => array(
-			'name_admin_bar' => _x( 'Post', 'add new on admin bar' ),
+			'name_admin_bar' => _x( 'Post', 'add new from admin bar' ),
 		),
 		'public'  => true,
 		'_builtin' => true, /* internal use only. don't use this when registering your own post type. */
 		'_edit_link' => 'post.php?post=%d', /* internal use only. don't use this when registering your own post type. */
 		'capability_type' => 'post',
 		'map_meta_cap' => true,
+		'menu_position' => 5,
 		'hierarchical' => false,
 		'rewrite' => false,
 		'query_var' => false,
 		'delete_with_user' => true,
 		'supports' => array( 'title', 'editor', 'author', 'thumbnail', 'excerpt', 'trackbacks', 'custom-fields', 'comments', 'revisions', 'post-formats' ),
+		'show_in_rest' => true,
+		'rest_base' => 'posts',
+		'rest_controller_class' => 'WP_REST_Posts_Controller',
 	) );
 	register_post_type( 'page', array(
 		'labels' => array(
-			'name_admin_bar' => _x( 'Page', 'add new on admin bar' ),
+			'name_admin_bar' => _x( 'Page', 'add new from admin bar' ),
 		),
 		'public' => true,
 		'publicly_queryable' => false,
 		'_builtin' => true, /* internal use only. don't use this when registering your own post type. */
 		'_edit_link' => 'post.php?post=%d', /* internal use only. don't use this when registering your own post type. */
 		'capability_type' => 'page',
 		'map_meta_cap' => true,
+		'menu_position' => 20,
 		'hierarchical' => true,
 		'rewrite' => false,
 		'query_var' => false,
 		'delete_with_user' => true,
 		'supports' => array( 'title', 'editor', 'author', 'thumbnail', 'page-attributes', 'custom-fields', 'comments', 'revisions' ),
+		'show_in_rest' => true,
+		'rest_base' => 'pages',
+		'rest_controller_class' => 'WP_REST_Posts_Controller',
 	) );
 	register_post_type( 'attachment', array(
 		'labels' => array(
 			'name' => _x('Media', 'post type general name'),
 			'name_admin_bar' => _x( 'Media', 'add new from admin bar' ),
 			'add_new' => _x( 'Add New', 'add new media' ),
 			'edit_item' => __( 'Edit Media' ),
 			'view_item' => __( 'View Attachment Page' ),
+			'attributes' => __( 'Attachment Attributes' ),
 		),
 		'public' => true,
 		'show_ui' => true,
 		'_builtin' => true, /* internal use only. don't use this when registering your own post type. */
 		'_edit_link' => 'post.php?post=%d', /* internal use only. don't use this when registering your own post type. */
 		'rewrite' => false,
 		'query_var' => false,
 		'show_in_nav_menus' => false,
 		'delete_with_user' => true,
 		'supports' => array( 'title', 'author', 'comments' ),
+		'show_in_rest' => true,
+		'rest_base' => 'media',
+		'rest_controller_class' => 'WP_REST_Attachments_Controller',
 	) );
 	add_post_type_support( 'attachment:audio', 'thumbnail' );
 	add_post_type_support( 'attachment:video', 'thumbnail' );
 	register_post_type( 'revision', array(
 		'rewrite' => false,
 		'delete_with_user' => false,
 		'query_var' => false,
 	) );
+	register_post_type( 'custom_css', array(
+		'labels' => array(
+			'name'          => __( 'Custom CSS' ),
+			'singular_name' => __( 'Custom CSS' ),
+		),
+		'public'           => false,
+		'hierarchical'     => false,
+		'rewrite'          => false,
+		'query_var'        => false,
+		'delete_with_user' => false,
+		'can_export'       => true,
+		'_builtin'         => true, /* internal use only. don't use this when registering your own post type. */
+		'supports'         => array( 'title', 'revisions' ),
+		'capabilities'     => array(
+			'delete_posts'           => 'edit_theme_options',
+			'delete_post'            => 'edit_theme_options',
+			'delete_published_posts' => 'edit_theme_options',
+			'delete_private_posts'   => 'edit_theme_options',
+			'delete_others_posts'    => 'edit_theme_options',
+			'edit_post'              => 'edit_css',
+			'edit_posts'             => 'edit_css',
+			'edit_others_posts'      => 'edit_css',
+			'edit_published_posts'   => 'edit_css',
+			'read_post'              => 'read',
+			'read_private_posts'     => 'read',
+			'publish_posts'          => 'edit_theme_options',
+		),
+	) );
+	register_post_type( 'customize_changeset', array(
+		'labels' => array(
+			'name'               => _x( 'Changesets', 'post type general name' ),
+			'singular_name'      => _x( 'Changeset', 'post type singular name' ),
+			'menu_name'          => _x( 'Changesets', 'admin menu' ),
+			'name_admin_bar'     => _x( 'Changeset', 'add new on admin bar' ),
+			'add_new'            => _x( 'Add New', 'Customize Changeset' ),
+			'add_new_item'       => __( 'Add New Changeset' ),
+			'new_item'           => __( 'New Changeset' ),
+			'edit_item'          => __( 'Edit Changeset' ),
+			'view_item'          => __( 'View Changeset' ),
+			'all_items'          => __( 'All Changesets' ),
+			'search_items'       => __( 'Search Changesets' ),
+			'not_found'          => __( 'No changesets found.' ),
+			'not_found_in_trash' => __( 'No changesets found in Trash.' ),
+		),
+		'public' => false,
+		'_builtin' => true, /* internal use only. don't use this when registering your own post type. */
+		'map_meta_cap' => true,
+		'hierarchical' => false,
+		'rewrite' => false,
+		'query_var' => false,
+		'can_export' => false,
+		'delete_with_user' => false,
+		'supports' => array( 'title', 'author' ),
+		'capability_type' => 'customize_changeset',
+		'capabilities' => array(
+			'create_posts' => 'customize',
+			'delete_others_posts' => 'customize',
+			'delete_post' => 'customize',
+			'delete_posts' => 'customize',
+			'delete_private_posts' => 'customize',
+			'delete_published_posts' => 'customize',
+			'edit_others_posts' => 'customize',
+			'edit_post' => 'customize',
+			'edit_posts' => 'customize',
+			'edit_private_posts' => 'customize',
+			'edit_published_posts' => 'do_not_allow',
+			'publish_posts' => 'customize',
+			'read' => 'read',
+			'read_post' => 'customize',
+			'read_private_posts' => 'customize',
+		),
+	) );
+	register_post_type( 'oembed_cache', array(
+		'labels' => array(
+			'name'          => __( 'oEmbed Responses' ),
+			'singular_name' => __( 'oEmbed Response' ),
+		),
+		'public'           => false,
+		'hierarchical'     => false,
+		'rewrite'          => false,
+		'query_var'        => false,
+		'delete_with_user' => false,
+		'can_export'       => false,
+		'_builtin'         => true, /* internal use only. don't use this when registering your own post type. */
+		'supports'         => array(),
+	) );
+	register_post_type( 'user_request', array(
+		'labels'           => array(
+			'name'          => __( 'User Requests' ),
+			'singular_name' => __( 'User Request' ),
+		),
+		'public'           => false,
+		'_builtin'         => true, /* internal use only. don't use this when registering your own post type. */
+		'hierarchical'     => false,
+		'rewrite'          => false,
+		'query_var'        => false,
+		'can_export'       => false,
+		'delete_with_user' => false,
+		'supports'         => array(),
+	) );
 	register_post_status( 'publish', array(
-		'label'       => _x( 'Published', 'post' ),
+		'label'       => _x( 'Published', 'post status' ),
 		'public'      => true,
 		'_builtin'    => true, /* internal use only. */
 		'label_count' => _n_noop( 'Published <span class="count">(%s)</span>', 'Published <span class="count">(%s)</span>' ),
 	) );
 	register_post_status( 'future', array(
-		'label'       => _x( 'Scheduled', 'post' ),
+		'label'       => _x( 'Scheduled', 'post status' ),
 		'protected'   => true,
 		'_builtin'    => true, /* internal use only. */
 		'label_count' => _n_noop('Scheduled <span class="count">(%s)</span>', 'Scheduled <span class="count">(%s)</span>' ),
 	) );
 	register_post_status( 'draft', array(
-		'label'       => _x( 'Draft', 'post' ),
+		'label'       => _x( 'Draft', 'post status' ),
 		'protected'   => true,
 		'_builtin'    => true, /* internal use only. */
 		'label_count' => _n_noop( 'Draft <span class="count">(%s)</span>', 'Drafts <span class="count">(%s)</span>' ),
 	) );
 	register_post_status( 'pending', array(
-		'label'       => _x( 'Pending', 'post' ),
+		'label'       => _x( 'Pending', 'post status' ),
 		'protected'   => true,
 		'_builtin'    => true, /* internal use only. */
 		'label_count' => _n_noop( 'Pending <span class="count">(%s)</span>', 'Pending <span class="count">(%s)</span>' ),
 	) );
 	register_post_status( 'private', array(
-		'label'       => _x( 'Private', 'post' ),
+		'label'       => _x( 'Private', 'post status' ),
 		'private'     => true,
 		'_builtin'    => true, /* internal use only. */
 		'label_count' => _n_noop( 'Private <span class="count">(%s)</span>', 'Private <span class="count">(%s)</span>' ),
 	) );
 	register_post_status( 'trash', array(
-		'label'       => _x( 'Trash', 'post' ),
+		'label'       => _x( 'Trash', 'post status' ),
 		'internal'    => true,
 		'_builtin'    => true, /* internal use only. */
 		'label_count' => _n_noop( 'Trash <span class="count">(%s)</span>', 'Trash <span class="count">(%s)</span>' ),
 		'show_in_admin_status_list' => true,
 	) );
 		'label'    => 'inherit',
 		'internal' => true,
 		'_builtin' => true, /* internal use only. */
 		'exclude_from_search' => false,
 	) );
+	register_post_status( 'request-pending', array(
+		'label'               => _x( 'Pending', 'request status' ),
+		'internal'            => true,
+		'_builtin'            => true, /* internal use only. */
+		'exclude_from_search' => false,
+	) );
+	register_post_status( 'request-confirmed', array(
+		'label'               => _x( 'Confirmed', 'request status' ),
+		'internal'            => true,
+		'_builtin'            => true, /* internal use only. */
+		'exclude_from_search' => false,
+	) );
+	register_post_status( 'request-failed', array(
+		'label'               => _x( 'Failed', 'request status' ),
+		'internal'            => true,
+		'_builtin'            => true, /* internal use only. */
+		'exclude_from_search' => false,
+	) );
+	register_post_status( 'request-completed', array(
+		'label'               => _x( 'Completed', 'request status' ),
+		'internal'            => true,
+		'_builtin'            => true, /* internal use only. */
+		'exclude_from_search' => false,
+	) );
 }
 /**
 * Retrieve attached file path based on attachment ID.
 *
 *
 * @since 2.0.0
 *
 * @param int  $attachment_id Attachment ID.
 * @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.
+* @return string|false 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 ( $file && 0 !== strpos($file, '/') && !preg_match('|^.:\\\|', $file) && ( ($uploads = wp_upload_dir()) && false === $uploads['error'] ) )
+	if ( $file && 0 !== strpos( $file, '/' ) && ! preg_match( '|^.:\\\|', $file ) && ( ( $uploads = wp_get_upload_dir() ) && false === $uploads['error'] ) ) {
 		$file = $uploads['basedir'] . "/$file";
-	if ( $unfiltered )
+	}
+	if ( $unfiltered ) {
 		return $file;
+	}
 	/**
-	 * Filter the attached file based on the given ID.
+	 * Filters 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.
 function update_attached_file( $attachment_id, $file ) {
 	if ( !get_post( $attachment_id ) )
 		return false;
 	/**
-	 * Filter the path to the attached file to update.
+	 * Filters 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.
 * @return string Relative path on success, unchanged path on failure.
 */
 function _wp_relative_upload_path( $path ) {
 	$new_path = $path;
-	$uploads = wp_upload_dir();
+	$uploads = wp_get_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.
+	 * Filters 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.
 * what context you wish to retrieve the children of.
 *
 * Attachments may also be made the child of a post, so if that is an accurate
 * statement (which needs to be verified), it would then be possible to get
 * all of the attachments for a post. Attachments have since changed since
-* version 2.5, so this is most likely unaccurate, but serves generally as an
+* version 2.5, so this is most likely inaccurate, but serves generally as an
 * example of what is possible.
 *
 * The arguments listed as defaults are for this function and also of the
-* {@link get_posts()} function. The arguments are combined with the
+* get_posts() function. The arguments are combined with the get_children defaults
-* get_children defaults and are then passed to the {@link get_posts()}
+* and are then passed to the get_posts() function, which accepts additional arguments.
-* function, which accepts additional arguments. You can replace the defaults in
+* You can replace the defaults in this function, listed below and the additional
-* this function, listed below and the additional arguments listed in the
+* arguments listed in the get_posts() function.
-* {@link get_posts()} function.
 *
 * The 'post_parent' is the most important argument and important attention
 * needs to be paid to the $args parameter. If you pass either an object or an
 * integer (number), then just the 'post_parent' is grabbed and everything else
 * is lost. If you don't specify any arguments, then it is assumed that you are
 * @since 2.0.0
 *
 * @see get_posts()
 * @todo Check validity of description.
 *
+* @global WP_Post $post
+*
 * @param mixed  $args   Optional. User defined arguments for replacing the defaults. Default empty.
-* @param string $output Optional. Constant for return type. Accepts OBJECT, ARRAY_A, ARRAY_N.
+* @param string $output Optional. The required return type. One of OBJECT, ARRAY_A, or ARRAY_N, which correspond to
-*                       Default OBJECt.
+*                       a WP_Post object, an associative array, or a numeric array, respectively. 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();
 * `<!--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').
+* @return array Post before ('main'), after ('extended'), and custom read more ('more_text').
 */
 function get_extended( $post ) {
 	//Match the new style more links.
 	if ( preg_match('/<!--more(.*?)?-->/', $post, $matches) ) {
 		list($main, $extended) = explode($matches[0], $post, 2);
 }
 /**
 * Retrieves post data given a post ID or post object.
 *
-* See {@link sanitize_post()} for optional $filter values. Also, the parameter
+* See sanitize_post() for optional $filter values. Also, the parameter
-* $post, must be given as a variable, since it is passed by reference.
+* `$post`, must be given as a variable, since it is passed by reference.
 *
 * @since 1.5.1
 *
-* @param int|WP_Post $post   Optional. Post ID or post object. Defaults to global $post.
+* @global WP_Post $post
-* @param string      $output Optional, default is Object. Accepts OBJECT, ARRAY_A, or ARRAY_N.
+*
-*                            Default OBJECT.
+* @param int|WP_Post|null $post   Optional. Post ID or post object. Defaults to global $post.
-* @param string      $filter Optional. Type of filter to apply. Accepts 'raw', 'edit', 'db',
+* @param string           $output Optional. The required return type. One of OBJECT, ARRAY_A, or ARRAY_N, which correspond to
-*                            or 'display'. Default 'raw'.
+*                                 a WP_Post object, an associative array, or a numeric array, respectively. Default OBJECT.
+* @param string           $filter Optional. Type of filter to apply. Accepts 'raw', 'edit', 'db',
+*                                 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'] ) )
 	return $_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 int
-	 */
-	public $ID;
-	/**
-	 * ID of post author.
-	 *
-	 * A numeric string, for compatibility reasons.
-	 *
-	 * @var string
-	 */
-	public $post_author = 0;
-	/**
-	 * The post's local publication time.
-	 *
-	 * @var string
-	 */
-	public $post_date = '0000-00-00 00:00:00';
-	/**
-	 * The post's GMT publication time.
-	 *
-	 * @var string
-	 */
-	public $post_date_gmt = '0000-00-00 00:00:00';
-	/**
-	 * The post's content.
-	 *
-	 * @var string
-	 */
-	public $post_content = '';
-	/**
-	 * The post's title.
-	 *
-	 * @var string
-	 */
-	public $post_title = '';
-	/**
-	 * The post's excerpt.
-	 *
-	 * @var string
-	 */
-	public $post_excerpt = '';
-	/**
-	 * The post's status.
-	 *
-	 * @var string
-	 */
-	public $post_status = 'publish';
-	/**
-	 * Whether comments are allowed.
-	 *
-	 * @var string
-	 */
-	public $comment_status = 'open';
-	/**
-	 * Whether pings are allowed.
-	 *
-	 * @var string
-	 */
-	public $ping_status = 'open';
-	/**
-	 * The post's password in plain text.
-	 *
-	 * @var string
-	 */
-	public $post_password = '';
-	/**
-	 * The post's slug.
-	 *
-	 * @var string
-	 */
-	public $post_name = '';
-	/**
-	 * URLs queued to be pinged.
-	 *
-	 * @var string
-	 */
-	public $to_ping = '';
-	/**
-	 * URLs that have been pinged.
-	 *
-	 * @var string
-	 */
-	public $pinged = '';
-	/**
-	 * The post's local modified time.
-	 *
-	 * @var string
-	 */
-	public $post_modified = '0000-00-00 00:00:00';
-	/**
-	 * The post's GMT modified time.
-	 *
-	 * @var string
-	 */
-	public $post_modified_gmt = '0000-00-00 00:00:00';
-	/**
-	 * A utility DB field for post content.
-	 *
-	 *
-	 * @var string
-	 */
-	public $post_content_filtered = '';
-	/**
-	 * ID of a post's parent post.
-	 *
-	 * @var int
-	 */
-	public $post_parent = 0;
-	/**
-	 * The unique identifier for a post, not necessarily a URL, used as the feed GUID.
-	 *
-	 * @var string
-	 */
-	public $guid = '';
-	/**
-	 * A field used for ordering posts.
-	 *
-	 * @var int
-	 */
-	public $menu_order = 0;
-	/**
-	 * The post's type, like post or page.
-	 *
-	 * @var string
-	 */
-	public $post_type = 'post';
-	/**
-	 * An attachment's mime type.
-	 *
-	 * @var string
-	 */
-	public $post_mime_type = '';
-	/**
-	 * Cached comment count.
-	 *
-	 * A numeric string, for compatibility reasons.
-	 *
-	 * @var string
-	 */
-	public $comment_count = 0;
-	/**
-	 * Stores the post object's sanitization level.
-	 *
-	 * Does not correspond to a DB field.
-	 *
-	 * @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 false;
-		$_post = wp_cache_get( $post_id, 'posts' );
-		if ( ! $_post ) {
-			$_post = $wpdb->get_row( $wpdb->prepare( "SELECT * FROM $wpdb->posts WHERE ID = %d LIMIT 1", $post_id ) );
-			if ( ! $_post )
-				return false;
-			$_post = sanitize_post( $_post, 'raw' );
-			wp_cache_add( $_post->ID, $_post, 'posts' );
-		} elseif ( empty( $_post->filter ) ) {
-			$_post = sanitize_post( $_post, 'raw' );
-		}
-		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 ( 'page' == $this->post_type );
-		if ( 'post_category' == $key )
-		   return true;
-		if ( 'tags_input' == $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 );
-		}
-		if ( 'post_category' == $key ) {
-			if ( is_object_in_taxonomy( $this->post_type, 'category' ) )
-				$terms = get_the_terms( $this, 'category' );
-			if ( empty( $terms ) )
-				return array();
-			return wp_list_pluck( $terms, 'term_id' );
-		}
-		if ( 'tags_input' == $key ) {
-			if ( is_object_in_taxonomy( $this->post_type, 'post_tag' ) )
-				$terms = get_the_terms( $this, 'post_tag' );
-			if ( empty( $terms ) )
-				return array();
-			return wp_list_pluck( $terms, 'name' );
-		}
-		// Rest of the values need filtering.
-		if ( 'ancestors' == $key )
-			$value = get_post_ancestors( $this );
-		else
-			$value = get_post_meta( $this->ID, $key, true );
-		if ( $this->filter )
-			$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 ) )
-				$post[ $key ] = $this->__get( $key );
-		}
-		return $post;
-	}
-}
-/**
 * Retrieve ancestors of a post.
 *
 * @since 2.5.0
 *
 * @param int|WP_Post $post Post ID or post object.
 *
 * The context values are based off of the taxonomy filter functions and
 * supported values are found within those functions.
 *
 * @since 2.3.0
+* @since 4.5.0 The `$post` parameter was made optional.
 *
 * @see sanitize_post_field()
 *
 * @param string      $field   Post field name.
-* @param int|WP_Post $post    Post ID or post object.
+* @param int|WP_Post $post    Optional. Post ID or post object. Defaults to current post.
 * @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' ) {
+function get_post_field( $field, $post = null, $context = 'display' ) {
 	$post = get_post( $post );
 	if ( !$post )
 		return '';
 			}
 		}
 	}
-	return $post->post_status;
+	/**
+	 * Filters the post status.
+	 *
+	 * @since 4.4.0
+	 *
+	 * @param string  $post_status The post status.
+	 * @param WP_Post $post        The post object.
+	 */
+	return apply_filters( 'get_post_status', $post->post_status, $post );
 }
 /**
 * Retrieve all of the WordPress supported post statuses.
 *
 	return $status;
 }
 /**
+* Return statuses for privacy requests.
+*
+* @since 5.0.0
+*
+* @return array
+*/
+function _wp_privacy_statuses() {
+	return array(
+		'request-pending'   => __( 'Pending' ),      // Pending confirmation from user.
+		'request-confirmed' => __( 'Confirmed' ),    // User has confirmed the action.
+		'request-failed'    => __( 'Failed' ),       // User failed to confirm the action.
+		'request-completed' => __( 'Completed' ),    // Admin has handled the request.
+	);
+}
+/**
 * Register a post status. Do not use before init.
 *
 * 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.
 *
 * Arguments prefixed with an _underscore shouldn't be used by plugins and themes.
 *
 * @since 3.0.0
-* @uses $wp_post_statuses Inserts new post status object into the list
+* @global array $wp_post_statuses Inserts new post status object into the list
 *
 * @param string $post_status Name of the post status.
 * @param array|string $args {
 *     Optional. Array or string of post status arguments.
 *
 *     @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.
+*                                                  in the front end of the site. Default false.
 *     @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.
 *     @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.
 * }
+* @return object
 */
 function register_post_status( $post_status, $args = array() ) {
 	global $wp_post_statuses;
 	if (!is_array($wp_post_statuses))
 	if ( false === $args->label )
 		$args->label = $post_status;
 	if ( false === $args->label_count )
-		$args->label_count = array( $args->label, $args->label );
+		$args->label_count = _n_noop( $args->label, $args->label );
 	$wp_post_statuses[$post_status] = $args;
 	return $args;
 }
 * @global array $wp_post_statuses List of post statuses.
 *
 * @see register_post_status()
 *
 * @param string $post_status The name of a registered post status.
-* @return object A post status object.
+* @return object|null A post status object.
 */
 function get_post_status_object( $post_status ) {
 	global $wp_post_statuses;
 	if ( empty($wp_post_statuses[$post_status]) )
 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.
+* Retrieves the post type of the current post or of a given post.
 *
 * @since 2.1.0
 *
-* @param int|WP_Post $post Optional. Post ID or post object. Default is global $post.
+* @param int|WP_Post|null $post Optional. Post ID or post object. Default is global $post.
-* @return string|false 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.
+* Retrieves a post type object by name.
 *
 * @since 3.0.0
+* @since 4.6.0 Object returned is now an instance of WP_Post_Type.
 *
 * @global array $wp_post_types List of post types.
 *
 * @see register_post_type()
 *
 * @param string $post_type The name of a registered post type.
-* @return object A post type object.
+* @return WP_Post_Type|null WP_Post_Type object if it exists, null otherwise.
 */
 function get_post_type_object( $post_type ) {
 	global $wp_post_types;
-	if ( empty($wp_post_types[$post_type]) )
+	if ( ! is_scalar( $post_type ) || empty( $wp_post_types[ $post_type ] ) ) {
 		return null;
+	}
-	return $wp_post_types[$post_type];
+	return $wp_post_types[ $post_type ];
 }
 /**
 * Get a list of all registered post type objects.
 *
 *                               the post type objects. Default empty array.
 * @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'.
+*                               must match; 'not' means no elements may match. Default 'and'.
 * @return array A list of post type names or objects.
 */
 function get_post_types( $args = array(), $output = 'names', $operator = 'and' ) {
 	global $wp_post_types;
 	return wp_filter_object_list($wp_post_types, $args, $operator, $field);
 }
 /**
-* Register a post type. Do not use before init.
+* Registers a post type.
 *
-* A function for creating or modifying a post type based on the
+* Note: Post type registrations should not be hooked before the
-* parameters given. The function will accept an array (second optional
+* {@see 'init'} action. Also, any taxonomy connections should be
-* parameter), along with a string for the post type name.
+* registered via the `$taxonomies` argument to ensure consistency
+* when hooks such as {@see 'parse_query'} or {@see 'pre_get_posts'}
+* are used.
+*
+* Post types can support any number of built-in core features such
+* as meta boxes, custom fields, post thumbnails, post statuses,
+* comments, and more. See the `$supports` argument for a complete
+* list of supported features.
 *
 * @since 2.9.0
-*
+* @since 3.0.0 The `show_ui` argument is now enforced on the new post screen.
-* @global array      $wp_post_types List of post types.
+* @since 4.4.0 The `show_ui` argument is now enforced on the post type listing
-* @global WP_Rewrite $wp_rewrite    Used for default feeds.
+*              screen and post editing screen.
-* @global WP         $wp            Used to add query vars.
+* @since 4.6.0 Post type object returned is now an instance of WP_Post_Type.
-*
+* @since 4.7.0 Introduced `show_in_rest`, 'rest_base' and 'rest_controller_class'
-* @param string $post_type Post type key, must not exceed 20 characters.
+*              arguments to register the post type in REST API.
+*
+* @global array $wp_post_types List of post types.
+*
+* @param string $post_type Post type key. Must not exceed 20 characters and may
+*                          only contain lowercase alphanumeric characters, dashes,
+*                          and underscores. See sanitize_key().
 * @param array|string $args {
 *     Array or string of arguments for registering a post type.
 *
-*     @type string      $label                Name of the post type shown in the menu. Usually plural.
+*     @type string      $label                 Name of the post type shown in the menu. Usually plural.
-*                                             Default is value of $labels['name'].
+*                                              Default is value of $labels['name'].
-*     @type array       $labels               An array of labels for this post type. If not set, post
+*     @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 are inherited for non-hierarchical types and page
-*                                             labels for hierarchical ones. {@see get_post_type_labels()}.
+*                                              labels for hierarchical ones. See get_post_type_labels() for a full
-*     @type string      $description          A short descriptive summary of what the post type is.
+*                                              list of supported labels.
-*                                             Default empty.
+*     @type string      $description           A short descriptive summary of what the post type is.
-*     @type bool        $public               Whether a post type is intended for use publicly either via
+*                                              Default empty.
-*                                             the admin interface or by front-end users. While the default
+*     @type bool        $public                Whether a post type is intended for use publicly either via
-*                                             settings of $exclude_from_search, $publicly_queryable, $show_ui,
+*                                              the admin interface or by front-end users. While the default
-*                                             and $show_in_nav_menus are inherited from public, each does not
+*                                              settings of $exclude_from_search, $publicly_queryable, $show_ui,
-*                                             rely on this relationship and controls a very specific intention.
+*                                              and $show_in_nav_menus are inherited from public, each does not
-*                                             Default false.
+*                                              rely on this relationship and controls a very specific intention.
-*     @type bool        $hierarchical         Whether the post type is hierarchical (e.g. page). Default false.
+*                                              Default false.
-*     @type bool        $exclude_from_search  Whether to exclude posts with this post type from front end search
+*     @type bool        $hierarchical          Whether the post type is hierarchical (e.g. page). Default false.
-*                                             results. Default is the opposite value of $public.
+*     @type bool        $exclude_from_search   Whether to exclude posts with this post type from front end search
-*     @type bool        $publicly_queryable   Whether queries can be performed on the front end for the post type
+*                                              results. Default is the opposite value of $public.
-*                                             as part of {@see parse_request()}. Endpoints would include:
+*     @type bool        $publicly_queryable    Whether queries can be performed on the front end for the post type
-*                                             * ?post_type={post_type_key}
+*                                              as part of parse_request(). Endpoints would include:
-*                                             * ?{post_type_key}={single_post_slug}
+*                                              * ?post_type={post_type_key}
-*                                             * ?{post_type_query_var}={single_post_slug}
+*                                              * ?{post_type_key}={single_post_slug}
-*                                             If not set, the default is inherited from $public.
+*                                              * ?{post_type_query_var}={single_post_slug}
-*     @type bool        $show_ui              Whether to generate a default UI for managing this post type in the
+*                                              If not set, the default is inherited from $public.
-*                                             admin. Default is value of $public.
+*     @type bool        $show_ui               Whether to generate and allow a UI for managing this post type in the
-*     @type bool        $show_in_menu         Where to show the post type in the admin menu. To work, $show_ui
+*                                              admin. Default is value of $public.
-*                                             must be true. If true, the post type is shown in its own top level
+*     @type bool        $show_in_menu          Where to show the post type in the admin menu. To work, $show_ui
-*                                             menu. If false, no menu is shown. If a string of an existing top
+*                                              must be true. If true, the post type is shown in its own top level
-*                                             level menu (eg. 'tools.php' or 'edit.php?post_type=page'), the post
+*                                              menu. If false, no menu is shown. If a string of an existing top
-*                                             type will be placed as a sub-menu of that.
+*                                              level menu (eg. 'tools.php' or 'edit.php?post_type=page'), the post
-*                                             Default is value of $show_ui.
+*                                              type will be placed as a sub-menu of that.
-*     @type bool        $show_in_nav_menus    Makes this post type available for selection in navigation menus.
+*                                              Default is value of $show_ui.
-*                                             Default is value $public.
+*     @type bool        $show_in_nav_menus     Makes this post type available for selection in navigation menus.
-*     @type bool        $show_in_admin_bar    Makes this post type available via the admin bar. Default is value
+*                                              Default is value $public.
-*                                             of $show_in_menu.
+*     @type bool        $show_in_admin_bar     Makes this post type available via the admin bar. Default is value
-*     @type int         $menu_position        The position in the menu order the post type should appear. To work,
+*                                              of $show_in_menu.
-*                                             $show_in_menu must be true. Default null (at the bottom).
+*     @type bool        $show_in_rest          Whether to add the post type route in the REST API 'wp/v2' namespace.
-*     @type string      $menu_icon            The url to the icon to be used for this menu. Pass a base64-encoded
+*     @type string      $rest_base             To change the base url of REST API route. Default is $post_type.
-*                                             SVG using a data URI, which will be colored to match the color scheme
+*     @type string      $rest_controller_class REST API Controller class name. Default is 'WP_REST_Posts_Controller'.
-*                                             -- this should begin with 'data:image/svg+xml;base64,'. Pass the name
+*     @type int         $menu_position         The position in the menu order the post type should appear. To work,
-*                                             of a Dashicons helper class to use a font icon, e.g.
+*                                              $show_in_menu must be true. Default null (at the bottom).
-*                                             'dashicons-chart-pie'. Pass 'none' to leave div.wp-menu-image empty
+*     @type string      $menu_icon             The url to the icon to be used for this menu. Pass a base64-encoded
-*                                             so an icon can be added via CSS. Defaults to use the posts icon.
+*                                              SVG using a data URI, which will be colored to match the color scheme
-*     @type string      $capability_type      The string to use to build the read, edit, and delete capabilities.
+*                                              -- this should begin with 'data:image/svg+xml;base64,'. Pass the name
-*                                             May be passed as an array to allow for alternative plurals when using
+*                                              of a Dashicons helper class to use a font icon, e.g.
-*                                             this argument as a base to construct the capabilities, e.g.
+*                                              'dashicons-chart-pie'. Pass 'none' to leave div.wp-menu-image empty
-*                                             array('story', 'stories'). Default 'post'.
+*                                              so an icon can be added via CSS. Defaults to use the posts icon.
-*     @type array       $capabilities         Array of capabilities for this post type. $capability_type is used
+*     @type string      $capability_type       The string to use to build the read, edit, and delete capabilities.
-*                                             as a base to construct capabilities by default.
+*                                              May be passed as an array to allow for alternative plurals when using
-*                                             {@see get_post_type_capabilities()}.
+*                                              this argument as a base to construct the capabilities, e.g.
-*     @type bool        $map_meta_cap         Whether to use the internal default meta capability handling.
+*                                              array('story', 'stories'). Default 'post'.
-*                                             Default false.
+*     @type array       $capabilities          Array of capabilities for this post type. $capability_type is used
-*     @type array       $supports             An alias for calling {@see add_post_type_support()} directly.
+*                                              as a base to construct capabilities by default.
-*                                             Defaults to array containing 'title' & 'editor'.
+*                                              See get_post_type_capabilities().
-*     @type callback    $register_meta_box_cb Provide a callback function that sets up the meta boxes for the
+*     @type bool        $map_meta_cap          Whether to use the internal default meta capability handling.
-*                                             edit form. Do remove_meta_box() and add_meta_box() calls in the
+*                                              Default false.
-*                                             callback. Default null.
+*     @type array       $supports              Core feature(s) the post type supports. Serves as an alias for calling
-*     @type array       $taxonomies           An array of taxonomy identifiers that will be registered for the
+*                                              add_post_type_support() directly. Core features include 'title',
-*                                             post type. Taxonomies can be registered later with
+*                                              'editor', 'comments', 'revisions', 'trackbacks', 'author', 'excerpt',
-*                                             {@see register_taxonomy()} or {@see register_taxonomy_for_object_type()}.
+*                                              'page-attributes', 'thumbnail', 'custom-fields', and 'post-formats'.
-*                                             Default empty array.
+*                                              Additionally, the 'revisions' feature dictates whether the post type
-*     @type bool|string $has_archive          Whether there should be post type archives, or if a string, the
+*                                              will store revisions, and the 'comments' feature dictates whether the
-*                                             archive slug to use. Will generate the proper rewrite rules if
+*                                              comments count will show on the edit screen. Defaults is an array
-*                                             $rewrite is enabled. Default false.
+*                                              containing 'title' and 'editor'.
+*     @type callable    $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 register_taxonomy()
+*                                              or 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 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
+*     @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
+*                                              key. If false, a post type cannot be loaded at
-*                                             ?{query_var}={post_slug}. If specified as a string, the query
+*                                              ?{query_var}={post_slug}. If specified as a string, the query
-*                                             ?{query_var_string}={post_slug} will be valid.
+*                                              ?{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        $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,
+*     @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
+*                                              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
+*                                              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),
+*                                              to the user will *not* be trashed or deleted. If not set (the default),
-*                                             posts are trashed if post_type_supports('author'). Otherwise posts
+*                                              posts are trashed if post_type_supports('author'). Otherwise posts
-*                                             are not trashed or deleted. Default null.
+*                                              are not trashed or deleted. Default null.
-*     @type bool        $_builtin             FOR INTERNAL USE ONLY! True if this post type is a native or
+*     @type bool        $_builtin              FOR INTERNAL USE ONLY! True if this post type is a native or
-*                                             "built-in" post_type. Default false.
+*                                              "built-in" post_type. Default false.
-*     @type string      $_edit_link           FOR INTERNAL USE ONLY! URL segment to use for edit link of
+*     @type string      $_edit_link            FOR INTERNAL USE ONLY! URL segment to use for edit link of
-*                                             this post type. Default 'post.php?post=%d'.
+*                                              this post type. Default 'post.php?post=%d'.
 * }
-* @return object|WP_Error The registered post type object, or an error object.
+* @return WP_Post_Type|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;
+	global $wp_post_types;
-	if ( ! is_array( $wp_post_types ) )
+	if ( ! is_array( $wp_post_types ) ) {
 		$wp_post_types = array();
+	}
-	// Args prefixed with an underscore are reserved for internal use.
-	$defaults = array(
+	// Sanitize post type name
-		'labels'               => array(),
-		'description'          => '',
-		'public'               => false,
-		'hierarchical'         => false,
-		'exclude_from_search'  => null,
-		'publicly_queryable'   => null,
-		'show_ui'              => null,
-		'show_in_menu'         => null,
-		'show_in_nav_menus'    => null,
-		'show_in_admin_bar'    => null,
-		'menu_position'        => null,
-		'menu_icon'            => null,
-		'capability_type'      => 'post',
-		'capabilities'         => array(),
-		'map_meta_cap'         => null,
-		'supports'             => array(),
-		'register_meta_box_cb' => null,
-		'taxonomies'           => array(),
-		'has_archive'          => false,
-		'rewrite'              => true,
-		'query_var'            => true,
-		'can_export'           => true,
-		'delete_with_user'     => null,
-		'_builtin'             => false,
-		'_edit_link'           => 'post.php?post=%d',
-	);
-	$args = wp_parse_args( $args, $defaults );
-	$args = (object) $args;
 	$post_type = sanitize_key( $post_type );
-	$args->name = $post_type;
 	if ( empty( $post_type ) || strlen( $post_type ) > 20 ) {
-		_doing_it_wrong( __FUNCTION__, __( 'Post type names must be between 1 and 20 characters in length.' ), '4.2' );
+		_doing_it_wrong( __FUNCTION__, __( 'Post type names must be between 1 and 20 characters in length.' ), '4.2.0' );
 		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.
+	$post_type_object = new WP_Post_Type( $post_type, $args );
-	if ( null === $args->publicly_queryable )
+	$post_type_object->add_supports();
-		$args->publicly_queryable = $args->public;
+	$post_type_object->add_rewrite_rules();
+	$post_type_object->register_meta_boxes();
-	// If not set, default to the setting for public.
-	if ( null === $args->show_ui )
+	$wp_post_types[ $post_type ] = $post_type_object;
-		$args->show_ui = $args->public;
+	$post_type_object->add_hooks();
-	// If not set, default to the setting for show_ui.
+	$post_type_object->register_taxonomies();
-	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 = (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.
-	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 )
-		$args->map_meta_cap = false;
-	$args->cap = get_post_type_capabilities( $args );
-	unset( $args->capabilities );
-	if ( is_array( $args->capability_type ) )
-		$args->capability_type = $args->capability_type[0];
-	if ( ! empty( $args->supports ) ) {
-		add_post_type_support( $post_type, $args->supports );
-		unset( $args->supports );
-	} elseif ( false !== $args->supports ) {
-		// Add default features
-		add_post_type_support( $post_type, array( 'title', 'editor' ) );
-	}
-	if ( false !== $args->query_var && ! empty( $wp ) ) {
-		if ( true === $args->query_var )
-			$args->query_var = $post_type;
-		else
-			$args->query_var = sanitize_title_with_dashes( $args->query_var );
-		$wp->add_query_var( $args->query_var );
-	}
-	if ( false !== $args->rewrite && ( is_admin() || '' != get_option( 'permalink_structure' ) ) ) {
-		if ( ! is_array( $args->rewrite ) )
-			$args->rewrite = array();
-		if ( empty( $args->rewrite['slug'] ) )
-			$args->rewrite['slug'] = $post_type;
-		if ( ! isset( $args->rewrite['with_front'] ) )
-			$args->rewrite['with_front'] = true;
-		if ( ! isset( $args->rewrite['pages'] ) )
-			$args->rewrite['pages'] = true;
-		if ( ! isset( $args->rewrite['feeds'] ) || ! $args->has_archive )
-			$args->rewrite['feeds'] = (bool) $args->has_archive;
-		if ( ! isset( $args->rewrite['ep_mask'] ) ) {
-			if ( isset( $args->permalink_epmask ) )
-				$args->rewrite['ep_mask'] = $args->permalink_epmask;
-			else
-				$args->rewrite['ep_mask'] = EP_PERMALINK;
-		}
-		if ( $args->hierarchical )
-			add_rewrite_tag( "%$post_type%", '(.+?)', $args->query_var ? "{$args->query_var}=" : "post_type=$post_type&pagename=" );
-		else
-			add_rewrite_tag( "%$post_type%", '([^/]+)', $args->query_var ? "{$args->query_var}=" : "post_type=$post_type&name=" );
-		if ( $args->has_archive ) {
-			$archive_slug = $args->has_archive === true ? $args->rewrite['slug'] : $args->has_archive;
-			if ( $args->rewrite['with_front'] )
-				$archive_slug = substr( $wp_rewrite->front, 1 ) . $archive_slug;
-			else
-				$archive_slug = $wp_rewrite->root . $archive_slug;
-			add_rewrite_rule( "{$archive_slug}/?$", "index.php?post_type=$post_type", 'top' );
-			if ( $args->rewrite['feeds'] && $wp_rewrite->feeds ) {
-				$feeds = '(' . trim( implode( '|', $wp_rewrite->feeds ) ) . ')';
-				add_rewrite_rule( "{$archive_slug}/feed/$feeds/?$", "index.php?post_type=$post_type" . '&feed=$matches[1]', 'top' );
-				add_rewrite_rule( "{$archive_slug}/$feeds/?$", "index.php?post_type=$post_type" . '&feed=$matches[1]', 'top' );
-			}
-			if ( $args->rewrite['pages'] )
-				add_rewrite_rule( "{$archive_slug}/{$wp_rewrite->pagination_base}/([0-9]{1,})/?$", "index.php?post_type=$post_type" . '&paged=$matches[1]', 'top' );
-		}
-		$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;
-	$wp_post_types[ $post_type ] = $args;
-	add_action( 'future_' . $post_type, '_future_post_hook', 5, 2 );
-	foreach ( $args->taxonomies as $taxonomy ) {
-		register_taxonomy_for_object_type( $taxonomy, $post_type );
-	}
 	/**
 	 * Fires after a post type is registered.
 	 *
 	 * @since 3.3.0
-	 *
+	 * @since 4.6.0 Converted the `$post_type` parameter to accept a WP_Post_Type object.
-	 * @param string $post_type Post type.
+	 *
-	 * @param object $args      Arguments used to register the post type.
+	 * @param string       $post_type        Post type.
+	 * @param WP_Post_Type $post_type_object Arguments used to register the post type.
 	 */
-	do_action( 'registered_post_type', $post_type, $args );
+	do_action( 'registered_post_type', $post_type, $post_type_object );
-	return $args;
+	return $post_type_object;
+}
+/**
+* Unregisters a post type.
+*
+* Can not be used to unregister built-in post types.
+*
+* @since 4.5.0
+*
+* @global array $wp_post_types List of post types.
+*
+* @param string $post_type Post type to unregister.
+* @return bool|WP_Error True on success, WP_Error on failure or if the post type doesn't exist.
+*/
+function unregister_post_type( $post_type ) {
+	global $wp_post_types;
+	if ( ! post_type_exists( $post_type ) ) {
+		return new WP_Error( 'invalid_post_type', __( 'Invalid post type.' ) );
+	}
+	$post_type_object = get_post_type_object( $post_type );
+	// Do not allow unregistering internal post types.
+	if ( $post_type_object->_builtin ) {
+		return new WP_Error( 'invalid_post_type', __( 'Unregistering a built-in post type is not allowed' ) );
+	}
+	$post_type_object->remove_supports();
+	$post_type_object->remove_rewrite_rules();
+	$post_type_object->unregister_meta_boxes();
+	$post_type_object->remove_hooks();
+	$post_type_object->unregister_taxonomies();
+	unset( $wp_post_types[ $post_type ] );
+	/**
+	 * Fires after a post type was unregistered.
+	 *
+	 * @since 4.5.0
+	 *
+	 * @param string $post_type Post type key.
+	 */
+	do_action( 'unregistered_post_type', $post_type );
+	return true;
 }
 /**
 * Build an object with all post type capabilities out of a post type object
 *
 *
 * @see register_post_type()
 * @see map_meta_cap()
 *
 * @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' );
 * 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.
+* @global array $post_type_meta_caps Used to store meta capabilities.
+*
+* @param array $capabilities Post type meta capabilities.
 */
 function _post_type_meta_capabilities( $capabilities = null ) {
-	static $meta_caps = array();
+	global $post_type_meta_caps;
-	if ( null === $capabilities )
-		return $meta_caps;
 	foreach ( $capabilities as $core => $custom ) {
-		if ( in_array( $core, array( 'read_post', 'delete_post', 'edit_post' ) ) )
+		if ( in_array( $core, array( 'read_post', 'delete_post', 'edit_post' ) ) ) {
-			$meta_caps[ $custom ] = $core;
+			$post_type_meta_caps[ $custom ] = $core;
-	}
+		}
-}
+	}
+}
-/**
-* Build an object with all post type labels out of a post type object
+/**
+* Builds 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
+* - `name` - General name for the post type, usually plural. The same and overridden
-*          by $post_type_object->label. Default is Posts/Pages
+*          by `$post_type_object->label`. Default is 'Posts' / 'Pages'.
-* - singular_name - name for one object of this post type. Default is Post/Page
+* - `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.
+* - `add_new` - Default is 'Add New' for both hierarchical and non-hierarchical types.
-*             When internationalizing this string, please use a gettext context
+*             When internationalizing this string, please use a {@link https://codex.wordpress.org/I18n_for_WordPress_Developers#Disambiguation_by_context gettext context}
-*             {@link https://codex.wordpress.org/I18n_for_WordPress_Developers#Disambiguation_by_context}
+*             matching your post type. Example: `_x( 'Add New', 'product', 'textdomain' );`.
-*             matching your post type. Example: `_x( 'Add New', 'product' );`.
+* - `add_new_item` - Label for adding a new singular item. Default is 'Add New Post' / 'Add New Page'.
-* - add_new_item - Default is Add New Post/Add New Page.
+* - `edit_item` - Label for editing a singular item. Default is 'Edit Post' / 'Edit Page'.
-* - edit_item - Default is Edit Post/Edit Page.
+* - `new_item` - Label for the new item page title. Default is 'New Post' / 'New Page'.
-* - new_item - Default is New Post/New Page.
+* - `view_item` - Label for viewing a singular item. Default is 'View Post' / 'View Page'.
-* - view_item - Default is View Post/View Page.
+* - `view_items` - Label for viewing post type archives. Default is 'View Posts' / 'View Pages'.
-* - search_items - Default is Search Posts/Search Pages.
+* - `search_items` - Label for searching plural items. Default is 'Search Posts' / 'Search Pages'.
-* - not_found - Default is No posts found/No pages found.
+* - `not_found` - Label used when no items are found. Default is 'No posts found' / 'No pages found'.
-* - not_found_in_trash - Default is No posts found in Trash/No pages found in Trash.
+* - `not_found_in_trash` - Label used when no items are in the trash. Default is 'No posts found in Trash' /
-* - parent_item_colon - This string isn't used on non-hierarchical types. In hierarchical
+*                        'No pages found in Trash'.
-*                       ones the default is 'Parent Page:'.
+* - `parent_item_colon` - Label used to prefix parents of hierarchical items. Not used on non-hierarchical
-* - all_items - String for the submenu. Default is All Posts/All Pages.
+*                       post types. Default is 'Parent Page:'.
-* - menu_name - Default is the same as `name`.
+* - `all_items` - Label to signify all items in a submenu link. Default is 'All Posts' / 'All Pages'.
+* - `archives` - Label for archives in nav menus. Default is 'Post Archives' / 'Page Archives'.
+* - `attributes` - Label for the attributes meta box. Default is 'Post Attributes' / 'Page Attributes'.
+* - `insert_into_item` - Label for the media frame button. Default is 'Insert into post' / 'Insert into page'.
+* - `uploaded_to_this_item` - Label for the media frame filter. Default is 'Uploaded to this post' /
+*                           'Uploaded to this page'.
+* - `featured_image` - Label for the Featured Image meta box title. Default is 'Featured Image'.
+* - `set_featured_image` - Label for setting the featured image. Default is 'Set featured image'.
+* - `remove_featured_image` - Label for removing the featured image. Default is 'Remove featured image'.
+* - `use_featured_image` - Label in the media frame for using a featured image. Default is 'Use as featured image'.
+* - `menu_name` - Label for the menu name. Default is the same as `name`.
+* - `filter_items_list` - Label for the table views hidden heading. Default is 'Filter posts list' /
+*                       'Filter pages list'.
+* - `items_list_navigation` - Label for the table pagination hidden heading. Default is 'Posts list navigation' /
+*                           'Pages list navigation'.
+* - `items_list` - Label for the table hidden heading. Default is 'Posts list' / 'Pages list'.
 *
 * Above, the first default value is for non-hierarchical post types (like posts)
 * and the second one is for hierarchical post types (like pages).
 *
+* Note: To set labels used in post type admin notices, see the {@see 'post_updated_messages'} filter.
+*
 * @since 3.0.0
+* @since 4.3.0 Added the `featured_image`, `set_featured_image`, `remove_featured_image`,
+*              and `use_featured_image` labels.
+* @since 4.4.0 Added the `archives`, `insert_into_item`, `uploaded_to_this_item`, `filter_items_list`,
+*              `items_list_navigation`, and `items_list` labels.
+* @since 4.6.0 Converted the `$post_type` parameter to accept a WP_Post_Type object.
+* @since 4.7.0 Added the `view_items` and `attributes` labels.
+*
 * @access private
 *
-* @param object $post_type_object Post type object.
+* @param object|WP_Post_Type $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') ),
 		'add_new' => array( _x('Add New', 'post'), _x('Add New', 'page') ),
 		'add_new_item' => array( __('Add New Post'), __('Add New Page') ),
 		'edit_item' => array( __('Edit Post'), __('Edit Page') ),
 		'new_item' => array( __('New Post'), __('New Page') ),
 		'view_item' => array( __('View Post'), __('View Page') ),
+		'view_items' => array( __('View Posts'), __('View Pages') ),
 		'search_items' => array( __('Search Posts'), __('Search Pages') ),
 		'not_found' => array( __('No posts found.'), __('No pages found.') ),
 		'not_found_in_trash' => array( __('No posts found in Trash.'), __('No pages found in Trash.') ),
 		'parent_item_colon' => array( null, __('Parent Page:') ),
-		'all_items' => array( __( 'All Posts' ), __( 'All Pages' ) )
+		'all_items' => array( __( 'All Posts' ), __( 'All Pages' ) ),
+		'archives' => array( __( 'Post Archives' ), __( 'Page Archives' ) ),
+		'attributes' => array( __( 'Post Attributes' ), __( 'Page Attributes' ) ),
+		'insert_into_item' => array( __( 'Insert into post' ), __( 'Insert into page' ) ),
+		'uploaded_to_this_item' => array( __( 'Uploaded to this post' ), __( 'Uploaded to this page' ) ),
+		'featured_image' => array( _x( 'Featured Image', 'post' ), _x( 'Featured Image', 'page' ) ),
+		'set_featured_image' => array( _x( 'Set featured image', 'post' ), _x( 'Set featured image', 'page' ) ),
+		'remove_featured_image' => array( _x( 'Remove featured image', 'post' ), _x( 'Remove featured image', 'page' ) ),
+		'use_featured_image' => array( _x( 'Use as featured image', 'post' ), _x( 'Use as featured image', 'page' ) ),
+		'filter_items_list' => array( __( 'Filter posts list' ), __( 'Filter pages list' ) ),
+		'items_list_navigation' => array( __( 'Posts list navigation' ), __( 'Pages list navigation' ) ),
+		'items_list' => array( __( 'Posts list' ), __( 'Pages list' ) ),
 	);
 	$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;
+	$default_labels = clone $labels;
 	/**
-	 * Filter the labels of a specific post type.
+	 * Filters the labels of a specific post type.
 	 *
 	 * The dynamic portion of the hook name, `$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.
+	 * @param object $labels Object with labels for the post type as member variables.
 	 */
-	return apply_filters( "post_type_labels_{$post_type}", $labels );
+	$labels = apply_filters( "post_type_labels_{$post_type}", $labels );
+	// Ensure that the filtered labels contain all required default values.
+	$labels = (object) array_merge( (array) $default_labels, (array) $labels );
+	return $labels;
 }
 /**
 * Build an object with custom-something object (post type, taxonomy) labels
 * out of a custom-something object
 * @since 3.0.0
 * @access private
 *
 * @param object $object                  A custom-something object.
 * @param array  $nohier_vs_hier_defaults Hierarchical vs non-hierarchical default labels.
+* @return object Object containing labels for the given custom-something object.
 */
 function _get_custom_object_labels( $object, $nohier_vs_hier_defaults ) {
 	$object->labels = (array) $object->labels;
 	if ( isset( $object->label ) && empty( $object->labels['name'] ) )
 	if ( !isset( $object->labels['menu_name'] ) && isset( $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'];
+	if ( !isset( $object->labels['archives'] ) && isset( $object->labels['all_items'] ) ) {
+		$object->labels['archives'] = $object->labels['all_items'];
+	}
 	$defaults = array();
 	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;
+	$object->labels = (object) $object->labels;
+	return (object) $labels;
 }
 /**
 * Add submenus for post types.
 *
 * store revisions, and the 'comments' feature dictates whether the comments
 * count will show on the edit screen.
 *
 * @since 3.0.0
 *
+* @global array $_wp_post_type_features
+*
 * @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 ) {
 /**
 * Remove support for a feature from a post type.
 *
 * @since 3.0.0
 *
+* @global array $_wp_post_type_features
+*
 * @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] ) )
+	unset( $_wp_post_type_features[ $post_type ][ $feature ] );
-		unset( $_wp_post_type_features[$post_type][$feature] );
 }
 /**
 * Get all the post type features
 *
 * @since 3.4.0
+*
+* @global array $_wp_post_type_features
 *
 * @param string $post_type The post type.
 * @return array Post type supports list.
 */
 function get_all_post_type_supports( $post_type ) {
 /**
 * Check a post type's support for a given feature.
 *
 * @since 3.0.0
 *
+* @global array $_wp_post_type_features
+*
 * @param string $post_type The post type being checked.
-* @param string $feature the feature being checked.
+* @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] ) );
+}
+/**
+* Retrieves a list of post type names that support a specific feature.
+*
+* @since 4.5.0
+*
+* @global array $_wp_post_type_features Post type features
+*
+* @param array|string $feature  Single feature or an array of features the post types should support.
+* @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; 'not' means no elements may
+*                               match. Default 'and'.
+* @return array A list of post type names.
+*/
+function get_post_types_by_support( $feature, $operator = 'and' ) {
+	global $_wp_post_type_features;
+	$features = array_fill_keys( (array) $feature, true );
+	return array_keys( wp_filter_object_list( $_wp_post_type_features, $features, $operator ) );
 }
 /**
 * Update the post type for the post ID.
 *
 * @global wpdb $wpdb WordPress database abstraction object.
 *
 * @param int    $post_id   Optional. Post ID to change post type. Default 0.
 * @param string $post_type Optional. Post type. Accepts 'post' or 'page' to
 *                          name a few. Default 'post'.
-* @return int Amount of rows changed. Should be 1 for success and 0 for failure.
+* @return int|false 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;
 	$post_type = sanitize_post_field('post_type', $post_type, $post_id, 'db');
 	return $return;
 }
 /**
+* Determines whether a post type is considered "viewable".
+*
+* For built-in post types such as posts and pages, the 'public' value will be evaluated.
+* For all others, the 'publicly_queryable' value will be used.
+*
+* @since 4.4.0
+* @since 4.5.0 Added the ability to pass a post type name in addition to object.
+* @since 4.6.0 Converted the `$post_type` parameter to accept a WP_Post_Type object.
+*
+* @param string|WP_Post_Type $post_type Post type name or object.
+* @return bool Whether the post type should be considered viewable.
+*/
+function is_post_type_viewable( $post_type ) {
+	if ( is_scalar( $post_type ) ) {
+		$post_type = get_post_type_object( $post_type );
+		if ( ! $post_type ) {
+			return false;
+		}
+	}
+	return $post_type->publicly_queryable || ( $post_type->_builtin && $post_type->public );
+}
+/**
 * Retrieve list of latest posts or posts matching criteria.
 *
 * The defaults are as follows:
 *
 * @since 1.2.0
 *
 * @see WP_Query::parse_query()
 *
 * @param array $args {
-*     Optional. Arguments to retrieve posts. {@see WP_Query::parse_query()} for more
+*     Optional. Arguments to retrieve posts. See WP_Query::parse_query() for all
 *     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.
+*                                        in WP_Query. Accepts -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 ) {
 	$defaults = array(
-		'numberposts' => 5, 'offset' => 0,
+		'numberposts' => 5,
 		'category' => 0, 'orderby' => 'date',
 		'order' => 'DESC', 'include' => array(),
 		'exclude' => array(), 'meta_key' => '',
 		'meta_value' =>'', 'post_type' => 'post',
 		'suppress_filters' => true
 * @param int    $post_id    Post ID.
 * @param string $meta_key   Metadata name.
 * @param mixed  $meta_value Metadata value. Must be serializable if non-scalar.
 * @param bool   $unique     Optional. Whether the same key should not be added.
 *                           Default false.
-* @return int|bool Meta ID on success, false on failure.
+* @return int|false Meta ID on success, false on failure.
 */
 function add_post_meta( $post_id, $meta_key, $meta_value, $unique = false ) {
 	// 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);
+	$added = add_metadata( 'post', $post_id, $meta_key, $meta_value, $unique );
+	if ( $added ) {
+		wp_cache_set( 'last_changed', microtime(), 'posts' );
+	}
+	return $added;
 }
 /**
 * Remove metadata matching criteria from a post.
 *
 function delete_post_meta( $post_id, $meta_key, $meta_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 delete_metadata('post', $post_id, $meta_key, $meta_value);
+	$deleted = delete_metadata( 'post', $post_id, $meta_key, $meta_value );
+	if ( $deleted ) {
+		wp_cache_set( 'last_changed', microtime(), 'posts' );
+	}
+	return $deleted;
 }
 /**
 * Retrieve post meta field for a post.
 *
 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);
+	$updated = update_metadata( 'post', $post_id, $meta_key, $meta_value, $prev_value );
+	if ( $updated ) {
+		wp_cache_set( 'last_changed', microtime(), 'posts' );
+	}
+	return $updated;
 }
 /**
 * Delete everything from post meta matching meta key.
 *
 *
 * @param string $post_meta_key Key to search for when deleting.
 * @return bool Whether the post meta key was deleted from the database.
 */
 function delete_post_meta_by_key( $post_meta_key ) {
-	return delete_metadata( 'post', null, $post_meta_key, '', true );
+	$deleted = delete_metadata( 'post', null, $post_meta_key, '', true );
+	if ( $deleted ) {
+		wp_cache_set( 'last_changed', microtime(), 'posts' );
+	}
+	return $deleted;
+}
+/**
+* Registers a meta key for posts.
+*
+* @since 4.9.8
+*
+* @param string $post_type Post type to register a meta key for. Pass an empty string
+*                          to register the meta key across all existing post types.
+* @param string $meta_key  The meta key to register.
+* @param array  $args      Data used to describe the meta key when registered. See
+*                          {@see register_meta()} for a list of supported arguments.
+* @return bool True if the meta key was successfully registered, false if not.
+*/
+function register_post_meta( $post_type, $meta_key, array $args ) {
+	$args['object_subtype'] = $post_type;
+	return register_meta( 'post', $meta_key, $args );
+}
+/**
+* Unregisters a meta key for posts.
+*
+* @since 4.9.8
+*
+* @param string $post_type Post type the meta key is currently registered for. Pass
+*                          an empty string if the meta key is registered across all
+*                          existing post types.
+* @param string $meta_key  The meta key to unregister.
+* @return bool True on success, false if the meta key was not previously registered.
+*/
+function unregister_post_meta( $post_type, $meta_key ) {
+	return unregister_meta_key( 'post', $meta_key, $post_type );
 }
 /**
 * Retrieve post meta fields, based on post ID.
 *
 * If there are no meta fields, then nothing (null) will be returned.
 *
 * @since 1.2.0
 *
 * @param int $post_id Optional. Post ID. Default is ID of the global $post.
-* @return array|null Either array of the keys, or null if keys could not be
+* @return array|void Array of the keys, if retrieved.
-*                    retrieved.
 */
 function get_post_custom_keys( $post_id = 0 ) {
 	$custom = get_post_custom( $post_id );
 	if ( !is_array($custom) )
 *
 * @since 1.2.0
 *
 * @param string $key     Optional. Meta field key. Default empty.
 * @param int    $post_id Optional. Post ID. Default is ID of the global $post.
-* @return array Meta field values.
+* @return array|null Meta field values.
 */
 function get_post_custom_values( $key = '', $post_id = 0 ) {
 	if ( !$key )
 		return null;
 		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 {
+	} elseif ( is_array( $post ) ) {
 		// Check if post already filtered for this context.
 		if ( isset($post['filter']) && $context == $post['filter'] )
 			return $post;
 		if ( !isset($post['ID']) )
 			$post['ID'] = 0;
 * Possible context values are:  'raw', 'edit', 'db', 'display', 'attribute' and
 * 'js'. The 'display' context is used by default. 'attribute' and 'js' contexts
 * are treated like 'display' when calling filters.
 *
 * @since 2.3.0
+* @since 4.4.0 Like `sanitize_post()`, `$context` defaults to 'display'.
 *
 * @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',
+* @param string $context Optional. How to sanitize post fields. Looks for 'raw', 'edit',
-*                        'db', 'display', 'attribute' and 'js'.
+*                        'db', 'display', 'attribute' and 'js'. Default 'display'.
 * @return mixed Sanitized value.
 */
-function sanitize_post_field($field, $value, $post_id, $context) {
+function sanitize_post_field( $field, $value, $post_id, $context = 'display' ) {
 	$int_fields = array('ID', 'post_parent', 'menu_order');
 	if ( in_array($field, $int_fields) )
 		$value = (int) $value;
 	// Fields which contain arrays of integers.
 		$format_to_edit = array('post_content', 'post_excerpt', 'post_title', 'post_password');
 		if ( $prefixed ) {
 			/**
-			 * Filter the value of a specific post field to edit.
+			 * Filters the value of a specific post field to edit.
 			 *
 			 * The dynamic portion of the hook name, `$field`, refers to the post
 			 * field name.
 			 *
 			 * @since 2.3.0
 			 * @param int   $post_id Post ID.
 			 */
 			$value = apply_filters( "edit_{$field}", $value, $post_id );
 			/**
-			 * Filter the value of a specific post field to edit.
+			 * Filters the value of a specific post field to edit.
 			 *
 			 * The dynamic portion of the hook name, `$field_no_prefix`, refers to
 			 * the post field name.
 			 *
 			 * @since 2.3.0
 		}
 	} elseif ( 'db' == $context ) {
 		if ( $prefixed ) {
 			/**
-			 * Filter the value of a specific post field before saving.
+			 * Filters the value of a specific post field before saving.
 			 *
 			 * The dynamic portion of the hook name, `$field`, refers to the post
 			 * field name.
 			 *
 			 * @since 2.3.0
 			 * @param mixed $value Value of the post field.
 			 */
 			$value = apply_filters( "pre_{$field}", $value );
 			/**
-			 * Filter the value of a specific field before saving.
+			 * Filters the value of a specific field before saving.
 			 *
 			 * The dynamic portion of the hook name, `$field_no_prefix`, refers
 			 * to the post field name.
 			 *
 			 * @since 2.3.0
 			$value = apply_filters( "{$field_no_prefix}_save_pre", $value );
 		} else {
 			$value = apply_filters( "pre_post_{$field}", $value );
 			/**
-			 * Filter the value of a specific post field before saving.
+			 * Filters the value of a specific post field before saving.
 			 *
 			 * The dynamic portion of the hook name, `$field`, refers to the post
 			 * field name.
 			 *
 			 * @since 2.3.0
 		// Use display filters by default.
 		if ( $prefixed ) {
 			/**
-			 * Filter the value of a specific post field for display.
+			 * Filters the value of a specific post field for display.
 			 *
 			 * The dynamic portion of the hook name, `$field`, refers to the post
 			 * field name.
 			 *
 			 * @since 2.3.0
 			 * @param 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 );
+			$value = apply_filters( "{$field}", $value, $post_id, $context );
 		} else {
 			$value = apply_filters( "post_{$field}", $value, $post_id, $context );
 		}
-	}
+		if ( 'attribute' == $context ) {
-	if ( 'attribute' == $context )
+			$value = esc_attr( $value );
-		$value = esc_attr($value);
+		} elseif ( 'js' == $context ) {
-	elseif ( 'js' == $context )
+			$value = esc_js( $value );
-		$value = esc_js($value);
+		}
+	}
 	return $value;
 }
 /**
 		$stickies = array($post_id);
 	if ( ! in_array($post_id, $stickies) )
 		$stickies[] = $post_id;
-	update_option('sticky_posts', $stickies);
+	$updated = update_option( 'sticky_posts', $stickies );
+	if ( $updated ) {
+		/**
+		 * Fires once a post has been added to the sticky list.
+		 *
+		 * @since 4.6.0
+		 *
+		 * @param int $post_id ID of the post that was stuck.
+		 */
+		do_action( 'post_stuck', $post_id );
+	}
 }
 /**
 * Un-stick a post.
 *
 	if ( false === $offset )
 		return;
 	array_splice($stickies, $offset, 1);
-	update_option('sticky_posts', $stickies);
+	$updated = update_option( 'sticky_posts', $stickies );
+	if ( $updated ) {
+		/**
+		 * Fires once a post has been removed from the sticky list.
+		 *
+		 * @since 4.6.0
+		 *
+		 * @param int $post_id ID of the post that was unstuck.
+		 */
+		do_action( 'post_unstuck', $post_id );
+	}
 }
 /**
 * Return the cache key for wp_count_posts() based on the passed arguments.
 *
 *
 * 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.
 *
 * @since 2.5.0
+*
+* @global wpdb $wpdb WordPress database abstraction object.
 *
 * @param string $type Optional. Post type to retrieve count. Default 'post'.
 * @param string $perm Optional. 'readable' or empty. Default empty.
 * @return object Number of posts for each status.
 */
 * 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
 *
+* @global wpdb $wpdb WordPress database abstraction object.
+*
 * @param string|array $mime_type Optional. Array or comma-separated list of
 *                                MIME patterns. Default empty.
 * @return object An object containing the attachment counts by mime type.
 */
 function wp_count_attachments( $mime_type = '' ) {
 	$and = wp_post_mime_type_where( $mime_type );
 	$count = $wpdb->get_results( "SELECT post_mime_type, COUNT( * ) AS num_posts FROM $wpdb->posts WHERE post_type = 'attachment' AND post_status != 'trash' $and GROUP BY post_mime_type", ARRAY_A );
 	$counts = array();
-	foreach( (array) $count as $row ) {
+	foreach ( (array) $count as $row ) {
 		$counts[ $row['post_mime_type'] ] = $row['num_posts'];
 	}
 	$counts['trash'] = $wpdb->get_var( "SELECT COUNT( * ) FROM $wpdb->posts WHERE post_type = 'attachment' AND post_status = 'trash' $and");
 	/**
 		'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>')),
 	);
 	/**
-	 * Filter the default list of post mime types.
+	 * Filters the default list of post mime types.
 	 *
 	 * @since 2.5.0
 	 *
 	 * @param array $post_mime_types Default list of post mime types.
 	 */
 * @see wp_trash_post()
 *
 * @param int  $postid       Optional. Post ID. Default 0.
 * @param bool $force_delete Optional. Whether to bypass trash and force deletion.
 *                           Default false.
-* @return array|bool|WP_Post False on failure.
+* @return WP_Post|false|null Post data on success, false or null 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)) )
+	$post = $wpdb->get_row( $wpdb->prepare( "SELECT * FROM $wpdb->posts WHERE ID = %d", $postid ) );
+	if ( ! $post ) {
 		return $post;
+	}
-	if ( !$force_delete && ( $post->post_type == 'post' || $post->post_type == 'page') && get_post_status( $postid ) != 'trash' && EMPTY_TRASH_DAYS )
-			return wp_trash_post($postid);
+	$post = get_post( $post );
-	if ( $post->post_type == 'attachment' )
+	if ( ! $force_delete && ( 'post' === $post->post_type || 'page' === $post->post_type ) && 'trash' !== get_post_status( $postid ) && EMPTY_TRASH_DAYS ) {
+		return wp_trash_post( $postid );
+	}
+	if ( 'attachment' === $post->post_type ) {
 		return wp_delete_attachment( $postid, $force_delete );
+	}
+	/**
+	 * Filters whether a post deletion should take place.
+	 *
+	 * @since 4.4.0
+	 *
+	 * @param bool    $delete       Whether to go forward with deletion.
+	 * @param WP_Post $post         Post object.
+	 * @param bool    $force_delete Whether to bypass the trash.
+	 */
+	$check = apply_filters( 'pre_delete_post', null, $post, $force_delete );
+	if ( null !== $check ) {
+		return $check;
+	}
 	/**
 	 * Fires before a post is deleted, at the start of wp_delete_post().
 	 *
 	 * @since 3.2.0
 	if ( is_post_type_hierarchical( $post->post_type ) ) {
 		// 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 );
+		if ( $children ) {
-		$wpdb->update( $wpdb->posts, $parent_data, $parent_where + array( 'post_type' => $post->post_type ) );
+			$wpdb->update( $wpdb->posts, $parent_data, $parent_where + array( 'post_type' => $post->post_type ) );
+		}
 	}
 	// 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.
 		wp_delete_post_revision( $revision_id );
 	// Point all attachments to this post up one level.
 	$wpdb->update( $wpdb->posts, $parent_data, $parent_where + array( 'post_type' => 'attachment' ) );
+	wp_defer_comment_counting( true );
 	$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 )
+	foreach ( $comment_ids as $comment_id ) {
 		wp_delete_comment( $comment_id, true );
+	}
+	wp_defer_comment_counting( false );
 	$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 );
 *
 * @see wp_delete_post()
 *
 * @param int $post_id Optional. Post ID. Default is ID of the global $post
 *                     if EMPTY_TRASH_DAYS equals true.
-* @return bool|array Post data array, otherwise false.
+* @return WP_Post|false|null Post data on success, false or null on failure.
 */
 function wp_trash_post( $post_id = 0 ) {
-	if ( !EMPTY_TRASH_DAYS )
+	if ( ! EMPTY_TRASH_DAYS ) {
-		return wp_delete_post($post_id, true);
+		return wp_delete_post( $post_id, true );
+	}
-	if ( !$post = get_post($post_id, ARRAY_A) )
+	$post = get_post( $post_id );
+	if ( ! $post ) {
 		return $post;
+	}
-	if ( $post['post_status'] == 'trash' )
+	if ( 'trash' === $post->post_status ) {
 		return false;
+	}
+	/**
+	 * Filters whether a post trashing should take place.
+	 *
+	 * @since 4.9.0
+	 *
+	 * @param bool    $trash Whether to go forward with trashing.
+	 * @param WP_Post $post  Post object.
+	 */
+	$check = apply_filters( 'pre_trash_post', null, $post );
+	if ( null !== $check ) {
+		return $check;
+	}
 	/**
 	 * 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_status', $post->post_status );
-	add_post_meta($post_id,'_wp_trash_meta_time', time());
+	add_post_meta( $post_id, '_wp_trash_meta_time', time() );
-	$post['post_status'] = 'trash';
+	wp_update_post( array( 'ID' => $post_id, 'post_status' => 'trash' ) );
-	wp_insert_post($post);
+	wp_trash_post_comments( $post_id );
-	wp_trash_post_comments($post_id);
 	/**
 	 * Fires after a post is sent to the trash.
 	 *
 	 * @since 2.9.0
 * Restore a post or page from the Trash.
 *
 * @since 2.9.0
 *
 * @param int $post_id Optional. Post ID. Default is ID of the global $post.
-* @return WP_Post|bool WP_Post object. False on failure.
+* @return WP_Post|false|null Post data on success, false or null on failure.
 */
 function wp_untrash_post( $post_id = 0 ) {
-	if ( !$post = get_post($post_id, ARRAY_A) )
+	$post = get_post( $post_id );
+	if ( ! $post ) {
 		return $post;
+	}
-	if ( $post['post_status'] != 'trash' )
+	if ( 'trash' !== $post->post_status ) {
 		return false;
+	}
+	/**
+	 * Filters whether a post untrashing should take place.
+	 *
+	 * @since 4.9.0
+	 *
+	 * @param bool    $untrash Whether to go forward with untrashing.
+	 * @param WP_Post $post    Post object.
+	 */
+	$check = apply_filters( 'pre_untrash_post', null, $post );
+	if ( null !== $check ) {
+		return $check;
+	}
 	/**
 	 * 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_status = get_post_meta( $post_id, '_wp_trash_meta_status', true );
-	$post['post_status'] = $post_status;
+	delete_post_meta( $post_id, '_wp_trash_meta_status' );
+	delete_post_meta( $post_id, '_wp_trash_meta_time' );
-	delete_post_meta($post_id, '_wp_trash_meta_status');
-	delete_post_meta($post_id, '_wp_trash_meta_time');
+	wp_update_post( array( 'ID' => $post_id, 'post_status' => $post_status ) );
-	wp_insert_post($post);
+	wp_untrash_post_comments( $post_id );
-	wp_untrash_post_comments($post_id);
 	/**
 	 * Fires after a post is restored from the trash.
 	 *
 	 * @since 2.9.0
 *
 * @since 2.9.0
 *
 * @global wpdb $wpdb WordPress database abstraction object.
 *
-* @param int|WP_Post $post Optional. Post ID or post object. Defaults to global $post.
+* @param int|WP_Post|null $post Optional. Post ID or post object. Defaults to global $post.
-* @return mixed False on failure.
+* @return mixed|void False on failure.
 */
 function wp_trash_post_comments( $post = null ) {
 	global $wpdb;
 	$post = get_post($post);
 /**
 * Restore comments for a post from the trash.
 *
 * @since 2.9.0
 *
-* @param int|WP_Post $post Optional. Post ID or post object. Defaults to global $post.
+* @global wpdb $wpdb WordPress database abstraction object.
-* @return null|bool Null on failure.
+*
+* @param int|WP_Post|null $post Optional. Post ID or post object. Defaults to global $post.
+* @return true|void
 */
 function wp_untrash_post_comments( $post = null ) {
 	global $wpdb;
 	$post = get_post($post);
 	foreach ( $statuses as $comment_id => $comment_status )
 		$group_by_status[$comment_status][] = $comment_id;
 	foreach ( $group_by_status as $status => $comments ) {
 		// Sanity check. This shouldn't happen.
-		if ( 'post-trashed' == $status )
+		if ( 'post-trashed' == $status ) {
 			$status = '0';
-		$comments_in = implode( "', '", $comments );
+		}
-		$wpdb->query( "UPDATE $wpdb->comments SET comment_approved = '$status' WHERE comment_ID IN ('" . $comments_in . "')" );
+		$comments_in = implode( ', ', array_map( 'intval', $comments ) );
+		$wpdb->query( $wpdb->prepare( "UPDATE $wpdb->comments SET comment_approved = %s WHERE comment_ID IN ($comments_in)", $status ) );
 	}
 	clean_comment_cache( array_keys($statuses) );
 	delete_post_meta($post_id, '_wp_trash_meta_comments_status');
 *
 * @see wp_get_object_terms()
 *
 * @param int   $post_id Optional. The Post ID. Does not default to the ID of the
 *                       global $post. Default 0.
-* @param array $args    Optional. Category arguments. Default empty.
+* @param array $args    Optional. Category query parameters. Default empty array.
-* @return array List of categories.
+*                       See WP_Term_Query::__construct() for supported arguments.
+* @return array|WP_Error List of categories. If the `$fields` argument passed via `$args` is 'all' or
+*                        'all_with_object_id', an array of WP_Term objects will be returned. If `$fields`
+*                        is 'ids', an array of category ids. If `$fields` is 'names', an array of category names.
+*                        WP_Error object if 'category' taxonomy doesn't exist.
 */
 function wp_get_post_categories( $post_id = 0, $args = array() ) {
 	$post_id = (int) $post_id;
 	$defaults = array('fields' => 'ids');
 /**
 * Retrieve the tags for a post.
 *
 * 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()}.
+* wp_get_object_terms().
 *
 * @since 2.3.0
 *
 * @param int   $post_id Optional. The Post ID. Does not default to the ID of the
-*                       global $post. Defualt 0.
+*                       global $post. Default 0.
-* @param array $args Optional. Overwrite the defaults
+* @param array $args    Optional. Tag query parameters. Default empty array.
-* @return array List of post tags.
+*                       See WP_Term_Query::__construct() for supported arguments.
+* @return array|WP_Error Array of WP_Term objects on success or empty array if no tags were found.
+*                        WP_Error object if 'post_tag' taxonomy doesn't exist.
 */
 function wp_get_post_tags( $post_id = 0, $args = array() ) {
 	return wp_get_post_terms( $post_id, 'post_tag', $args);
 }
 /**
-* Retrieve the terms for a post.
+* Retrieves the terms for a post.
-*
-* 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()}.
 *
 * @since 2.8.0
 *
-* @param int    $post_id  Optional. The Post ID. Does not default to the ID of the
+* @param int          $post_id  Optional. The Post ID. Does not default to the ID of the
-*                         global $post. Default 0.
+*                               global $post. Default 0.
-* @param string $taxonomy Optional. The taxonomy for which to retrieve terms. Default 'post_tag'.
+* @param string|array $taxonomy Optional. The taxonomy slug or array of slugs for which
-* @param array  $args     Optional. {@link wp_get_object_terms()} arguments. Default empty array.
+*                               to retrieve terms. Default 'post_tag'.
-* @return array List of post tags.
+* @param array        $args     {
+*     Optional. Term query parameters. See WP_Term_Query::__construct() for supported arguments.
+*
+*     @type string $fields Term fields to retrieve. Default 'all'.
+* }
+* @return array|WP_Error Array of WP_Term objects on success or empty array if no terms were found.
+*                        WP_Error object if `$taxonomy` doesn't exist.
 */
 function wp_get_post_terms( $post_id = 0, $taxonomy = 'post_tag', $args = array() ) {
 	$post_id = (int) $post_id;
 	$defaults = array('fields' => 'all');
 *
 * @since 1.0.0
 *
 * @see get_posts()
 *
-* @param array  $args       Optional. Arguments to retrieve posts. Default empty array.
+* @param array  $args   Optional. Arguments to retrieve posts. Default empty array.
-* @param string $output     Optional. Type of output. Accepts ARRAY_A or ''. Default ARRAY_A.
+* @param string $output Optional. The required return type. One of OBJECT or ARRAY_A, which correspond to
-* @return array|bool Associative array if $output equals ARRAY_A, array or false if no results.
+*                       a WP_Post object or an associative array, respectively. Default ARRAY_A.
+* @return array|false Array of recent posts, where the type of each element is determined by $output parameter.
+*                     Empty array on failure.
 */
 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.' ) );
+		_deprecated_argument( __FUNCTION__, '3.1.0', __( 'Passing an integer number of posts is deprecated. Pass an array of arguments instead.' ) );
 		$args = array( 'numberposts' => absint( $args ) );
 	}
 	// Set default arguments.
 	$defaults = array(
 	$results = get_posts( $r );
 	// Backward compatibility. Prior to 3.1 expected posts to be returned in array.
 	if ( ARRAY_A == $output ){
-		foreach( $results as $key => $result ) {
+		foreach ( $results as $key => $result ) {
 			$results[$key] = get_object_vars( $result );
 		}
 		return $results ? $results : array();
 	}
 * and 'post_date_gmt' keys. You can close the comments or open the comments by
 * setting the value for 'comment_status' key.
 *
 * @since 1.0.0
 * @since 4.2.0 Support was added for encoding emoji in the post title, content, and excerpt.
+* @since 4.4.0 A 'meta_input' array can now be passed to `$postarr` to add post meta data.
 *
 * @see sanitize_post()
 * @global wpdb $wpdb WordPress database abstraction object.
 *
 * @param array $postarr {
 *     @type string $comment_status        Whether the post can accept comments. Accepts 'open' or 'closed'.
 *                                         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 $post_name             The post name. Default is the sanitized post title
+*                                         when creating a new post.
 *     @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
 *                                         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.
+*     @type array  $post_category         Array of category names, slugs, or IDs.
+*                                         Defaults to value of the 'default_category' option.
+*     @type array  $tags_input            Array of tag names, slugs, or IDs. Default empty.
+*     @type array  $tax_input             Array of taxonomy terms keyed by their taxonomy name. Default empty.
+*     @type array  $meta_input            Array of post meta values keyed by their post meta key. Default empty.
 * }
-* @param bool  $wp_error Optional. Whether to allow return of WP_Error on failure. Default false.
+* @param bool  $wp_error Optional. Whether to return a 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;
 	$user_id = get_current_user_id();
-	$defaults = array('post_status' => 'draft', 'post_type' => 'post', 'post_author' => $user_id,
+	$defaults = array(
-		'ping_status' => get_option('default_ping_status'), 'post_parent' => 0,
+		'post_author' => $user_id,
-		'menu_order' => 0, 'to_ping' =>  '', 'pinged' => '', 'post_password' => '',
+		'post_content' => '',
-		'guid' => '', 'post_content_filtered' => '', 'post_excerpt' => '', 'import_id' => 0,
+		'post_content_filtered' => '',
-		'post_content' => '', 'post_title' => '', 'context' => '');
+		'post_title' => '',
+		'post_excerpt' => '',
+		'post_status' => 'draft',
+		'post_type' => 'post',
+		'comment_status' => '',
+		'ping_status' => '',
+		'post_password' => '',
+		'to_ping' =>  '',
+		'pinged' => '',
+		'post_parent' => 0,
+		'menu_order' => 0,
+		'guid' => '',
+		'import_id' => 0,
+		'context' => '',
+	);
 	$postarr = wp_parse_args($postarr, $defaults);
 	unset( $postarr[ 'filter' ] );
 	$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'];
+	} elseif ( $update ) {
+		// For an update, don't modify the post_name if it wasn't supplied as an argument.
+		$post_name = $post_before->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".
+	 * Filters 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
 	 *
 			return 0;
 		}
 	}
 	$post_status = empty( $postarr['post_status'] ) ? 'draft' : $postarr['post_status'];
-	if ( 'attachment' === $post_type && ! in_array( $post_status, array( 'inherit', 'private', 'trash' ) ) ) {
+	if ( 'attachment' === $post_type && ! in_array( $post_status, array( 'inherit', 'private', 'trash', 'auto-draft' ), true ) ) {
 		$post_status = 'inherit';
 	}
 	if ( ! empty( $postarr['post_category'] ) ) {
 		// Filter out empty terms.
 	/*
 	 * 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( $postarr['post_date'] ) || '0000-00-00 00:00:00' == $postarr['post_date'] ) {
-		$post_date = current_time( 'mysql' );
+		if ( empty( $postarr['post_date_gmt'] ) || '0000-00-00 00:00:00' == $postarr['post_date_gmt'] ) {
+			$post_date = current_time( 'mysql' );
+		} else {
+			$post_date = get_date_from_gmt( $postarr['post_date_gmt'] );
+		}
 	} else {
 		$post_date = $postarr['post_date'];
 	}
 	// Validate the date.
 	$jj = substr( $post_date, 8, 2 );
 	$aa = substr( $post_date, 0, 4 );
 	$valid_date = wp_checkdate( $mm, $jj, $aa, $post_date );
 	if ( ! $valid_date ) {
 		if ( $wp_error ) {
-			return new WP_Error( 'invalid_date', __( 'Whoops, the provided date is invalid.' ) );
+			return new WP_Error( 'invalid_date', __( 'Invalid date.' ) );
 		} else {
 			return 0;
 		}
 	}
 		if ( 'publish' == $post_status ) {
 			$now = gmdate('Y-m-d H:i:59');
 			if ( mysql2date('U', $post_date_gmt, false) > mysql2date('U', $now, false) ) {
 				$post_status = 'future';
 			}
-		} elseif( 'future' == $post_status ) {
+		} elseif ( 'future' == $post_status ) {
 			$now = gmdate('Y-m-d H:i:59');
 			if ( mysql2date('U', $post_date_gmt, false) <= mysql2date('U', $now, false) ) {
 				$post_status = 'publish';
 			}
 		}
 	}
+	// Comment status.
 	if ( empty( $postarr['comment_status'] ) ) {
 		if ( $update ) {
 			$comment_status = 'closed';
 		} else {
-			$comment_status = get_option('default_comment_status');
+			$comment_status = get_default_comment_status( $post_type );
 		}
 	} else {
 		$comment_status = $postarr['comment_status'];
 	}
 	// These variables are needed by compact() later.
 	$post_content_filtered = $postarr['post_content_filtered'];
-	$post_author = empty( $postarr['post_author'] ) ? $user_id : $postarr['post_author'];
+	$post_author = isset( $postarr['post_author'] ) ? $postarr['post_author'] : $user_id;
-	$ping_status = empty( $postarr['ping_status'] ) ? get_option( 'default_ping_status' ) : $postarr['ping_status'];
+	$ping_status = empty( $postarr['ping_status'] ) ? get_default_comment_status( $post_type, 'pingback' ) : $postarr['ping_status'];
 	$to_ping = isset( $postarr['to_ping'] ) ? sanitize_trackback_urls( $postarr['to_ping'] ) : '';
 	$pinged = isset( $postarr['pinged'] ) ? $postarr['pinged'] : '';
 	$import_id = isset( $postarr['import_id'] ) ? $postarr['import_id'] : 0;
 	/*
 	} else {
 		$post_parent = 0;
 	}
 	/**
-	 * Filter the post parent -- used to check for and prevent hierarchy loops.
+	 * Filters 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 the post is being untrashed and it has a desired slug stored in post meta,
+	 * reassign it.
+	 */
+	if ( 'trash' === $previous_status && 'trash' !== $post_status ) {
+		$desired_post_slug = get_post_meta( $post_ID, '_wp_desired_post_slug', true );
+		if ( $desired_post_slug ) {
+			delete_post_meta( $post_ID, '_wp_desired_post_slug' );
+			$post_name = $desired_post_slug;
+		}
+	}
+	// If a trashed post has the desired slug, change it and let this post have it.
+	if ( 'trash' !== $post_status && $post_name ) {
+		wp_add_trashed_suffix_to_post_name_for_trashed_posts( $post_name, $post_ID );
+	}
+	// When trashing an existing post, change its slug to allow non-trashed posts to use it.
+	if ( 'trash' === $post_status && 'trash' !== $previous_status && 'new' !== $previous_status ) {
+		$post_name = wp_add_trashed_suffix_to_post_name_for_post( $post_ID );
+	}
 	$post_name = wp_unique_post_slug( $post_name, $post_ID, $post_status, $post_type, $post_parent );
 	// Don't unslash.
 	$post_mime_type = isset( $postarr['post_mime_type'] ) ? $postarr['post_mime_type'] : '';
 	// Expected_slashed (everything!).
 	$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' );
 	$emoji_fields = array( 'post_title', 'post_content', 'post_excerpt' );
-	foreach( $emoji_fields as $emoji_field ) {
+	foreach ( $emoji_fields as $emoji_field ) {
 		if ( isset( $data[ $emoji_field ] ) ) {
 			$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.
+		 * Filters 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.
+		 * Filters 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.
 		// 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' ) ) ) {
-		$data['post_name'] = sanitize_title( $data['post_title'], $post_ID );
+		$data['post_name'] = wp_unique_post_slug( sanitize_title( $data['post_title'], $post_ID ), $post_ID, $data['post_status'], $post_type, $post_parent );
 		$wpdb->update( $wpdb->posts, array( 'post_name' => $data['post_name'] ), $where );
+		clean_post_cache( $post_ID );
 	}
 	if ( is_object_in_taxonomy( $post_type, 'category' ) ) {
 		wp_set_post_categories( $post_ID, $post_category );
 	}
 	// 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 ( ! $taxonomy_obj ) {
+				/* translators: %s: taxonomy name */
+				_doing_it_wrong( __FUNCTION__, sprintf( __( 'Invalid taxonomy: %s.' ), $taxonomy ), '4.4.0' );
+				continue;
+			}
 			// array = hierarchical, string = non-hierarchical.
 			if ( is_array( $tags ) ) {
 				$tags = array_filter($tags);
 			}
 			if ( current_user_can( $taxonomy_obj->cap->assign_terms ) ) {
 				wp_set_post_terms( $post_ID, $tags, $taxonomy );
 			}
 		}
 	}
+	if ( ! empty( $postarr['meta_input'] ) ) {
+		foreach ( $postarr['meta_input'] as $field => $value ) {
+			update_post_meta( $post_ID, $field, $value );
+		}
+	}
 	$current_guid = get_post_field( 'guid', $post_ID );
 	// Set GUID.
 	if ( ! $update && '' == $current_guid ) {
 		$wpdb->update( $wpdb->posts, array( 'guid' => get_permalink( $post_ID ) ), $where );
 		if ( ! empty( $postarr['context'] ) ) {
 			add_post_meta( $post_ID, '_wp_attachment_context', $postarr['context'], true );
 		}
 	}
+	// Set or remove featured image.
+	if ( isset( $postarr['_thumbnail_id'] ) ) {
+		$thumbnail_support = current_theme_supports( 'post-thumbnails', $post_type ) && post_type_supports( $post_type, 'thumbnail' ) || 'revision' === $post_type;
+		if ( ! $thumbnail_support && 'attachment' === $post_type && $post_mime_type ) {
+			if ( wp_attachment_is( 'audio', $post_ID ) ) {
+				$thumbnail_support = post_type_supports( 'attachment:audio', 'thumbnail' ) || current_theme_supports( 'post-thumbnails', 'attachment:audio' );
+			} elseif ( wp_attachment_is( 'video', $post_ID ) ) {
+				$thumbnail_support = post_type_supports( 'attachment:video', 'thumbnail' ) || current_theme_supports( 'post-thumbnails', 'attachment:video' );
+			}
+		}
+		if ( $thumbnail_support ) {
+			$thumbnail_id = intval( $postarr['_thumbnail_id'] );
+			if ( -1 === $thumbnail_id ) {
+				delete_post_thumbnail( $post_ID );
+			} else {
+				set_post_thumbnail( $post_ID, $thumbnail_id );
+			}
+		}
+	}
 	clean_post_cache( $post_ID );
 	$post = get_post( $post_ID );
-	if ( ! empty( $postarr['page_template'] ) && 'page' == $data['post_type'] ) {
+	if ( ! empty( $postarr['page_template'] ) ) {
 		$post->page_template = $postarr['page_template'];
 		$page_templates = wp_get_theme()->get_page_templates( $post );
 		if ( 'default' != $postarr['page_template'] && ! isset( $page_templates[ $postarr['page_template'] ] ) ) {
 			if ( $wp_error ) {
-				return new WP_Error('invalid_page_template', __('The page template is invalid.'));
+				return new WP_Error( 'invalid_page_template', __( 'Invalid page template.' ) );
 			}
 			update_post_meta( $post_ID, '_wp_page_template', 'default' );
 		} else {
 			update_post_meta( $post_ID, '_wp_page_template', $postarr['page_template'] );
 		}
 			 * @since 2.0.0
 			 *
 			 * @param int $post_ID Attachment ID.
 			 */
 			do_action( 'edit_attachment', $post_ID );
+			$post_after = get_post( $post_ID );
+			/**
+			 * Fires once an existing attachment has been updated.
+			 *
+			 * @since 4.4.0
+			 *
+			 * @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( 'attachment_updated', $post_ID, $post_after, $post_before );
 		} else {
 			/**
 			 * Fires once an attachment has been added.
 			 *
 * from publishing drafts, etc.
 *
 * @since 2.5.0
 *
 * @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.
 */
 function check_and_publish_future_post( $post_id ) {
 	$post = get_post($post_id);
 	if ( empty($post) )
 		return;
 		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( $post_id ) );
 		return;
 	}
-	return wp_publish_post($post_id);
+	// wp_publish_post() returns no meaningful value.
+	wp_publish_post( $post_id );
 }
 /**
 * Computes a unique slug for the post, when given the desired slug and some post details.
 *
 * @since 2.8.0
 *
-* @global wpdb $wpdb WordPress database abstraction object.
+* @global wpdb       $wpdb WordPress database abstraction object.
 * @global WP_Rewrite $wp_rewrite
 *
 * @param string $slug        The desired slug (post_name).
 * @param int    $post_ID     Post ID.
 * @param string $post_status No uniqueness checks are made if the post is still draft or pending.
 * @param string $post_type   Post type.
 * @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 ) )
+	if ( in_array( $post_status, array( 'draft', 'pending', 'auto-draft' ) ) || ( 'inherit' == $post_status && 'revision' == $post_type ) || 'user_request' === $post_type )
 		return $slug;
 	global $wpdb, $wp_rewrite;
 	$original_slug = $slug;
 		// 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.
+		 * Filters 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 ) ) {
+		if ( $post_name_check || in_array( $slug, $feeds ) || 'embed' === $slug || 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++;
 		 */
 		$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.
+		 * Filters 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 ) ) {
+		if ( $post_name_check || in_array( $slug, $feeds ) || 'embed' === $slug || preg_match( "@^($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_type, $post_ID, $post_parent ) );
 				$suffix++;
 	} 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 ) );
+		// Prevent new post slugs that could result in URLs that conflict with date archives.
+		$post = get_post( $post_ID );
+		$conflicts_with_date_archive = false;
+		if ( 'post' === $post_type && ( ! $post || $post->post_name !== $slug ) && preg_match( '/^[0-9]+$/', $slug ) && $slug_num = intval( $slug ) ) {
+			$permastructs   = array_values( array_filter( explode( '/', get_option( 'permalink_structure' ) ) ) );
+			$postname_index = array_search( '%postname%', $permastructs );
+			/*
+			 * Potential date clashes are as follows:
+			 *
+			 * - Any integer in the first permastruct position could be a year.
+			 * - An integer between 1 and 12 that follows 'year' conflicts with 'monthnum'.
+			 * - An integer between 1 and 31 that follows 'monthnum' conflicts with 'day'.
+			 */
+			if ( 0 === $postname_index ||
+				( $postname_index && '%year%' === $permastructs[ $postname_index - 1 ] && 13 > $slug_num ) ||
+				( $postname_index && '%monthnum%' === $permastructs[ $postname_index - 1 ] && 32 > $slug_num )
+			) {
+				$conflicts_with_date_archive = true;
+			}
+		}
 		/**
-		 * Filter whether the post slug would be bad as a flat slug.
+		 * Filters 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 ) ) {
+		if ( $post_name_check || in_array( $slug, $feeds ) || 'embed' === $slug || $conflicts_with_date_archive || 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 ) );
 				$suffix++;
 			$slug = $alt_post_name;
 		}
 	}
 	/**
-	 * Filter the unique post slug.
+	 * Filters the unique post slug.
 	 *
 	 * @since 3.3.0
 	 *
 	 * @param string $slug          The post slug.
 	 * @param int    $post_ID       Post ID.
 *
 * @see wp_set_post_tags()
 *
 * @since 2.3.0
 *
-* @param int    $post_id Optional. The Post ID. Does not default to the ID of the global $post.
+* @param int          $post_id Optional. The Post ID. Does not default to the ID of the global $post.
-*                        Default 0.
+* @param string|array $tags    Optional. An array of tags to set for the post, or a string of tags
-* @param string $tags    Optional. The tags to set for the post, separated by commas. Default empty.
+*                              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.
+* @return array|false|WP_Error Array of affected term IDs. WP_Error or false on failure.
 */
 function wp_add_post_tags( $post_id = 0, $tags = '' ) {
 	return wp_set_post_tags($post_id, $tags, true);
 }
 *
 * @since 2.3.0
 *
 * @see wp_set_object_terms()
 *
-* @param int    $post_id Optional. The Post ID. Does not default to the ID of the global $post.
+* @param int          $post_id Optional. The Post ID. Does not default to the ID of the global $post.
-* @param string $tags    Optional. The tags to set for the post, separated by commas.
+* @param string|array $tags    Optional. An array of tags to set for the post, or a string of tags
-*                        Default empty.
+*                              separated by commas. Default empty.
-* @param bool   $append  Optional. If true, don't delete existing tags, just add on. If false,
+* @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.
+*                              replace the tags with the new tags. Default false.
-* @return mixed Array of affected term IDs. WP_Error or false on failure.
+* @return array|false|WP_Error Array of term taxonomy IDs of affected terms. 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);
 }
 *
 * @since 2.8.0
 *
 * @see wp_set_object_terms()
 *
-* @param int    $post_id  Optional. The Post ID. Does not default to the ID of the global $post.
+* @param int          $post_id  Optional. The Post ID. Does not default to the ID of the global $post.
-* @param string $tags     Optional. The tags to set for the post, separated by commas. Default empty.
+* @param string|array $tags     Optional. An array of terms to set for the post, or a string of terms
-* @param string $taxonomy Optional. Taxonomy name. Default 'post_tag'.
+*                               separated by commas. Default empty.
-* @param bool   $append   Optional. If true, don't delete existing tags, just add on. If false,
+* @param string       $taxonomy Optional. Taxonomy name. Default 'post_tag'.
-*                         replace the tags with the new tags. Default false.
+* @param bool         $append   Optional. If true, don't delete existing terms, just add on. If false,
-* @return mixed Array of affected term IDs. WP_Error or false on failure.
+*                               replace the terms with the new terms. Default false.
+* @return array|false|WP_Error Array of term taxonomy IDs of affected terms. WP_Error or false on failure.
 */
 function wp_set_post_terms( $post_id = 0, $tags = '', $taxonomy = 'post_tag', $append = false ) {
 	$post_id = (int) $post_id;
 	if ( !$post_id )
 *                                   of the global $post. Default 0.
 * @param array|int $post_categories Optional. List of categories or ID of category.
 *                                   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
+* @return array|false|WP_Error Array of term taxonomy IDs of affected categories. WP_Error or false on failure.
 */
 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_status = get_post_status( $post_ID );
 	return wp_set_post_terms( $post_ID, $post_categories, 'category', $append );
 }
 /**
-* Transition the post status of a post.
+* Fires actions related to the transitioning of a post's status.
 *
 * When a post is saved, the post status is "transitioned" from one status to another,
 * though this does not always mean the status has actually changed before and after
-* the save.
+* the save. This function fires a number of action hooks related to that transition:
+* the generic {@see 'transition_post_status'} action, as well as the dynamic hooks
+* {@see '$old_status_to_$new_status'} and {@see '$new_status_$post->post_type'}. Note
+* that the function does not transition the post object in the database.
 *
 * For instance: When publishing a post for the first time, the post status may transition
 * from 'draft' – or some other status – to 'publish'. However, if a post is already
 * published and is simply being updated, the "old" and "new" statuses may both be 'publish'
 * before and after the transition.
 	 */
 	do_action( "{$new_status}_{$post->post_type}", $post->ID, $post );
 }
 //
-// Trackback and ping functions
+// Comment, trackback, and pingback functions.
 //
 /**
 * Add a URL to those already pinged.
 *
 * @since 1.5.0
+* @since 4.7.0 $post_id can be a WP_Post object.
+* @since 4.7.0 $uri can be an array of URIs.
 *
 * @global wpdb $wpdb WordPress database abstraction object.
 *
-* @param int    $post_id Post ID.
+* @param int|WP_Post  $post_id Post object or ID.
-* @param string $uri     Ping URI.
+* @param string|array $uri     Ping URI or array of URIs.
-* @return int How many rows were updated.
+* @return int|false How many rows were updated.
 */
 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);
+	$post = get_post( $post_id );
-	$pung = preg_split('/\s/', $pung);
+	if ( ! $post ) {
-	$pung[] = $uri;
+		return false;
+	}
+	$pung = trim( $post->pinged );
+	$pung = preg_split( '/\s/', $pung );
+	if ( is_array( $uri ) ) {
+		$pung = array_merge( $pung, $uri );
+	}
+	else {
+		$pung[] = $uri;
+	}
 	$new = implode("\n", $pung);
 	/**
-	 * Filter the new ping URL to add for the given post.
+	 * Filters 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).
+	$return = $wpdb->update( $wpdb->posts, array( 'pinged' => $new ), array( 'ID' => $post->ID ) );
-	$new = wp_unslash($new);
+	clean_post_cache( $post->ID );
-	return $wpdb->update( $wpdb->posts, array( 'pinged' => $new ), array( 'ID' => $post_id ) );
+	return $return;
 }
 /**
 * Retrieve enclosures already enclosed for a post.
 *
 		return $pung;
 	foreach ( $custom_fields as $key => $val ) {
 		if ( 'enclosure' != $key || !is_array( $val ) )
 			continue;
-		foreach( $val as $enc ) {
+		foreach ( $val as $enc ) {
 			$enclosure = explode( "\n", $enc );
 			$pung[] = trim( $enclosure[ 0 ] );
 		}
 	}
 	/**
-	 * Filter the list of enclosures already enclosed for the given post.
+	 * Filters 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 apply_filters( 'get_enclosed', $pung, $post_id );
-	return $pung;
 }
 /**
 * Retrieve URLs already pinged for a post.
 *
 * @since 1.5.0
 *
-* @global wpdb $wpdb WordPress database abstraction object.
+* @since 4.7.0 $post_id can be a WP_Post object.
 *
-* @param int $post_id Post ID.
+* @param int|WP_Post $post_id Post ID or object.
 * @return array
 */
 function get_pung( $post_id ) {
-	global $wpdb;
+	$post = get_post( $post_id );
-	$pung = $wpdb->get_var( $wpdb->prepare( "SELECT pinged FROM $wpdb->posts WHERE ID = %d", $post_id ));
+	if ( ! $post ) {
-	$pung = trim($pung);
+		return false;
-	$pung = preg_split('/\s/', $pung);
+	}
+	$pung = trim( $post->pinged );
+	$pung = preg_split( '/\s/', $pung );
 	/**
-	 * Filter the list of already-pinged URLs for the given post.
+	 * Filters 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 apply_filters( 'get_pung', $pung );
-	return $pung;
 }
 /**
 * Retrieve URLs that need to be pinged.
 *
 * @since 1.5.0
-*
+* @since 4.7.0 $post_id can be a WP_Post object.
-* @global wpdb $wpdb WordPress database abstraction object.
+*
-*
+* @param int|WP_Post $post_id Post Object or ID
-* @param int $post_id Post ID
 * @return array
 */
 function get_to_ping( $post_id ) {
-	global $wpdb;
+	$post = get_post( $post_id );
-	$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 );
+	if ( ! $post ) {
+		return false;
+	}
+	$to_ping = sanitize_trackback_urls( $post->to_ping );
 	$to_ping = preg_split('/\s/', $to_ping, -1, PREG_SPLIT_NO_EMPTY);
 	/**
-	 * Filter the list of URLs yet to ping for the given post.
+	 * Filters 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 apply_filters( 'get_to_ping', $to_ping );
-	return $to_ping;
 }
 /**
 * Do trackbacks for a list of URLs.
 *
 		if ( strlen( $excerpt ) > 255 ) {
 			$excerpt = substr( $excerpt, 0, 252 ) . '&hellip;';
 		}
 		$trackback_urls = explode( ',', $tb_list );
-		foreach( (array) $trackback_urls as $tb_url ) {
+		foreach ( (array) $trackback_urls as $tb_url ) {
 			$tb_url = trim( $tb_url );
 			trackback( $tb_url, wp_unslash( $postdata['post_title'] ), $excerpt, $post_id );
 		}
 	}
 }
 *
 * @since 1.5.1
 * @deprecated 3.5.0 Use get_post()
 *
 * @param mixed  $page   Page object or page ID. Passed by reference.
-* @param string $output Optional. What to output. Accepts OBJECT, ARRAY_A, or ARRAY_N.
+* @param string $output Optional. The required return type. One of OBJECT, ARRAY_A, or ARRAY_N, which correspond to
-*                       Default OBJECT.
+*                       a WP_Post object, an associative array, or a numeric array, respectively. Default OBJECT.
 * @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.
+* @return WP_Post|array|null WP_Post (or array) on success, or null on failure.
 */
 function get_page( $page, $output = OBJECT, $filter = 'raw') {
 	return get_post( $page, $output, $filter );
 }
 * @since 2.1.0
 *
 * @global wpdb $wpdb WordPress database abstraction object.
 *
 * @param string       $page_path Page path.
-* @param string       $output    Optional. Output type. Accepts OBJECT, ARRAY_N, or ARRAY_A.
+* @param string       $output    Optional. The required return type. One of OBJECT, ARRAY_A, or ARRAY_N, which correspond to
-*                                Default OBJECT.
+*                                a WP_Post object, an associative array, or a numeric array, respectively. 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.
+* @return WP_Post|array|null WP_Post (or array) on success, or null on failure.
 */
 function get_page_by_path( $page_path, $output = OBJECT, $post_type = 'page' ) {
 	global $wpdb;
+	$last_changed = wp_cache_get_last_changed( 'posts' );
+	$hash = md5( $page_path . serialize( $post_type ) );
+	$cache_key = "get_page_by_path:$hash:$last_changed";
+	$cached = wp_cache_get( $cache_key, 'posts' );
+	if ( false !== $cached ) {
+		// Special case: '0' is a bad `$page_path`.
+		if ( '0' === $cached || 0 === $cached ) {
+			return;
+		} else {
+			return get_post( $cached, $output );
+		}
+	}
 	$page_path = rawurlencode(urldecode($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 );
+	$escaped_parts = esc_sql( $parts );
-	$in_string = "'" . implode( "','", $parts ) . "'";
+	$in_string = "'" . implode( "','", $escaped_parts ) . "'";
 	if ( is_array( $post_type ) ) {
 		$post_types = $post_type;
 	} else {
 		$post_types = array( $post_type, 'attachment' );
 	$foundid = 0;
 	foreach ( (array) $pages as $page ) {
 		if ( $page->post_name == $revparts[0] ) {
 			$count = 0;
 			$p = $page;
+			/*
+			 * Loop through the given path parts from right to left,
+			 * ensuring each matches the post ancestry.
+			 */
 			while ( $p->post_parent != 0 && isset( $pages[ $p->post_parent ] ) ) {
 				$count++;
 				$parent = $pages[ $p->post_parent ];
 				if ( ! isset( $revparts[ $count ] ) || $parent->post_name != $revparts[ $count ] )
 					break;
 					break;
 			}
 		}
 	}
-	if ( $foundid )
+	// We cache misses as well as hits.
+	wp_cache_set( $cache_key, $foundid, 'posts' );
+	if ( $foundid ) {
 		return get_post( $foundid, $output );
+	}
-	return null;
 }
 /**
 * Retrieve a page given its title.
 *
 * @since 2.1.0
 *
 * @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.
+* @param string       $output     Optional. The required return type. One of OBJECT, ARRAY_A, or ARRAY_N, which correspond to
-*                                 Default OBJECT.
+*                                 a WP_Post object, an associative array, or a numeric array, respectively. 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
+* @return WP_Post|array|null WP_Post (or array) on success, or null on failure.
 */
 function get_page_by_title( $page_title, $output = OBJECT, $post_type = 'page' ) {
 	global $wpdb;
 	if ( is_array( $post_type ) ) {
 		", $page_title, $post_type );
 	}
 	$page = $wpdb->get_var( $sql );
-	if ( $page )
+	if ( $page ) {
 		return get_post( $page, $output );
+	}
-	return null;
+}
-}
+/**
-/**
+* Identify descendants of a given page ID in a list of page objects.
-* Retrieve child pages from list of pages matching page ID.
+*
-*
+* Descendants are identified from the `$pages` array passed to the function. No database queries are performed.
-* Matches against the pages parameter against the page ID. Also matches all
-* 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 page objects from which descendants should be identified.
 * @return array List of page children.
 */
 function get_page_children( $page_id, $pages ) {
+	// Build a hash of ID -> children.
+	$children = array();
+	foreach ( (array) $pages as $page ) {
+		$children[ intval( $page->post_parent ) ][] = $page;
+	}
 	$page_list = array();
-	foreach ( (array) $pages as $page ) {
-		if ( $page->post_parent == $page_id ) {
+	// Start the search by looking at immediate children.
-			$page_list[] = $page;
+	if ( isset( $children[ $page_id ] ) ) {
-			if ( $children = get_page_children( $page->ID, $pages ) ) {
+		// Always start at the end of the stack in order to preserve original `$pages` order.
-				$page_list = array_merge( $page_list, $children );
+		$to_look = array_reverse( $children[ $page_id ] );
+		while ( $to_look ) {
+			$p = array_pop( $to_look );
+			$page_list[] = $p;
+			if ( isset( $children[ $p->ID ] ) ) {
+				foreach ( array_reverse( $children[ $p->ID ] ) as $child ) {
+					// Append to the `$to_look` stack to descend the tree.
+					$to_look[] = $child;
+				}
 			}
 		}
 	}
 	return $page_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, passed by reference.
+* @param array $pages   Posts array (passed by reference).
 * @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 array();
-		return $result;
 	}
 	$children = array();
 	foreach ( (array) $pages as $p ) {
 		$parent_id = intval( $p->post_parent );
 * @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 $children  Parent-children relations (passed by reference).
-* @param array &$result   Result, 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 $child ) {
+		foreach ( (array)$children[ $page_id ] as $child ) {
 			$result[ $child->ID ] = $child->post_name;
 			_page_traverse_name( $child->ID, $children, $result );
 		}
 	}
 }
 /**
-* Build URI for a page.
+* Build the URI path for a page.
 *
 * Sub pages will be in the "directory" under the parent page post name.
 *
 * @since 1.5.0
-*
+* @since 4.6.0 Converted the `$page` parameter to optional.
-* @param WP_Post|object|int $page Page object or page ID.
+*
+* @param WP_Post|object|int $page Optional. Page ID or WP_Post object. Default is global $post.
 * @return string|false Page URI, false on error.
 */
-function get_page_uri( $page ) {
+function get_page_uri( $page = 0 ) {
-	$page = get_post( $page );
+	if ( ! $page instanceof WP_Post ) {
+		$page = get_post( $page );
+	}
 	if ( ! $page )
 		return false;
 	$uri = $page->post_name;
 	foreach ( $page->ancestors as $parent ) {
-		$uri = get_post( $parent )->post_name . '/' . $uri;
+		$parent = get_post( $parent );
-	}
+		if ( $parent && $parent->post_name ) {
+			$uri = $parent->post_name . '/' . $uri;
-	return $uri;
+		}
-}
+	}
-/**
+	/**
-* Retrieve a list of pages.
+	 * Filters the URI for a page.
+	 *
+	 * @since 4.4.0
+	 *
+	 * @param string  $uri  Page URI.
+	 * @param WP_Post $page Page object.
+	 */
+	return apply_filters( 'get_page_uri', $uri, $page );
+}
+/**
+* Retrieve a list of pages (or hierarchical post type items).
 *
 * @global wpdb $wpdb WordPress database abstraction object.
 *
 * @since 1.5.0
 *
 * @param array|string $args {
 *     Optional. Array or string of arguments to retrieve pages.
 *
-*     @type int          $child_of     Page ID to return child and grandchild pages of.
+*     @type int          $child_of     Page ID to return child and grandchild pages of. Note: The value
-*                                      Default 0, or no restriction.
+*                                      of `$hierarchical` has no bearing on whether `$child_of` returns
+*                                      hierarchical results. Default 0, or no restriction.
 *     @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. Accepts 'post_author',
 *                                      'post_date', 'post_title', 'post_name', 'post_modified', 'menu_order',
 *                                      'post_modified_gmt', 'post_parent', 'ID', 'rand', 'comment_count'.
 *                                      'post_' can be omitted for any values that start with it.
 *                                      Default 'post_title'.
-*     @type bool         $hierarchical Whether to return pages hierarchically. Default true.
+*     @type bool         $hierarchical Whether to return pages hierarchically. If false in conjunction with
+*                                      `$child_of` also being false, both arguments will be disregarded.
+*                                      Default true.
 *     @type array        $exclude      Array of page IDs to exclude. Default empty array.
 *     @type array        $include      Array of page IDs to include. Cannot be used with `$child_of`,
 *                                      `$parent`, `$exclude`, `$meta_key`, `$meta_value`, or `$hierarchical`.
 *                                      Default empty array.
 *     @type string       $meta_key     Only include pages with this meta key. Default empty.
 *     @type string       $meta_value   Only include pages with this meta value. Requires `$meta_key`.
 *                                      Default empty.
 *     @type string       $authors      A comma-separated list of author IDs. Default empty.
-*     @type int          $parent       Page ID to return direct children of. `$hierarchical` must be false.
+*     @type int          $parent       Page ID to return direct children of. Default -1, or no restriction.
-*                                      Default -1, or no restriction.
 *     @type string|array $exclude_tree Comma-separated string or array of page IDs to exclude.
 *                                      Default empty array.
 *     @type int          $number       The number of pages to return. Default 0, or all pages.
 *     @type int          $offset       The number of pages to skip before returning. Requires `$number`.
 *                                      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.
+*     @type string|array $post_status  A comma-separated list or array of post statuses to include.
 *                                      Default 'publish'.
 * }
-* @return array List of pages matching defaults or `$args`.
+* @return array|false List of pages matching defaults or `$args`.
 */
 function get_pages( $args = array() ) {
 	global $wpdb;
 	$defaults = array(
-		'child_of' => 0, 'sort_order' => 'ASC',
+		'child_of'     => 0,
-		'sort_column' => 'post_title', 'hierarchical' => 1,
+		'sort_order'   => 'ASC',
-		'exclude' => array(), 'include' => array(),
+		'sort_column'  => 'post_title',
-		'meta_key' => '', 'meta_value' => '',
+		'hierarchical' => 1,
-		'authors' => '', 'parent' => -1, 'exclude_tree' => array(),
+		'exclude'      => array(),
-		'number' => '', 'offset' => 0,
+		'include'      => array(),
-		'post_type' => 'page', 'post_status' => 'publish',
+		'meta_key'     => '',
+		'meta_value'   => '',
+		'authors'      => '',
+		'parent'       => -1,
+		'exclude_tree' => array(),
+		'number'       => '',
+		'offset'       => 0,
+		'post_type'    => 'page',
+		'post_status'  => 'publish',
 	);
 	$r = wp_parse_args( $args, $defaults );
 	$number = (int) $r['number'];
 		return false;
 	}
 	// $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' );
+	$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.
 		$pages = array_map( 'get_post', $cache );
 		$pages = get_page_children($child_of, $pages);
 	}
 	if ( ! empty( $r['exclude_tree'] ) ) {
 		$exclude = wp_parse_id_list( $r['exclude_tree'] );
-		foreach( $exclude as $id ) {
+		foreach ( $exclude as $id ) {
 			$children = get_page_children( $id, $pages );
 			foreach ( $children as $child ) {
 				$exclude[] = $child->ID;
 			}
 		}
 	// Convert to WP_Post instances
 	$pages = array_map( 'get_post', $pages );
 	/**
-	 * Filter the retrieved list of pages.
+	 * Filters 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 apply_filters( 'get_pages', $pages, $r );
-	return $pages;
 }
 //
 // Attachment functions
 //
 * By default, the comments will use the default settings for whether the
 * comments are allowed. You can close them manually or keep them open by
 * setting the value for the 'comment_status' key.
 *
 * @since 2.0.0
+* @since 4.7.0 Added the `$wp_error` parameter to allow a WP_Error to be returned on failure.
 *
 * @see wp_insert_post()
 *
-* @param string|array $args   Arguments for inserting an attachment.
+* @param string|array $args     Arguments for inserting an attachment.
-* @param string       $file   Optional. Filename.
+* @param string       $file     Optional. Filename.
-* @param int          $parent Optional. Parent post ID.
+* @param int          $parent   Optional. Parent post ID.
-* @return int Attachment ID.
+* @param bool         $wp_error Optional. Whether to return a WP_Error on failure. Default false.
-*/
+* @return int|WP_Error The attachment ID on success. The value 0 or WP_Error on failure.
-function wp_insert_attachment( $args, $file = false, $parent = 0 ) {
+*/
+function wp_insert_attachment( $args, $file = false, $parent = 0, $wp_error = false ) {
 	$defaults = array(
 		'file'        => $file,
 		'post_parent' => 0
 	);
 		$data['post_parent'] = $parent;
 	}
 	$data['post_type'] = 'attachment';
-	return wp_insert_post( $data );
+	return wp_insert_post( $data, $wp_error );
 }
 /**
 * Trash or delete an attachment.
 *
 * @global wpdb $wpdb WordPress database abstraction object.
 *
 * @param int  $post_id      Attachment ID.
 * @param bool $force_delete Optional. Whether to bypass trash and force deletion.
 *                           Default false.
-* @return mixed False on failure. Post data on success.
+* @return WP_Post|false|null Post data on success, false or null on failure.
 */
 function wp_delete_attachment( $post_id, $force_delete = false ) {
 	global $wpdb;
-	if ( !$post = $wpdb->get_row( $wpdb->prepare("SELECT * FROM $wpdb->posts WHERE ID = %d", $post_id) ) )
+	$post = $wpdb->get_row( $wpdb->prepare( "SELECT * FROM $wpdb->posts WHERE ID = %d", $post_id ) );
+	if ( ! $post ) {
 		return $post;
+	}
-	if ( 'attachment' != $post->post_type )
+	$post = get_post( $post );
+	if ( 'attachment' !== $post->post_type ) {
 		return false;
+	}
-	if ( !$force_delete && EMPTY_TRASH_DAYS && MEDIA_TRASH && 'trash' != $post->post_status )
+	if ( ! $force_delete && EMPTY_TRASH_DAYS && MEDIA_TRASH && 'trash' !== $post->post_status ) {
 		return wp_trash_post( $post_id );
+	}
 	delete_post_meta($post_id, '_wp_trash_meta_status');
 	delete_post_meta($post_id, '_wp_trash_meta_time');
 	$meta = wp_get_attachment_metadata( $post_id );
 	wp_delete_object_term_relationships($post_id, get_object_taxonomies($post->post_type));
 	// Delete all for any posts.
 	delete_metadata( 'post', null, '_thumbnail_id', $post_id, true );
+	wp_defer_comment_counting( 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 )
+	foreach ( $comment_ids as $comment_id ) {
 		wp_delete_comment( $comment_id, true );
+	}
+	wp_defer_comment_counting( false );
 	$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 );
 		return false;
 	}
 	/** This action is documented in wp-includes/post.php */
 	do_action( 'deleted_post', $post_id );
-	$uploadpath = wp_upload_dir();
+	wp_delete_attachment_files( $post_id, $meta, $backup_sizes, $file );
-	if ( ! empty($meta['thumb']) ) {
+	clean_post_cache( $post );
+	return $post;
+}
+/**
+* Deletes all files that belong to the given attachment.
+*
+* @since 4.9.7
+*
+* @param int    $post_id      Attachment ID.
+* @param array  $meta         The attachment's meta data.
+* @param array  $backup_sizes The meta data for the attachment's backup images.
+* @param string $file         Absolute path to the attachment's file.
+* @return bool True on success, false on failure.
+*/
+function wp_delete_attachment_files( $post_id, $meta, $backup_sizes, $file ) {
+	global $wpdb;
+	$uploadpath = wp_get_upload_dir();
+	$deleted    = true;
+	if ( ! empty( $meta['thumb'] ) ) {
 		// 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", '%' . $wpdb->esc_like( $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);
+			$thumbfile = str_replace( basename( $file ), $meta['thumb'], $file );
-			/** This filter is documented in wp-includes/functions.php */
+			if ( ! empty( $thumbfile ) ) {
-			$thumbfile = apply_filters( 'wp_delete_file', $thumbfile );
+				$thumbfile = path_join( $uploadpath['basedir'], $thumbfile );
-			@ unlink( path_join($uploadpath['basedir'], $thumbfile) );
+				$thumbdir  = path_join( $uploadpath['basedir'], dirname( $file ) );
+				if ( ! wp_delete_file_from_directory( $thumbfile, $thumbdir ) ) {
+					$deleted = false;
+				}
+			}
 		}
 	}
 	// Remove intermediate and backup images if there are any.
 	if ( isset( $meta['sizes'] ) && is_array( $meta['sizes'] ) ) {
+		$intermediate_dir = path_join( $uploadpath['basedir'], dirname( $file ) );
 		foreach ( $meta['sizes'] as $size => $sizeinfo ) {
 			$intermediate_file = str_replace( basename( $file ), $sizeinfo['file'], $file );
-			/** This filter is documented in wp-includes/functions.php */
+			if ( ! empty( $intermediate_file ) ) {
-			$intermediate_file = apply_filters( 'wp_delete_file', $intermediate_file );
+				$intermediate_file = path_join( $uploadpath['basedir'], $intermediate_file );
-			@ unlink( path_join( $uploadpath['basedir'], $intermediate_file ) );
-		}
+				if ( ! wp_delete_file_from_directory( $intermediate_file, $intermediate_dir ) ) {
-	}
+					$deleted = false;
+				}
-	if ( is_array($backup_sizes) ) {
+			}
+		}
+	}
+	if ( is_array( $backup_sizes ) ) {
+		$del_dir = path_join( $uploadpath['basedir'], dirname( $meta['file'] ) );
 		foreach ( $backup_sizes as $size ) {
-			$del_file = path_join( dirname($meta['file']), $size['file'] );
+			$del_file = path_join( dirname( $meta['file'] ), $size['file'] );
-			/** This filter is documented in wp-includes/functions.php */
+			if ( ! empty( $del_file ) ) {
-			$del_file = apply_filters( 'wp_delete_file', $del_file );
+				$del_file = path_join( $uploadpath['basedir'], $del_file );
-			@ unlink( path_join($uploadpath['basedir'], $del_file) );
-		}
+				if ( ! wp_delete_file_from_directory( $del_file, $del_dir ) ) {
-	}
+					$deleted = false;
+				}
-	wp_delete_file( $file );
+			}
+		}
-	clean_post_cache( $post );
+	}
-	return $post;
+	if ( ! wp_delete_file_from_directory( $file, $uploadpath['basedir'] ) ) {
+		$deleted = false;
+	}
+	return $deleted;
 }
 /**
 * Retrieve attachment meta field for attachment ID.
 *
 * @since 2.1.0
 *
-* @param int  $post_id    Attachment ID. Default 0.
+* @param int  $attachment_id Attachment post ID. Defaults to global $post.
-* @param bool $unfiltered Optional. If true, filters are not run. Default false.
+* @param bool $unfiltered    Optional. If true, filters are not run. Default false.
-* @return string|bool Attachment meta field. False on failure.
+* @return mixed Attachment meta field. False on failure.
 */
-function wp_get_attachment_metadata( $post_id = 0, $unfiltered = false ) {
+function wp_get_attachment_metadata( $attachment_id = 0, $unfiltered = false ) {
-	$post_id = (int) $post_id;
+	$attachment_id = (int) $attachment_id;
-	if ( !$post = get_post( $post_id ) )
+	if ( ! $post = get_post( $attachment_id ) ) {
 		return false;
+	}
 	$data = get_post_meta( $post->ID, '_wp_attachment_metadata', true );
 	if ( $unfiltered )
 		return $data;
 	/**
-	 * Filter the attachment meta data.
+	 * Filters the attachment meta data.
 	 *
 	 * @since 2.1.0
 	 *
-	 * @param array|bool $data    Array of meta data for the given attachment, or false
+	 * @param array|bool $data          Array of meta data for the given attachment, or false
-	 *                            if the object does not exist.
+	 *                                  if the object does not exist.
-	 * @param int        $post_id Attachment ID.
+	 * @param int        $attachment_id Attachment post 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   $attachment_id Attachment post ID.
-* @param array $data    Attachment data.
+* @param array $data          Attachment meta data.
 * @return int|bool False if $post is invalid.
 */
-function wp_update_attachment_metadata( $post_id, $data ) {
+function wp_update_attachment_metadata( $attachment_id, $data ) {
-	$post_id = (int) $post_id;
+	$attachment_id = (int) $attachment_id;
-	if ( !$post = get_post( $post_id ) )
+	if ( ! $post = get_post( $attachment_id ) ) {
 		return false;
+	}
 	/**
-	 * Filter the updated attachment meta data.
+	 * Filters the updated attachment meta data.
 	 *
 	 * @since 2.1.0
 	 *
-	 * @param array $data    Array of updated attachment meta data.
+	 * @param array $data          Array of updated attachment meta data.
-	 * @param int   $post_id Attachment ID.
+	 * @param int   $attachment_id Attachment post 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 Optional. Attachment ID. Default 0.
+* @global string $pagenow
-* @return string|bool Attachment URL, otherwise false.
+*
-*/
+* @param int $attachment_id Optional. Attachment post ID. Defaults to global $post.
-function wp_get_attachment_url( $post_id = 0 ) {
+* @return string|false Attachment URL, otherwise false.
-	$post_id = (int) $post_id;
+*/
-	if ( !$post = get_post( $post_id ) )
+function wp_get_attachment_url( $attachment_id = 0 ) {
+	$attachment_id = (int) $attachment_id;
+	if ( ! $post = get_post( $attachment_id ) ) {
 		return false;
+	}
 	if ( 'attachment' != $post->post_type )
 		return false;
 	$url = '';
 	// Get attached file.
-	if ( $file = get_post_meta( $post->ID, '_wp_attached_file', true) ) {
+	if ( $file = get_post_meta( $post->ID, '_wp_attached_file', true ) ) {
 		// Get upload directory.
-		if ( ($uploads = wp_upload_dir()) && false === $uploads['error'] ) {
+		if ( ( $uploads = wp_get_upload_dir() ) && false === $uploads['error'] ) {
 			// 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 );
+				// Get the directory name relative to the basedir (back compat for pre-2.7 uploads)
+				$url = trailingslashit( $uploads['baseurl'] . '/' . _wp_get_attachment_relative_path( $file ) ) . basename( $file );
 			} else {
 				// It's a newly-uploaded file, therefore $file is relative to the basedir.
 				$url = $uploads['baseurl'] . "/$file";
 			}
 		}
 	 */
 	if ( empty($url) ) {
 		$url = get_the_guid( $post->ID );
 	}
-	// On SSL front-end, URLs should be HTTPS.
+	// 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.
+	 * Filters the attachment URL.
 	 *
 	 * @since 2.1.0
 	 *
-	 * @param string $url     URL for the given attachment.
+	 * @param string $url           URL for the given attachment.
+	 * @param int    $attachment_id Attachment post ID.
+	 */
+	$url = apply_filters( 'wp_get_attachment_url', $url, $post->ID );
+	if ( empty( $url ) )
+		return false;
+	return $url;
+}
+/**
+* Retrieves the caption for an attachment.
+*
+* @since 4.6.0
+*
+* @param int $post_id Optional. Attachment ID. Default is the ID of the global `$post`.
+* @return string|false False on failure. Attachment caption on success.
+*/
+function wp_get_attachment_caption( $post_id = 0 ) {
+	$post_id = (int) $post_id;
+	if ( ! $post = get_post( $post_id ) ) {
+		return false;
+	}
+	if ( 'attachment' !== $post->post_type ) {
+		return false;
+	}
+	$caption = $post->post_excerpt;
+	/**
+	 * Filters the attachment caption.
+	 *
+	 * @since 4.6.0
+	 *
+	 * @param string $caption Caption for the given attachment.
 	 * @param int    $post_id Attachment ID.
 	 */
-	$url = apply_filters( 'wp_get_attachment_url', $url, $post->ID );
+	return apply_filters( 'wp_get_attachment_caption', $caption, $post->ID );
-	if ( empty( $url ) )
-		return false;
-	return $url;
 }
 /**
 * Retrieve thumbnail for an attachment.
 *
 * @since 2.1.0
 *
 * @param int $post_id Optional. Attachment ID. Default 0.
-* @return mixed False on failure. Thumbnail file path on success.
+* @return string|false 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 ) )
 		return false;
 	$file = get_attached_file( $post->ID );
 	if ( !empty($imagedata['thumb']) && ($thumbfile = str_replace(basename($file), $imagedata['thumb'], $file)) && file_exists($thumbfile) ) {
 		/**
-		 * Filter the attachment thumbnail file path.
+		 * Filters the attachment thumbnail file path.
 		 *
 		 * @since 2.1.0
 		 *
 		 * @param string $thumbfile File path to the attachment thumbnail.
 		 * @param int    $post_id   Attachment ID.
 * Retrieve URL for an attachment thumbnail.
 *
 * @since 2.1.0
 *
 * @param int $post_id Optional. Attachment ID. Default 0.
-* @return string|bool False on failure. Thumbnail URL on success.
+* @return string|false 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 ) )
 		return false;
 		return false;
 	$url = str_replace(basename($url), basename($thumb), $url);
 	/**
-	 * Filter the attachment thumbnail URL.
+	 * Filters the attachment thumbnail URL.
 	 *
 	 * @since 2.1.0
 	 *
 	 * @param string $url     URL for the attachment thumbnail.
 	 * @param int    $post_id Attachment ID.
 /**
 * Verifies an attachment is of a given type.
 *
 * @since 4.2.0
 *
-* @param string      $type    Attachment type. Accepts 'image', 'audio', or 'video'.
+* @param string      $type Attachment type. Accepts 'image', 'audio', or 'video'.
-* @param int|WP_Post $post_id Optional. Attachment ID. Default 0.
+* @param int|WP_Post $post Optional. Attachment ID or object. Default is global $post.
 * @return bool True if one of the accepted types, false otherwise.
 */
-function wp_attachment_is( $type, $post_id = 0 ) {
+function wp_attachment_is( $type, $post = null ) {
-	if ( ! $post = get_post( $post_id ) ) {
+	if ( ! $post = get_post( $post ) ) {
 		return false;
 	}
 	if ( ! $file = get_attached_file( $post->ID ) ) {
 		return false;
 /**
 * Checks if the attachment is an image.
 *
 * @since 2.1.0
-* @since 4.2.0 Modified into wrapper for wp_attachment_is()
+* @since 4.2.0 Modified into wrapper for wp_attachment_is() and
-*
+*              allowed WP_Post object to be passed.
-* @param int|WP_Post $post Optional. Attachment ID. Default 0.
+*
+* @param int|WP_Post $post Optional. Attachment ID or object. Default is global $post.
 * @return bool Whether the attachment is an image.
 */
-function wp_attachment_is_image( $post = 0 ) {
+function wp_attachment_is_image( $post = null ) {
 	return wp_attachment_is( 'image', $post );
 }
 /**
 * Retrieve the icon for a MIME type.
 *
 * @since 2.1.0
 *
 * @param string|int $mime MIME type or attachment ID.
-* @return string|bool Icon, false otherwise.
+* @return string|false Icon, false otherwise.
 */
 function wp_mime_type_icon( $mime = 0 ) {
 	if ( !is_numeric($mime) )
 		$icon = wp_cache_get("mime_type_icon_$mime");
 		$post_mimes = array();
 		if ( is_numeric($mime) ) {
 			$mime = (int) $mime;
 			if ( $post = get_post( $mime ) ) {
 				$post_id = (int) $post->ID;
-				$ext = preg_replace('/^.+?\.([^.]+)$/', '$1', $post->guid);
+				$file = get_attached_file( $post_id );
+				$ext = preg_replace('/^.+?\.([^.]+)$/', '$1', $file);
 				if ( !empty($ext) ) {
 					$post_mimes[] = $ext;
 					if ( $ext_type = wp_ext2type( $ext ) )
 						$post_mimes[] = $ext_type;
 				}
 		$icon_files = wp_cache_get('icon_files');
 		if ( !is_array($icon_files) ) {
 			/**
-			 * Filter the icon directory path.
+			 * Filters the icon directory path.
 			 *
 			 * @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.
+			 * Filters 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.
+			 * Filters the list of icon directory URIs.
 			 *
 			 * @since 2.5.0
 			 *
 			 * @param array $uris List of icon directory URIs.
 			 */
 		$matches = wp_match_mime_types(array_keys($types), $post_mimes);
 		$matches['default'] = array('default');
 		foreach ( $matches as $match => $wilds ) {
-			if ( isset($types[$wilds[0]])) {
+			foreach ( $wilds as $wild ) {
-				$icon = $types[$wilds[0]];
+				if ( ! isset( $types[ $wild ] ) ) {
-				if ( !is_numeric($mime) )
+					continue;
-					wp_cache_add("mime_type_icon_$mime", $icon);
+				}
-				break;
+				$icon = $types[ $wild ];
+				if ( ! is_numeric( $mime ) ) {
+					wp_cache_add( "mime_type_icon_$mime", $icon );
+				}
+				break 2;
 			}
 		}
 	}
 	/**
-	 * Filter the mime type icon.
+	 * Filters the mime type icon.
 	 *
 	 * @since 2.1.0
 	 *
 	 * @param string $icon    Path to the mime type icon.
 	 * @param string $mime    Mime type.
 * @since 2.1.0
 *
 * @param int     $post_id     Post ID.
 * @param WP_Post $post        The 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 ) {
-	// Don't bother if it hasnt changed.
+	// Don't bother if it hasn't changed.
-	if ( $post->post_name == $post_before->post_name )
+	if ( $post->post_name == $post_before->post_name ) {
 		return;
+	}
 	// We're only concerned with published, non-hierarchical objects.
-	if ( $post->post_status != 'publish' || is_post_type_hierarchical( $post->post_type ) )
+	if ( ! ( 'publish' === $post->post_status || ( 'attachment' === get_post_type( $post ) && 'inherit' === $post->post_status ) ) || is_post_type_hierarchical( $post->post_type ) ) {
 		return;
+	}
-	$old_slugs = (array) get_post_meta($post_id, '_wp_old_slug');
+	$old_slugs = (array) get_post_meta( $post_id, '_wp_old_slug' );
 	// 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) )
+	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);
+		add_post_meta( $post_id, '_wp_old_slug', $post_before->post_name );
+	}
 	// If the new slug was used previously, delete it from the list.
-	if ( in_array($post->post_name, $old_slugs) )
+	if ( in_array( $post->post_name, $old_slugs ) ) {
-		delete_post_meta($post_id, '_wp_old_slug', $post->post_name);
+		delete_post_meta( $post_id, '_wp_old_slug', $post->post_name );
+	}
+}
+/**
+* Check for changed dates for published post objects and save the old date.
+*
+* The function is used when a post object of any type is updated,
+* by comparing the current and previous post objects.
+*
+* If the date was changed and not already part of the old dates then it will be
+* added to the post meta field ('_wp_old_date') for storing old dates for that
+* post.
+*
+* 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 4.9.3
+*
+* @param int     $post_id     Post ID.
+* @param WP_Post $post        The Post Object
+* @param WP_Post $post_before The Previous Post Object
+*/
+function wp_check_for_changed_dates( $post_id, $post, $post_before ) {
+	$previous_date = date( 'Y-m-d', strtotime( $post_before->post_date ) );
+	$new_date = date( 'Y-m-d', strtotime( $post->post_date ) );
+	// Don't bother if it hasn't changed.
+	if ( $new_date == $previous_date ) {
+		return;
+	}
+	// We're only concerned with published, non-hierarchical objects.
+	if ( ! ( 'publish' === $post->post_status || ( 'attachment' === get_post_type( $post ) && 'inherit' === $post->post_status ) ) || is_post_type_hierarchical( $post->post_type ) ) {
+		return;
+	}
+	$old_dates = (array) get_post_meta( $post_id, '_wp_old_date' );
+	// If we haven't added this old date before, add it now.
+	if ( ! empty( $previous_date ) && ! in_array( $previous_date, $old_dates ) ) {
+		add_post_meta( $post_id, '_wp_old_date', $previous_date );
+	}
+	// If the new slug was used previously, delete it from the list.
+	if ( in_array( $new_date, $old_dates ) ) {
+		delete_post_meta( $post_id, '_wp_old_date', $new_date );
+	}
 }
 /**
 * Retrieve the private post SQL based on capability.
 *
 * post_status of a post type. The function will return a piece of SQL code
 * that can be added to a WHERE clause; this SQL is constructed to allow all
 * published posts, and all private posts to which the user has access.
 *
 * @since 2.2.0
-*
+* @since 4.3.0 Added the ability to pass an array to `$post_type`.
-* @param string $post_type Post type. Currently only supports 'post' or 'page'.
+*
+* @param string|array $post_type Single post type or an array of post types. 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( $post_type, false );
 }
 /**
 * Retrieve the post SQL based on capability, author, and type.
 *
 * @since 3.0.0
+* @since 4.3.0 Introduced the ability to pass an array of post types to `$post_type`.
 *
 * @see get_private_posts_cap_sql()
-*
+* @global wpdb $wpdb WordPress database abstraction object.
-* @param string $post_type   Post type.
+*
-* @param bool   $full        Optional. Returns a full WHERE statement instead of just
+* @param array|string   $post_type   Single post type or an array of post types.
-*                            an 'andalso' term. Default true.
+* @param bool           $full        Optional. Returns a full WHERE statement instead of just
-* @param int    $post_author Optional. Query posts having a single author ID. Default null.
+*                                    an 'andalso' term. Default true.
-* @param bool   $public_only Optional. Only return public posts. Skips cap checks for
+* @param int            $post_author Optional. Query posts having a single author ID. Default null.
-*                            $current_user.  Default false.
+* @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.
+	if ( is_array( $post_type ) ) {
-	$post_type_obj = get_post_type_object( $post_type );
+		$post_types = $post_type;
-	if ( ! $post_type_obj )
+	} else {
-		return $full ? 'WHERE 1 = 0' : ' 1 = 0 ';
+		$post_types = array( $post_type );
+	}
-	/**
-	 * Filter the capability to read private posts for a custom post type
+	$post_type_clauses = array();
-	 * when generating SQL for getting posts by author.
+	foreach ( $post_types as $post_type ) {
-	 *
+		$post_type_obj = get_post_type_object( $post_type );
-	 * @since 2.2.0
+		if ( ! $post_type_obj ) {
-	 * @deprecated 3.2.0 The hook transitioned from "somewhat useless" to "totally useless".
+			continue;
-	 *
+		}
-	 * @param string $cap Capability.
-	 */
+		/**
-	if ( ! $cap = apply_filters( 'pub_priv_sql_capability', '' ) ) {
+		 * Filters the capability to read private posts for a custom post type
-		$cap = $post_type_obj->cap->read_private_posts;
+		 * when generating SQL for getting posts by author.
-	}
+		 *
+		 * @since 2.2.0
-	$sql = $wpdb->prepare( 'post_type = %s', $post_type );
+		 * @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 = current_user_can( $post_type_obj->cap->read_private_posts );
+		}
+		// Only need to check the cap if $public_only is false.
+		$post_status_sql = "post_status = 'publish'";
+		if ( false === $public_only ) {
+			if ( $cap ) {
+				// Does the user have the capability to view private posts? Guess so.
+				$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 ) {
+					$post_status_sql .= " OR post_status = 'private' AND post_author = $id";
+				} elseif ( $id == (int) $post_author ) {
+					$post_status_sql .= " OR post_status = 'private'";
+				} // else none
+			} // else none
+		}
+		$post_type_clauses[] = "( post_type = '" . $post_type . "' AND ( $post_status_sql ) )";
+	}
+	if ( empty( $post_type_clauses ) ) {
+		return $full ? 'WHERE 1 = 0' : '1 = 0';
+	}
+	$sql = '( '. implode( ' OR ', $post_type_clauses ) . ' )';
 	if ( null !== $post_author ) {
 		$sql .= $wpdb->prepare( ' AND post_author = %d', $post_author );
 	}
-	// Only need to check the cap if $public_only is false.
-	$post_status_sql = "post_status = 'publish'";
-	if ( false === $public_only ) {
-		if ( current_user_can( $cap ) ) {
-			// Does the user have the capability to view private posts? Guess so.
-			$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 ) {
-				$post_status_sql .= " OR post_status = 'private' AND post_author = $id";
-			} elseif ( $id == (int) $post_author ) {
-				$post_status_sql .= " OR post_status = 'private'";
-			} // else none
-		} // else none
-	}
-	$sql .= " AND ($post_status_sql)";
 	if ( $full ) {
 		$sql = 'WHERE ' . $sql;
 	}
 * The server timezone is the default and is the difference between GMT and
 * server time. The 'blog' value is the date when the last post was posted. The
 * 'gmt' is when the last post was posted in GMT formatted date.
 *
 * @since 0.71
-*
+* @since 4.4.0 The `$post_type` argument was added.
-* @param string $timezone The location to get the time. Accepts 'gmt', 'blog',
+*
-*                         or 'server'. Default 'server'.
+* @param string $timezone  Optional. The timezone for the timestamp. Accepts 'server', 'blog', or 'gmt'.
+*                          'server' uses the server's internal timezone.
+*                          'blog' uses the `post_modified` field, which proxies to the timezone set for the site.
+*                          'gmt' uses the `post_modified_gmt` field.
+*                          Default 'server'.
+* @param string $post_type Optional. The post type to check. Default 'any'.
 * @return string The date of the last post.
 */
-function get_lastpostdate( $timezone = 'server' ) {
+function get_lastpostdate( $timezone = 'server', $post_type = 'any' ) {
 	/**
-	 * Filter the date the last post was published.
+	 * Filters the date the last post was published.
 	 *
 	 * @since 2.3.0
 	 *
-	 * @param string $date     Date the last post was published. Likely values are 'gmt',
+	 * @param string $date     Date the last post was published.
-	 *                         'blog', or 'server'.
 	 * @param string $timezone Location to use for getting the post published date.
+	 *                         See get_lastpostdate() for accepted `$timezone` values.
 	 */
-	return apply_filters( 'get_lastpostdate', _get_last_post_time( $timezone, 'date' ), $timezone );
+	return apply_filters( 'get_lastpostdate', _get_last_post_time( $timezone, 'date', $post_type ), $timezone );
 }
 /**
 * Get the timestamp of the last time any post was modified.
 *
 * The server timezone is the default and is the difference between GMT and
 * server time. The 'blog' value is just when the last post was modified. The
 * 'gmt' is when the last post was modified in GMT time.
 *
 * @since 1.2.0
-*
+* @since 4.4.0 The `$post_type` argument was added.
-* @param string $timezone Optional. The timezone for the timestamp. Uses the server's internal timezone.
+*
-*                         Accepts 'server', 'blog', 'gmt'. or 'server'. 'server' uses the server's
+* @param string $timezone  Optional. The timezone for the timestamp. See get_lastpostdate()
-*                         internal timezone. 'blog' uses the `post_modified` field, which proxies
+*                          for information on accepted values.
-*                         to the timezone set for the site. 'gmt' uses the `post_modified_gmt` field.
+*                          Default 'server'.
-*                         Default 'server'.
+* @param string $post_type Optional. The post type to check. Default 'any'.
 * @return string The timestamp.
 */
-function get_lastpostmodified( $timezone = 'server' ) {
+function get_lastpostmodified( $timezone = 'server', $post_type = 'any' ) {
-	$lastpostmodified = _get_last_post_time( $timezone, 'modified' );
+	/**
+	 * Pre-filter the return value of get_lastpostmodified() before the query is run.
+	 *
+	 * @since 4.4.0
+	 *
+	 * @param string $lastpostmodified Date the last post was modified.
+	 *                                 Returning anything other than false will short-circuit the function.
+	 * @param string $timezone         Location to use for getting the post modified date.
+	 *                                 See get_lastpostdate() for accepted `$timezone` values.
+	 * @param string $post_type        The post type to check.
+	 */
+	$lastpostmodified = apply_filters( 'pre_get_lastpostmodified', false, $timezone, $post_type );
+	if ( false !== $lastpostmodified ) {
+		return $lastpostmodified;
+	}
+	$lastpostmodified = _get_last_post_time( $timezone, 'modified', $post_type );
 	$lastpostdate = get_lastpostdate($timezone);
-	if ( $lastpostdate > $lastpostmodified )
+	if ( $lastpostdate > $lastpostmodified ) {
 		$lastpostmodified = $lastpostdate;
+	}
 	/**
-	 * Filter the date the last post was modified.
+	 * Filters 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.
+	 *                                 See get_lastpostdate() for accepted `$timezone` values.
 	 */
 	return apply_filters( 'get_lastpostmodified', $lastpostmodified, $timezone );
 }
 /**
 * Get the timestamp of the last time any post was modified or published.
 *
 * @since 3.1.0
+* @since 4.4.0 The `$post_type` argument was added.
 * @access private
 *
-* @param string $timezone The timezone for the timestamp. See {@see get_lastpostmodified()}
+* @global wpdb $wpdb WordPress database abstraction object.
-*                         for information on accepted values.
+*
-* @param string $field    Post field to check. Accepts 'date' or 'modified'.
+* @param string $timezone  The timezone for the timestamp. See get_lastpostdate().
-* @return string The timestamp.
+*                          for information on accepted values.
-*/
+* @param string $field     Post field to check. Accepts 'date' or 'modified'.
-function _get_last_post_time( $timezone, $field ) {
+* @param string $post_type Optional. The post type to check. Default 'any'.
+* @return string|false The timestamp.
+*/
+function _get_last_post_time( $timezone, $field, $post_type = 'any' ) {
 	global $wpdb;
-	if ( !in_array( $field, array( 'date', 'modified' ) ) )
+	if ( ! in_array( $field, array( 'date', 'modified' ) ) ) {
 		return false;
+	}
 	$timezone = strtolower( $timezone );
 	$key = "lastpost{$field}:$timezone";
+	if ( 'any' !== $post_type ) {
+		$key .= ':' . sanitize_key( $post_type );
+	}
 	$date = wp_cache_get( $key, 'timeinfo' );
+	if ( false !== $date ) {
-	if ( !$date ) {
+		return $date;
-		$add_seconds_server = date('Z');
+	}
+	if ( 'any' === $post_type ) {
 		$post_types = get_post_types( array( 'public' => true ) );
-		array_walk( $post_types, array( &$wpdb, 'escape_by_ref' ) );
+		array_walk( $post_types, array( $wpdb, 'escape_by_ref' ) );
 		$post_types = "'" . implode( "', '", $post_types ) . "'";
+	} else {
-		switch ( $timezone ) {
+		$post_types = "'" . sanitize_key( $post_type ) . "'";
-			case 'gmt':
+	}
-				$date = $wpdb->get_var("SELECT post_{$field}_gmt FROM $wpdb->posts WHERE post_status = 'publish' AND post_type IN ({$post_types}) ORDER BY post_{$field}_gmt DESC LIMIT 1");
-				break;
+	switch ( $timezone ) {
-			case 'blog':
+		case 'gmt':
-				$date = $wpdb->get_var("SELECT post_{$field} FROM $wpdb->posts WHERE post_status = 'publish' AND post_type IN ({$post_types}) ORDER BY post_{$field}_gmt DESC LIMIT 1");
+			$date = $wpdb->get_var("SELECT post_{$field}_gmt FROM $wpdb->posts WHERE post_status = 'publish' AND post_type IN ({$post_types}) ORDER BY post_{$field}_gmt DESC LIMIT 1");
-				break;
+			break;
-			case 'server':
+		case 'blog':
-				$date = $wpdb->get_var("SELECT DATE_ADD(post_{$field}_gmt, INTERVAL '$add_seconds_server' SECOND) FROM $wpdb->posts WHERE post_status = 'publish' AND post_type IN ({$post_types}) ORDER BY post_{$field}_gmt DESC LIMIT 1");
+			$date = $wpdb->get_var("SELECT post_{$field} FROM $wpdb->posts WHERE post_status = 'publish' AND post_type IN ({$post_types}) ORDER BY post_{$field}_gmt DESC LIMIT 1");
-				break;
+			break;
-		}
+		case 'server':
+			$add_seconds_server = date( 'Z' );
-		if ( $date )
+			$date = $wpdb->get_var("SELECT DATE_ADD(post_{$field}_gmt, INTERVAL '$add_seconds_server' SECOND) FROM $wpdb->posts WHERE post_status = 'publish' AND post_type IN ({$post_types}) ORDER BY post_{$field}_gmt DESC LIMIT 1");
-			wp_cache_set( $key, $date, 'timeinfo' );
+			break;
 	}
-	return $date;
+	if ( $date ) {
+		wp_cache_set( $key, $date, 'timeinfo' );
+		return $date;
+	}
+	return false;
 }
 /**
 * Updates posts in cache.
 *
 * @since 1.5.1
 *
-* @param array $posts Array of post objects, passed by reference.
+* @param array $posts Array of post objects (passed by reference).
 */
 function update_post_cache( &$posts ) {
 	if ( ! $posts )
 		return;
 * This function not run if $_wp_suspend_cache_invalidation is not empty. See
 * wp_suspend_cache_invalidation().
 *
 * @since 2.0.0
 *
-* @global wpdb $wpdb WordPress database abstraction object.
+* @global bool $_wp_suspend_cache_invalidation
 *
 * @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;
+	global $_wp_suspend_cache_invalidation;
 	if ( ! empty( $_wp_suspend_cache_invalidation ) )
 		return;
 	$post = get_post( $post );
 * function, do not need to perform SQL queries on their own.
 *
 * @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
+* @return array|false Returns false if there is nothing to update or an array
-*                    of metadata.
+*                     of metadata.
 */
 function update_postmeta_cache( $post_ids ) {
 	return update_meta_cache('post', $post_ids);
 }
 *
 * This function will not run if $_wp_suspend_cache_invalidation is not empty.
 *
 * @since 3.0.0
 *
-* @see wp_suspend_cache_invalidation()
+* @global bool $_wp_suspend_cache_invalidation
 *
 * @param int  $id          The attachment ID in the cache to clean.
 * @param bool $clean_terms Optional. Whether to clean terms cache. Default false.
 */
 function clean_attachment_cache( $id, $clean_terms = false ) {
 	// 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:$timezone", 'timeinfo' );
+			wp_cache_delete( "lastpostdate:$timezone:{$post->post_type}", 'timeinfo' );
 		}
 	}
 	if ( $new_status !== $old_status ) {
 		wp_cache_delete( _count_posts_cache_key( $post->post_type ), 'counts' );
 * @since 2.3.0
 * @access private
 *
 * @param int     $deprecated Not used. Can be set to null. Never implemented. Not marked
 *                            as deprecated with _deprecated_argument() as it conflicts with
-*                            wp_transition_post_status() and the default filter for
+*                            wp_transition_post_status() and the default filter for _future_post_hook().
-*                            {@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 ) );
 	if ( get_option('default_pingback_flag') )
 		add_post_meta( $post_id, '_pingme', '1' );
 	add_post_meta( $post_id, '_encloseme', '1' );
-	wp_schedule_single_event(time(), 'do_pings');
+	if ( ! wp_next_scheduled( 'do_pings' ) ) {
+		wp_schedule_single_event( time(), 'do_pings' );
+	}
 }
 /**
 * Return the post's parent's post_ID
 *
 * @since 3.1.0
 *
 * @param int $post_ID
 *
-* @return int|bool Post parent ID, otherwise false.
+* @return int|false 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;
 /**
 * Check the given subset of the post hierarchy for hierarchy loops.
 *
 * Prevents loops from forming and breaks those that it finds. Attached
-* to the 'wp_insert_post_parent' filter.
+* to the {@see 'wp_insert_post_parent'} filter.
 *
 * @since 3.1.0
 *
 * @see wp_find_hierarchy_loop()
 *
 *
 * @since 3.1.0
 *
 * @param int|WP_Post $post         Post ID or post object where thumbnail should be attached.
 * @param int         $thumbnail_id Thumbnail to attach.
-* @return bool True on success, false on failure.
+* @return int|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 ) ) {
 		wp_delete_post( $delete, true );
 	}
 }
 /**
+* Queues posts for lazy-loading of term meta.
+*
+* @since 4.5.0
+*
+* @param array $posts Array of WP_Post objects.
+*/
+function wp_queue_posts_for_term_meta_lazyload( $posts ) {
+	$post_type_taxonomies = $term_ids = array();
+	foreach ( $posts as $post ) {
+		if ( ! ( $post instanceof WP_Post ) ) {
+			continue;
+		}
+		if ( ! isset( $post_type_taxonomies[ $post->post_type ] ) ) {
+			$post_type_taxonomies[ $post->post_type ] = get_object_taxonomies( $post->post_type );
+		}
+		foreach ( $post_type_taxonomies[ $post->post_type ] as $taxonomy ) {
+			// Term cache should already be primed by `update_post_term_cache()`.
+			$terms = get_object_term_cache( $post->ID, $taxonomy );
+			if ( false !== $terms ) {
+				foreach ( $terms as $term ) {
+					if ( ! isset( $term_ids[ $term->term_id ] ) ) {
+						$term_ids[] = $term->term_id;
+					}
+				}
+			}
+		}
+	}
+	if ( $term_ids ) {
+		$lazyloader = wp_metadata_lazyloader();
+		$lazyloader->queue_objects( 'term', $term_ids );
+	}
+}
+/**
 * 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 3.4.0
 * @access private
 *
 * @see update_post_caches()
 *
-* @param array $ids               ID list
+* @global wpdb $wpdb WordPress database abstraction object.
+*
+* @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;
 		$fresh_posts = $wpdb->get_results( sprintf( "SELECT $wpdb->posts.* FROM $wpdb->posts WHERE ID IN (%s)", join( ",", $non_cached_ids ) ) );
 		update_post_caches( $fresh_posts, 'any', $update_term_cache, $update_meta_cache );
 	}
 }
+/**
+* Adds a suffix if any trashed posts have a given slug.
+*
+* Store its desired (i.e. current) slug so it can try to reclaim it
+* if the post is untrashed.
+*
+* For internal use.
+*
+* @since 4.5.0
+* @access private
+*
+* @param string $post_name Slug.
+* @param string $post_ID   Optional. Post ID that should be ignored. Default 0.
+*/
+function wp_add_trashed_suffix_to_post_name_for_trashed_posts( $post_name, $post_ID = 0 ) {
+	$trashed_posts_with_desired_slug = get_posts( array(
+		'name' => $post_name,
+		'post_status' => 'trash',
+		'post_type' => 'any',
+		'nopaging' => true,
+		'post__not_in' => array( $post_ID )
+	) );
+	if ( ! empty( $trashed_posts_with_desired_slug ) ) {
+		foreach ( $trashed_posts_with_desired_slug as $_post ) {
+			wp_add_trashed_suffix_to_post_name_for_post( $_post );
+		}
+	}
+}
+/**
+* Adds a trashed suffix for a given post.
+*
+* Store its desired (i.e. current) slug so it can try to reclaim it
+* if the post is untrashed.
+*
+* For internal use.
+*
+* @since 4.5.0
+* @access private
+*
+* @param WP_Post $post The post.
+* @return string New slug for the post.
+*/
+function wp_add_trashed_suffix_to_post_name_for_post( $post ) {
+	global $wpdb;
+	$post = get_post( $post );
+	if ( '__trashed' === substr( $post->post_name, -9 ) ) {
+		return $post->post_name;
+	}
+	add_post_meta( $post->ID, '_wp_desired_post_slug', $post->post_name );
+	$post_name = _truncate_post_slug( $post->post_name, 191 ) . '__trashed';
+	$wpdb->update( $wpdb->posts, array( 'post_name' => $post_name ), array( 'ID' => $post->ID ) );
+	clean_post_cache( $post->ID );
+	return $post_name;
+}
+/**
+* Filter the SQL clauses of an attachment query to include filenames.
+*
+* @since 4.7.0
+* @access private
+*
+* @global wpdb $wpdb WordPress database abstraction object.
+*
+* @param array $clauses An array including WHERE, GROUP BY, JOIN, ORDER BY,
+*                       DISTINCT, fields (SELECT), and LIMITS clauses.
+* @return array The modified clauses.
+*/
+function _filter_query_attachment_filenames( $clauses ) {
+	global $wpdb;
+	remove_filter( 'posts_clauses', __FUNCTION__ );
+	// Add a LEFT JOIN of the postmeta table so we don't trample existing JOINs.
+	$clauses['join'] .= " LEFT JOIN {$wpdb->postmeta} AS sq1 ON ( {$wpdb->posts}.ID = sq1.post_id AND sq1.meta_key = '_wp_attached_file' )";
+	$clauses['groupby'] = "{$wpdb->posts}.ID";
+	$clauses['where'] = preg_replace(
+		"/\({$wpdb->posts}.post_content (NOT LIKE|LIKE) (\'[^']+\')\)/",
+		"$0 OR ( sq1.meta_value $1 $2 )",
+		$clauses['where'] );
+	return $clauses;
+}

changeset 7	cf61fcea0001
parent 5	5e2f62d02dcd
child 9	177826044cd9