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

equal deleted inserted replaced

-:3d4e9c994f10
+:a86126ab1dd4
 * @package WordPress
 * @subpackage Post
 */
 //
-// Post Type Registration
+// Post Type registration.
 //
 /**
 * Creates the initial post types when 'init' action is fired.
 *
 			'_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,
+			'menu_icon'             => 'dashicons-admin-post',
 			'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' ),
 			'_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,
+			'menu_icon'             => 'dashicons-admin-page',
 			'hierarchical'          => true,
 			'rewrite'               => false,
 			'query_var'             => false,
 			'delete_with_user'      => true,
 			'supports'              => array( 'title', 'editor', 'author', 'thumbnail', 'page-attributes', 'custom-fields', 'comments', 'revisions' ),
 			'capability_type'       => 'post',
 			'capabilities'          => array(
 				'create_posts' => 'upload_files',
 			),
 			'map_meta_cap'          => true,
+			'menu_icon'             => 'dashicons-admin-media',
 			'hierarchical'          => false,
 			'rewrite'               => false,
 			'query_var'             => false,
 			'show_in_nav_menus'     => false,
 			'delete_with_user'      => true,
 		'publish',
 		array(
 			'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>' ),
+			/* translators: %s: Number of published posts. */
+			'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 status' ),
 			'protected'   => true,
 			'_builtin'    => true, /* internal use only. */
-			'label_count' => _n_noop( 'Scheduled <span class="count">(%s)</span>', 'Scheduled <span class="count">(%s)</span>' ),
+			/* translators: %s: Number of scheduled posts. */
+			'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 status' ),
+			'label'         => _x( 'Draft', 'post status' ),
-			'protected'   => true,
+			'protected'     => true,
-			'_builtin'    => true, /* internal use only. */
+			'_builtin'      => true, /* internal use only. */
-			'label_count' => _n_noop( 'Draft <span class="count">(%s)</span>', 'Drafts <span class="count">(%s)</span>' ),
+			/* translators: %s: Number of draft posts. */
+			'label_count'   => _n_noop(
+				'Draft <span class="count">(%s)</span>',
+				'Drafts <span class="count">(%s)</span>'
+			),
+			'date_floating' => true,
 		)
 	);
 	register_post_status(
 		'pending',
 		array(
-			'label'       => _x( 'Pending', 'post status' ),
+			'label'         => _x( 'Pending', 'post status' ),
-			'protected'   => true,
+			'protected'     => true,
-			'_builtin'    => true, /* internal use only. */
+			'_builtin'      => true, /* internal use only. */
-			'label_count' => _n_noop( 'Pending <span class="count">(%s)</span>', 'Pending <span class="count">(%s)</span>' ),
+			/* translators: %s: Number of pending posts. */
+			'label_count'   => _n_noop(
+				'Pending <span class="count">(%s)</span>',
+				'Pending <span class="count">(%s)</span>'
+			),
+			'date_floating' => true,
 		)
 	);
 	register_post_status(
 		'private',
 		array(
 			'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>' ),
+			/* translators: %s: Number of private posts. */
+			'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 status' ),
 			'internal'                  => true,
 			'_builtin'                  => true, /* internal use only. */
-			'label_count'               => _n_noop( 'Trash <span class="count">(%s)</span>', 'Trash <span class="count">(%s)</span>' ),
+			/* translators: %s: Number of trashed posts. */
+			'label_count'               => _n_noop(
+				'Trash <span class="count">(%s)</span>',
+				'Trash <span class="count">(%s)</span>'
+			),
 			'show_in_admin_status_list' => true,
 		)
 	);
 	register_post_status(
 		'auto-draft',
 		array(
-			'label'    => 'auto-draft',
+			'label'         => 'auto-draft',
-			'internal' => true,
+			'internal'      => true,
-			'_builtin' => true, /* internal use only. */
+			'_builtin'      => true, /* internal use only. */
+			'date_floating' => true,
 		)
 	);
 	register_post_status(
 		'inherit',
 		'request-pending',
 		array(
 			'label'               => _x( 'Pending', 'request status' ),
 			'internal'            => true,
 			'_builtin'            => true, /* internal use only. */
-			'label_count'         => _n_noop( 'Pending <span class="count">(%s)</span>', 'Pending <span class="count">(%s)</span>' ),
+			/* translators: %s: Number of pending requests. */
+			'label_count'         => _n_noop(
+				'Pending <span class="count">(%s)</span>',
+				'Pending <span class="count">(%s)</span>'
+			),
 			'exclude_from_search' => false,
 		)
 	);
 	register_post_status(
 		'request-confirmed',
 		array(
 			'label'               => _x( 'Confirmed', 'request status' ),
 			'internal'            => true,
 			'_builtin'            => true, /* internal use only. */
-			'label_count'         => _n_noop( 'Confirmed <span class="count">(%s)</span>', 'Confirmed <span class="count">(%s)</span>' ),
+			/* translators: %s: Number of confirmed requests. */
+			'label_count'         => _n_noop(
+				'Confirmed <span class="count">(%s)</span>',
+				'Confirmed <span class="count">(%s)</span>'
+			),
 			'exclude_from_search' => false,
 		)
 	);
 	register_post_status(
 		'request-failed',
 		array(
 			'label'               => _x( 'Failed', 'request status' ),
 			'internal'            => true,
 			'_builtin'            => true, /* internal use only. */
-			'label_count'         => _n_noop( 'Failed <span class="count">(%s)</span>', 'Failed <span class="count">(%s)</span>' ),
+			/* translators: %s: Number of failed requests. */
+			'label_count'         => _n_noop(
+				'Failed <span class="count">(%s)</span>',
+				'Failed <span class="count">(%s)</span>'
+			),
 			'exclude_from_search' => false,
 		)
 	);
 	register_post_status(
 		'request-completed',
 		array(
 			'label'               => _x( 'Completed', 'request status' ),
 			'internal'            => true,
 			'_builtin'            => true, /* internal use only. */
-			'label_count'         => _n_noop( 'Completed <span class="count">(%s)</span>', 'Completed <span class="count">(%s)</span>' ),
+			/* translators: %s: Number of completed requests. */
+			'label_count'         => _n_noop(
+				'Completed <span class="count">(%s)</span>',
+				'Completed <span class="count">(%s)</span>'
+			),
 			'exclude_from_search' => false,
 		)
 	);
 }
 */
 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_get_upload_dir() ) && false === $uploads['error'] ) ) {
+	if ( $file && 0 !== strpos( $file, '/' ) && ! preg_match( '|^.:\\\|', $file ) ) {
-		$file = $uploads['basedir'] . "/$file";
+		$uploads = wp_get_upload_dir();
+		if ( false === $uploads['error'] ) {
+			$file = $uploads['basedir'] . "/$file";
+		}
 	}
 	if ( $unfiltered ) {
 		return $file;
 	}
 	/**
 	 * Filters the attached file based on the given ID.
 	 *
 	 * @since 2.1.0
 	 *
-	 * @param string $file          Path to attached file.
+	 * @param string|false $file          The file path to where the attached file should be, false otherwise.
-	 * @param int    $attachment_id Attachment ID.
+	 * @param int          $attachment_id Attachment ID.
 	 */
 	return apply_filters( 'get_attached_file', $file, $attachment_id );
 }
 /**
 	 * @param string $file          Path to the attached file to update.
 	 * @param int    $attachment_id Attachment ID.
 	 */
 	$file = apply_filters( 'update_attached_file', $file, $attachment_id );
-	if ( $file = _wp_relative_upload_path( $file ) ) {
+	$file = _wp_relative_upload_path( $file );
+	if ( $file ) {
 		return update_post_meta( $attachment_id, '_wp_attached_file', $file );
 	} else {
 		return delete_post_meta( $attachment_id, '_wp_attached_file' );
 	}
 }
 * @since 2.0.0
 *
 * @see get_posts()
 * @todo Check validity of description.
 *
-* @global WP_Post $post
+* @global WP_Post $post Global post object.
 *
 * @param mixed  $args   Optional. User defined arguments for replacing the defaults. Default empty.
-* @param string $output Optional. The required return type. One of OBJECT, ARRAY_A, or ARRAY_N, which correspond to
+* @param string $output Optional. The required return type. One of OBJECT, ARRAY_A, or ARRAY_N, which
-*                       a WP_Post object, an associative array, or a numeric array, respectively. Default OBJECT.
+*                       correspond to a WP_Post object, an associative array, or a numeric array,
-* @return array Array of children, where the type of each element is determined by $output parameter.
+*                       respectively. Default OBJECT.
-*               Empty array on failure.
+* @return WP_Post[]|int[] Array of post objects or post IDs.
 */
 function get_children( $args = '', $output = OBJECT ) {
 	$kids = array();
 	if ( empty( $args ) ) {
 		if ( isset( $GLOBALS['post'] ) ) {
 		'post_type'   => 'any',
 		'post_status' => 'any',
 		'post_parent' => 0,
 	);
-	$r = wp_parse_args( $args, $defaults );
+	$parsed_args = wp_parse_args( $args, $defaults );
-	$children = get_posts( $r );
+	$children = get_posts( $parsed_args );
 	if ( ! $children ) {
 		return $kids;
 	}
-	if ( ! empty( $r['fields'] ) ) {
+	if ( ! empty( $parsed_args['fields'] ) ) {
 		return $children;
 	}
 	update_post_cache( $children );
 	foreach ( $children as $key => $child ) {
 		$kids[ $child->ID ] = $children[ $key ];
 	}
-	if ( $output == OBJECT ) {
+	if ( OBJECT == $output ) {
 		return $kids;
-	} elseif ( $output == ARRAY_A ) {
+	} elseif ( ARRAY_A == $output ) {
 		$weeuns = array();
 		foreach ( (array) $kids as $kid ) {
 			$weeuns[ $kid->ID ] = get_object_vars( $kids[ $kid->ID ] );
 		}
 		return $weeuns;
-	} elseif ( $output == ARRAY_N ) {
+	} elseif ( ARRAY_N == $output ) {
 		$babes = array();
 		foreach ( (array) $kids as $kid ) {
 			$babes[ $kid->ID ] = array_values( get_object_vars( $kids[ $kid->ID ] ) );
 		}
 		return $babes;
 * `<!--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 read more ('more_text').
+* @return string[] {
+*     Extended entry info.
+*
+*     @type string $main      Content before the more tag.
+*     @type string $extended  Content after the more tag.
+*     @type string $more_text Custom read more text, or empty string.
+* }
 */
 function get_extended( $post ) {
-	//Match the new style more links.
+	// Match the new style more links.
 	if ( preg_match( '/<!--more(.*?)?-->/', $post, $matches ) ) {
 		list($main, $extended) = explode( $matches[0], $post, 2 );
 		$more_text             = $matches[1];
 	} else {
 		$main      = $post;
 		$extended  = '';
 		$more_text = '';
 	}
-	//  leading and trailing whitespace.
+	// Leading and trailing whitespace.
 	$main      = preg_replace( '/^[\s]*(.*)[\s]*$/', '\\1', $main );
 	$extended  = preg_replace( '/^[\s]*(.*)[\s]*$/', '\\1', $extended );
 	$more_text = preg_replace( '/^[\s]*(.*)[\s]*$/', '\\1', $more_text );
 	return array(
 * See sanitize_post() for optional $filter values. Also, the parameter
 * `$post`, must be given as a variable, since it is passed by reference.
 *
 * @since 1.5.1
 *
-* @global WP_Post $post
+* @global WP_Post $post Global post object.
 *
 * @param int|WP_Post|null $post   Optional. Post ID or post object. Defaults to global $post.
-* @param string           $output Optional. The required return type. One of OBJECT, ARRAY_A, or ARRAY_N, which correspond to
+* @param string           $output Optional. The required return type. One of OBJECT, ARRAY_A, or ARRAY_N, which
-*                                 a WP_Post object, an associative array, or a numeric array, respectively. Default OBJECT.
+*                                 correspond to 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.
 */
 		$_post = $post;
 	} elseif ( is_object( $post ) ) {
 		if ( empty( $post->filter ) ) {
 			$_post = sanitize_post( $post, 'raw' );
 			$_post = new WP_Post( $_post );
-		} elseif ( 'raw' == $post->filter ) {
+		} elseif ( 'raw' === $post->filter ) {
 			$_post = new WP_Post( $post );
 		} else {
 			$_post = WP_Post::get_instance( $post->ID );
 		}
 	} else {
 		return null;
 	}
 	$_post = $_post->filter( $filter );
-	if ( $output == ARRAY_A ) {
+	if ( ARRAY_A == $output ) {
 		return $_post->to_array();
-	} elseif ( $output == ARRAY_N ) {
+	} elseif ( ARRAY_N == $output ) {
 		return array_values( $_post->to_array() );
 	}
 	return $_post;
 }
 * Retrieve ancestors of a post.
 *
 * @since 2.5.0
 *
 * @param int|WP_Post $post Post ID or post object.
-* @return array Ancestor IDs or empty array if none are found.
+* @return int[] Ancestor IDs or empty array if none are found.
 */
 function get_post_ancestors( $post ) {
 	$post = get_post( $post );
 	if ( ! $post || empty( $post->post_parent ) || $post->post_parent == $post->ID ) {
 		return array();
 	}
 	$ancestors = array();
-	$id = $ancestors[] = $post->post_parent;
+	$id          = $post->post_parent;
+	$ancestors[] = $id;
 	while ( $ancestor = get_post( $id ) ) {
 		// Loop detection: If the ancestor has been seen before, break.
-		if ( empty( $ancestor->post_parent ) || ( $ancestor->post_parent == $post->ID ) || in_array( $ancestor->post_parent, $ancestors ) ) {
+		if ( empty( $ancestor->post_parent ) || ( $ancestor->post_parent == $post->ID ) || in_array( $ancestor->post_parent, $ancestors, true ) ) {
 			break;
 		}
-		$id = $ancestors[] = $ancestor->post_parent;
+		$id          = $ancestor->post_parent;
+		$ancestors[] = $id;
 	}
 	return $ancestors;
 }
 	if ( ! is_object( $post ) ) {
 		return false;
 	}
-	if ( 'attachment' == $post->post_type ) {
+	if ( 'attachment' === $post->post_type ) {
-		if ( 'private' == $post->post_status ) {
+		if ( 'private' === $post->post_status ) {
 			return 'private';
 		}
 		// Unattached attachments are assumed to be published.
-		if ( ( 'inherit' == $post->post_status ) && ( 0 == $post->post_parent ) ) {
+		if ( ( 'inherit' === $post->post_status ) && ( 0 == $post->post_parent ) ) {
 			return 'publish';
 		}
 		// Inherit status from the parent.
 		if ( $post->post_parent && ( $post->ID != $post->post_parent ) ) {
 			$parent_post_status = get_post_status( $post->post_parent );
-			if ( 'trash' == $parent_post_status ) {
+			if ( 'trash' === $parent_post_status ) {
 				return get_post_meta( $post->post_parent, '_wp_trash_meta_status', true );
 			} else {
 				return $parent_post_status;
 			}
 		}
 * Posts have a limited set of valid status values, this provides the
 * post_status values and descriptions.
 *
 * @since 2.5.0
 *
-* @return array List of post statuses.
+* @return string[] Array of post status labels keyed by their status.
 */
 function get_post_statuses() {
 	$status = array(
 		'draft'   => __( 'Draft' ),
 		'pending' => __( 'Pending Review' ),
 * Pages have a limited set of valid status values, this provides the
 * post_status values and descriptions.
 *
 * @since 2.5.0
 *
-* @return array List of page statuses.
+* @return string[] Array of page status labels keyed by their status.
 */
 function get_page_statuses() {
 	$status = array(
 		'draft'   => __( 'Draft' ),
 		'private' => __( 'Private' ),
 *
 * @return array
 */
 function _wp_privacy_statuses() {
 	return array(
-		'request-pending'   => __( 'Pending' ),      // Pending confirmation from user.
+		'request-pending'   => _x( 'Pending', 'request status' ),      // Pending confirmation from user.
-		'request-confirmed' => __( 'Confirmed' ),    // User has confirmed the action.
+		'request-confirmed' => _x( 'Confirmed', 'request status' ),    // User has confirmed the action.
-		'request-failed'    => __( 'Failed' ),       // User failed to confirm the action.
+		'request-failed'    => _x( 'Failed', 'request status' ),       // User failed to confirm the action.
-		'request-completed' => __( 'Completed' ),    // Admin has handled the request.
+		'request-completed' => _x( 'Completed', 'request status' ),    // Admin has handled the request.
 	);
 }
 /**
 * Register a post status. Do not use before init.
 * 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
+*
 * @global array $wp_post_statuses Inserts new post status object into the list
 *
-* @param string $post_status Name of the post status.
+* @param string       $post_status Name of the post status.
 * @param array|string $args {
 *     Optional. Array or string of post status arguments.
 *
 *     @type bool|string $label                     A descriptive name for the post status marked
 *                                                  for translation. Defaults to value of $post_status.
 *     @type bool|array  $label_count               Descriptive text to use for nooped plurals.
-*                                                  Default array of $label, twice
+*                                                  Default array of $label, twice.
 *     @type bool        $exclude_from_search       Whether to exclude posts with this post status
 *                                                  from search results. Default is value of $internal.
 *     @type bool        $_builtin                  Whether the status is built-in. Core-use only.
 *                                                  Default false.
 *     @type bool        $public                    Whether posts of this status should be shown
 *     @type bool        $private                   Whether posts with this status should be private.
 *                                                  Default false.
 *     @type bool        $publicly_queryable        Whether posts with this status should be publicly-
 *                                                  queryable. Default is value of $public.
 *     @type bool        $show_in_admin_all_list    Whether to include posts in the edit listing for
-*                                                  their post type. Default is value of $internal.
+*                                                  their post type. Default is the opposite value
+*                                                  of $internal.
 *     @type bool        $show_in_admin_status_list Show in the list of statuses with post counts at
 *                                                  the top of the edit listings,
 *                                                  e.g. All (12) | Published (9) | My Custom Status (2)
-*                                                  Default is value of $internal.
+*                                                  Default is the opposite value of $internal.
+*     @type bool        $date_floating             Whether the post has a floating creation date.
+*                                                  Default to false.
 * }
 * @return object
 */
 function register_post_status( $post_status, $args = array() ) {
 	global $wp_post_statuses;
 		'protected'                 => null,
 		'private'                   => null,
 		'publicly_queryable'        => null,
 		'show_in_admin_status_list' => null,
 		'show_in_admin_all_list'    => null,
+		'date_floating'             => null,
 	);
 	$args     = wp_parse_args( $args, $defaults );
 	$args     = (object) $args;
 	$post_status = sanitize_key( $post_status );
 		$args->show_in_admin_all_list = ! $args->internal;
 	}
 	if ( null === $args->show_in_admin_status_list ) {
 		$args->show_in_admin_status_list = ! $args->internal;
+	}
+	if ( null === $args->date_floating ) {
+		$args->date_floating = false;
 	}
 	if ( false === $args->label ) {
 		$args->label = $post_status;
 	}
 * @return array A list of post status names or objects.
 */
 function get_post_stati( $args = array(), $output = 'names', $operator = 'and' ) {
 	global $wp_post_statuses;
-	$field = ( 'names' == $output ) ? 'name' : false;
+	$field = ( 'names' === $output ) ? 'name' : false;
 	return wp_filter_object_list( $wp_post_statuses, $args, $operator, $field );
 }
 /**
 *
 * @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.
 */
 function get_post_type( $post = null ) {
-	if ( $post = get_post( $post ) ) {
+	$post = get_post( $post );
+	if ( $post ) {
 		return $post->post_type;
 	}
 	return false;
 }
 * @return string[]|WP_Post_Type[] An array of post type names or objects.
 */
 function get_post_types( $args = array(), $output = 'names', $operator = 'and' ) {
 	global $wp_post_types;
-	$field = ( 'names' == $output ) ? 'name' : false;
+	$field = ( 'names' === $output ) ? 'name' : false;
 	return wp_filter_object_list( $wp_post_types, $args, $operator, $field );
 }
 /**
 * @since 4.4.0 The `show_ui` argument is now enforced on the post type listing
 *              screen and post editing screen.
 * @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`
 *              arguments to register the post type in REST API.
-*
+* @since 5.3.0 The `supports` argument will now accept an array of arguments for a feature.
+* .
 * @global array $wp_post_types List of post types.
 *
-* @param string $post_type Post type key. Must not exceed 20 characters and may
+* @param string       $post_type Post type key. Must not exceed 20 characters and may
-*                          only contain lowercase alphanumeric characters, dashes,
+*                                only contain lowercase alphanumeric characters, dashes,
-*                          and underscores. See sanitize_key().
+*                                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.
 *                                              Default is value of $labels['name'].
 *                                              * ?{post_type_key}={single_post_slug}
 *                                              * ?{post_type_query_var}={single_post_slug}
 *                                              If not set, the default is inherited from $public.
 *     @type bool        $show_ui               Whether to generate and allow a UI for managing this post type in the
 *                                              admin. Default is value of $public.
-*     @type bool        $show_in_menu          Where to show the post type in the admin menu. To work, $show_ui
+*     @type bool|string $show_in_menu          Where to show the post type in the admin menu. To work, $show_ui
 *                                              must be true. If true, the post type is shown in its own top level
 *                                              menu. If false, no menu is shown. If a string of an existing top
 *                                              level menu (eg. 'tools.php' or 'edit.php?post_type=page'), the post
 *                                              type will be placed as a sub-menu of that.
 *                                              Default is value of $show_ui.
 *     @type bool        $show_in_nav_menus     Makes this post type available for selection in navigation menus.
-*                                              Default is value $public.
+*                                              Default is value of $public.
 *     @type bool        $show_in_admin_bar     Makes this post type available via the admin bar. Default is value
 *                                              of $show_in_menu.
-*     @type bool        $show_in_rest          Whether to add the post type route in the REST API 'wp/v2' namespace.
+*     @type bool        $show_in_rest          Whether to include the post type in the REST API. Set this to true
+*                                              for the post type to be available in the block editor.
 *     @type string      $rest_base             To change the base url of REST API route. Default is $post_type.
 *     @type string      $rest_controller_class REST API Controller class name. Default is 'WP_REST_Posts_Controller'.
 *     @type int         $menu_position         The position in the menu order the post type should appear. To work,
 *                                              $show_in_menu must be true. Default null (at the bottom).
 *     @type string      $menu_icon             The url to the icon to be used for this menu. Pass a base64-encoded
 *                                              add_post_type_support() directly. Core features include 'title',
 *                                              'editor', 'comments', 'revisions', 'trackbacks', 'author', 'excerpt',
 *                                              'page-attributes', 'thumbnail', 'custom-fields', and 'post-formats'.
 *                                              Additionally, the 'revisions' feature dictates whether the post type
 *                                              will store revisions, and the 'comments' feature dictates whether the
-*                                              comments count will show on the edit screen. Defaults is an array
+*                                              comments count will show on the edit screen. A feature can also be
-*                                              containing 'title' and 'editor'.
+*                                              specified as an array of arguments to provide additional information
+*                                              about supporting that feature.
+*                                              Example: `array( 'my_feature', array( 'field' => 'value' ) )`.
+*                                              Default is an array 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()
 *                                              key. If false, a post type cannot be loaded at
 *                                              ?{query_var}={post_slug}. If specified as a string, the query
 *                                              ?{query_var_string}={post_slug} will be valid.
 *     @type bool        $can_export            Whether to allow this post type to be exported. Default true.
 *     @type bool        $delete_with_user      Whether to delete posts of this type when deleting a user. If true,
-*                                              posts of this type belonging to the user will be moved to trash
+*                                              posts of this type belonging to the user will be moved to Trash
 *                                              when then user is deleted. If false, posts of this type belonging
 *                                              to the user will *not* be trashed or deleted. If not set (the default),
 *                                              posts are trashed if post_type_supports('author'). Otherwise posts
 *                                              are not trashed or deleted. Default null.
 *     @type bool        $_builtin              FOR INTERNAL USE ONLY! True if this post type is a native or
 *                                              "built-in" post_type. Default false.
 *     @type string      $_edit_link            FOR INTERNAL USE ONLY! URL segment to use for edit link of
 *                                              this post type. Default 'post.php?post=%d'.
 * }
-* @return WP_Post_Type|WP_Error The registered post type object, or an error object.
+* @return WP_Post_Type|WP_Error The registered post type object on success,
+*                               WP_Error object on failure.
 */
 function register_post_type( $post_type, $args = array() ) {
 	global $wp_post_types;
 	if ( ! is_array( $wp_post_types ) ) {
 		$wp_post_types = array();
 	}
-	// Sanitize post type name
+	// Sanitize post type name.
 	$post_type = sanitize_key( $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.' ), '4.2.0' );
 		return new WP_Error( 'post_type_length_invalid', __( 'Post type names must be between 1 and 20 characters in length.' ) );
 * The capability_type argument can optionally be registered as an array, with
 * the first value being singular and the second plural, e.g. array('story, 'stories')
 * Otherwise, an 's' will be added to the value for the plural form. After
 * registration, capability_type will always be a string of the singular value.
 *
-* By default, seven keys are accepted as part of the capabilities array:
+* By default, eight keys are accepted as part of the capabilities array:
 *
 * - edit_post, read_post, and delete_post are meta capabilities, which are then
 *   generally mapped to corresponding primitive capabilities depending on the
 *   context, which would be the post being edited/read/deleted and the user or
 *   role being checked. Thus these capabilities would generally not be granted
 *
 * - edit_posts - Controls whether objects of this post type can be edited.
 * - edit_others_posts - Controls whether objects of this type owned by other users
 *   can be edited. If the post type does not support an author, then this will
 *   behave like edit_posts.
+* - delete_posts - Controls whether objects of this post type can be deleted.
 * - publish_posts - Controls publishing objects of this post type.
 * - read_private_posts - Controls whether private objects can be read.
 *
-* These four primitive capabilities are checked in core in various locations.
+* These five primitive capabilities are checked in core in various locations.
-* There are also seven other primitive capabilities which are not referenced
+* There are also six other primitive capabilities which are not referenced
 * directly in core, except in map_meta_cap(), which takes the three aforementioned
 * meta capabilities and translates them into one or more primitive capabilities
 * that must then be checked against the user or role, depending on the context.
 *
 * - read - Controls whether objects of this post type can be read.
-* - delete_posts - Controls whether objects of this post type can be deleted.
 * - delete_private_posts - Controls whether private objects can be deleted.
 * - delete_published_posts - Controls whether published objects can be deleted.
 * - delete_others_posts - Controls whether objects owned by other users can be
 *   can be deleted. If the post type does not support an author, then this will
 *   behave like delete_posts.
 * These additional capabilities are only used in map_meta_cap(). Thus, they are
 * only assigned by default if the post type is registered with the 'map_meta_cap'
 * argument set to true (default is false).
 *
 * @since 3.0.0
+* @since 5.4.0 'delete_posts' is included in default capabilities.
 *
 * @see register_post_type()
 * @see map_meta_cap()
 *
 * @param object $args Post type registration arguments.
 	// Singular base for meta capabilities, plural base for primitive capabilities.
 	list( $singular_base, $plural_base ) = $args->capability_type;
 	$default_capabilities = array(
-		// Meta capabilities
+		// Meta capabilities.
 		'edit_post'          => 'edit_' . $singular_base,
 		'read_post'          => 'read_' . $singular_base,
 		'delete_post'        => 'delete_' . $singular_base,
 		// Primitive capabilities used outside of map_meta_cap():
 		'edit_posts'         => 'edit_' . $plural_base,
 		'edit_others_posts'  => 'edit_others_' . $plural_base,
+		'delete_posts'       => 'delete_' . $plural_base,
 		'publish_posts'      => 'publish_' . $plural_base,
 		'read_private_posts' => 'read_private_' . $plural_base,
 	);
 	// Primitive capabilities used within map_meta_cap():
 	if ( $args->map_meta_cap ) {
 		$default_capabilities_for_mapping = array(
 			'read'                   => 'read',
-			'delete_posts'           => 'delete_' . $plural_base,
 			'delete_private_posts'   => 'delete_private_' . $plural_base,
 			'delete_published_posts' => 'delete_published_' . $plural_base,
 			'delete_others_posts'    => 'delete_others_' . $plural_base,
 			'edit_private_posts'     => 'edit_private_' . $plural_base,
 			'edit_published_posts'   => 'edit_published_' . $plural_base,
 * @since 3.1.0
 * @access private
 *
 * @global array $post_type_meta_caps Used to store meta capabilities.
 *
-* @param array $capabilities Post type meta capabilities.
+* @param string[] $capabilities Post type meta capabilities.
 */
 function _post_type_meta_capabilities( $capabilities = null ) {
 	global $post_type_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' ), true ) ) {
 			$post_type_meta_caps[ $custom ] = $core;
 		}
 	}
 }
 *
 * - `name` - General name for the post type, usually plural. The same and overridden
 *          by `$post_type_object->label`. Default is 'Posts' / 'Pages'.
 * - `singular_name` - Name for one object of this post type. Default is 'Post' / 'Page'.
 * - `add_new` - Default is 'Add New' for both hierarchical and non-hierarchical types.
-*             When internationalizing this string, please use a {@link https://codex.wordpress.org/I18n_for_WordPress_Developers#Disambiguation_by_context gettext context}
+*             When internationalizing this string, please use a {@link https://developer.wordpress.org/plugins/internationalization/how-to-internationalize-your-plugin/#disambiguation-by-context gettext context}
 *             matching your post type. Example: `_x( 'Add New', 'product', 'textdomain' );`.
 * - `add_new_item` - Label for adding a new singular item. Default is 'Add New Post' / 'Add New Page'.
 * - `edit_item` - Label for editing a singular item. Default is 'Edit Post' / 'Edit Page'.
 * - `new_item` - Label for the new item page title. Default is 'New Post' / 'New Page'.
 * - `view_item` - Label for viewing a singular item. Default is 'View Post' / 'View Page'.
 * - `view_items` - Label for viewing post type archives. Default is 'View Posts' / 'View Pages'.
 * - `search_items` - Label for searching plural items. Default is 'Search Posts' / 'Search Pages'.
 * - `not_found` - Label used when no items are found. Default is 'No posts found' / 'No pages found'.
-* - `not_found_in_trash` - Label used when no items are in the trash. Default is 'No posts found in Trash' /
+* - `not_found_in_trash` - Label used when no items are in the Trash. Default is 'No posts found in Trash' /
 *                        'No pages found in Trash'.
 * - `parent_item_colon` - Label used to prefix parents of hierarchical items. Not used on non-hierarchical
 *                       post types. Default is 'Parent Page:'.
 * - `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'.
+* - `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' /
 		'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' ) ),
+		'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' ) ),
 */
 function _add_post_type_submenus() {
 	foreach ( get_post_types( array( 'show_ui' => true ) ) as $ptype ) {
 		$ptype_obj = get_post_type_object( $ptype );
 		// Sub-menus only.
-		if ( ! $ptype_obj->show_in_menu || $ptype_obj->show_in_menu === true ) {
+		if ( ! $ptype_obj->show_in_menu || true === $ptype_obj->show_in_menu ) {
 			continue;
 		}
 		add_submenu_page( $ptype_obj->show_in_menu, $ptype_obj->labels->name, $ptype_obj->labels->all_items, $ptype_obj->cap->edit_posts, "edit.php?post_type=$ptype" );
 	}
 }
 /**
-* Register support of certain features for a post type.
+* Registers support of certain features for a post type.
 *
 * All core features are directly associated with a functional area of the edit
 * screen, such as the editor or a meta box. Features include: 'title', 'editor',
 * 'comments', 'revisions', 'trackbacks', 'author', 'excerpt', 'page-attributes',
 * 'thumbnail', 'custom-fields', and 'post-formats'.
 *
 * Additionally, the 'revisions' feature dictates whether the post type will
 * store revisions, and the 'comments' feature dictates whether the comments
 * count will show on the edit screen.
 *
+* A third, optional parameter can also be passed along with a feature to provide
+* additional information about supporting that feature.
+*
+* Example usage:
+*
+*     add_post_type_support( 'my_post_type', 'comments' );
+*     add_post_type_support( 'my_post_type', array(
+*         'author', 'excerpt',
+*     ) );
+*     add_post_type_support( 'my_post_type', 'my_feature', array(
+*         'field' => 'value',
+*     ) );
+*
 * @since 3.0.0
+* @since 5.3.0 Formalized the existing and already documented `...$args` parameter
+*              by adding it to the function signature.
 *
 * @global array $_wp_post_type_features
 *
 * @param string       $post_type The post type for which to add the feature.
 * @param string|array $feature   The feature being added, accepts an array of
 *                                feature strings or a single string.
-*/
+* @param mixed        ...$args   Optional extra arguments to pass along with certain features.
-function add_post_type_support( $post_type, $feature ) {
+*/
+function add_post_type_support( $post_type, $feature, ...$args ) {
 	global $_wp_post_type_features;
 	$features = (array) $feature;
 	foreach ( $features as $feature ) {
-		if ( func_num_args() == 2 ) {
+		if ( $args ) {
+			$_wp_post_type_features[ $post_type ][ $feature ] = $args;
+		} else {
 			$_wp_post_type_features[ $post_type ][ $feature ] = true;
-		} else {
-			$_wp_post_type_features[ $post_type ][ $feature ] = array_slice( func_get_args(), 2 );
 		}
 	}
 }
 /**
 * @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.
+* @return string[] 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 );
 		'meta_value'       => '',
 		'post_type'        => 'post',
 		'suppress_filters' => true,
 	);
-	$r = wp_parse_args( $args, $defaults );
+	$parsed_args = wp_parse_args( $args, $defaults );
-	if ( empty( $r['post_status'] ) ) {
+	if ( empty( $parsed_args['post_status'] ) ) {
-		$r['post_status'] = ( 'attachment' == $r['post_type'] ) ? 'inherit' : 'publish';
+		$parsed_args['post_status'] = ( 'attachment' === $parsed_args['post_type'] ) ? 'inherit' : 'publish';
 	}
-	if ( ! empty( $r['numberposts'] ) && empty( $r['posts_per_page'] ) ) {
+	if ( ! empty( $parsed_args['numberposts'] ) && empty( $parsed_args['posts_per_page'] ) ) {
-		$r['posts_per_page'] = $r['numberposts'];
+		$parsed_args['posts_per_page'] = $parsed_args['numberposts'];
 	}
-	if ( ! empty( $r['category'] ) ) {
+	if ( ! empty( $parsed_args['category'] ) ) {
-		$r['cat'] = $r['category'];
+		$parsed_args['cat'] = $parsed_args['category'];
 	}
-	if ( ! empty( $r['include'] ) ) {
+	if ( ! empty( $parsed_args['include'] ) ) {
-		$incposts            = wp_parse_id_list( $r['include'] );
+		$incposts                      = wp_parse_id_list( $parsed_args['include'] );
-		$r['posts_per_page'] = count( $incposts );  // only the number of posts included
+		$parsed_args['posts_per_page'] = count( $incposts );  // Only the number of posts included.
-		$r['post__in']       = $incposts;
+		$parsed_args['post__in']       = $incposts;
-	} elseif ( ! empty( $r['exclude'] ) ) {
+	} elseif ( ! empty( $parsed_args['exclude'] ) ) {
-		$r['post__not_in'] = wp_parse_id_list( $r['exclude'] );
+		$parsed_args['post__not_in'] = wp_parse_id_list( $parsed_args['exclude'] );
 	}
-	$r['ignore_sticky_posts'] = true;
+	$parsed_args['ignore_sticky_posts'] = true;
-	$r['no_found_rows']       = true;
+	$parsed_args['no_found_rows']       = true;
 	$get_posts = new WP_Query;
-	return $get_posts->query( $r );
+	return $get_posts->query( $parsed_args );
 }
 //
-// Post meta functions
+// Post meta functions.
 //
 /**
 * Adds a meta field to the given post.
 *
 *
 * @since 1.5.0
 *
 * @param int    $post_id    Post ID.
 * @param string $meta_key   Metadata name.
-* @param mixed  $meta_value Optional. Metadata value. Must be serializable if
+* @param mixed  $meta_value Optional. Metadata value. If provided,
-*                           non-scalar. Default empty.
+*                           rows will only be removed that match the value.
+*                           Must be serializable if non-scalar. Default empty.
 * @return bool True on success, false on failure.
 */
 function delete_post_meta( $post_id, $meta_key, $meta_value = '' ) {
 	// Make sure meta is added to the post, not a revision.
 	$the_post = wp_is_post_revision( $post_id );
 * Retrieves a post meta field for the given post ID.
 *
 * @since 1.5.0
 *
 * @param int    $post_id Post ID.
-* @param string $key     Optional. The meta key to retrieve. By default, returns
+* @param string $key     Optional. The meta key to retrieve. By default,
-*                        data for all keys. Default empty.
+*                        returns data for all keys. Default empty.
-* @param bool   $single  Optional. If true, returns only the first value for the specified meta key.
+* @param bool   $single  Optional. Whether to return a single value.
-*                        This parameter has no effect if $key is not specified. Default false.
+*                        This parameter has no effect if $key is not specified.
-* @return mixed Will be an array if $single is false. Will be value of the meta
+*                        Default false.
-*               field if $single is true.
+* @return mixed An array if $single is false. The value of the meta field
+*               if $single is true. False for an invalid $post_id.
 */
 function get_post_meta( $post_id, $key = '', $single = false ) {
 	return get_metadata( 'post', $post_id, $key, $single );
 }
 *
 * @param int    $post_id    Post ID.
 * @param string $meta_key   Metadata key.
 * @param mixed  $meta_value Metadata value. Must be serializable if non-scalar.
 * @param mixed  $prev_value Optional. Previous value to check before updating.
-* @return int|bool The new meta field ID if a field with the given key didn't exist and was
+*                           If specified, only update existing metadata entries with
-*                  therefore added, true on successful update, false on failure.
+*                           this value. Otherwise, update all entries. Default empty.
+* @return int|bool Meta ID if the key didn't exist, true on successful update,
+*                  false on failure or if the value passed to the function
+*                  is the same as the one that is already in the database.
 */
 function update_post_meta( $post_id, $meta_key, $meta_value, $prev_value = '' ) {
 	// Make sure meta is added to the post, not a revision.
 	$the_post = wp_is_post_revision( $post_id );
 	if ( $the_post ) {
 	if ( ! is_array( $custom ) ) {
 		return;
 	}
-	if ( $keys = array_keys( $custom ) ) {
+	$keys = array_keys( $custom );
+	if ( $keys ) {
 		return $keys;
 	}
 }
 /**
 		$post_id = get_the_ID();
 	}
 	$stickies = get_option( 'sticky_posts' );
-	if ( ! is_array( $stickies ) ) {
+	if ( is_array( $stickies ) ) {
-		return false;
+		$stickies  = array_map( 'intval', $stickies );
-	}
+		$is_sticky = in_array( $post_id, $stickies, true );
+	} else {
-	if ( in_array( $post_id, $stickies ) ) {
+		$is_sticky = false;
-		return true;
+	}
-	}
+	/**
-	return false;
+	 * Filters whether a post is sticky.
+	 *
+	 * @since 5.3.0
+	 *
+	 * @param bool $is_sticky Whether a post is sticky.
+	 * @param int  $post_id   Post ID.
+	 */
+	return apply_filters( 'is_sticky', $is_sticky, $post_id );
 }
 /**
 * Sanitize every post field.
 *
 	}
 	return $post;
 }
 /**
-* Sanitize post field based on context.
+* Sanitizes a post field based on context.
 *
 * Possible context values are:  'raw', 'edit', 'db', 'display', 'attribute' and
 * 'js'. The 'display' context is used by default. 'attribute' and 'js' contexts
 * are treated like 'display' when calling filters.
 *
 * @since 4.4.0 Like `sanitize_post()`, `$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 Optional. How to sanitize post fields. Looks for 'raw', 'edit',
+* @param string $context Optional. How to sanitize the field. Possible values are 'raw', 'edit',
 *                        'db', 'display', 'attribute' and 'js'. Default 'display'.
 * @return mixed Sanitized value.
 */
 function sanitize_post_field( $field, $value, $post_id, $context = 'display' ) {
 	$int_fields = array( 'ID', 'post_parent', 'menu_order' );
-	if ( in_array( $field, $int_fields ) ) {
+	if ( in_array( $field, $int_fields, true ) ) {
 		$value = (int) $value;
 	}
 	// Fields which contain arrays of integers.
 	$array_int_fields = array( 'ancestors' );
-	if ( in_array( $field, $array_int_fields ) ) {
+	if ( in_array( $field, $array_int_fields, true ) ) {
 		$value = array_map( 'absint', $value );
 		return $value;
 	}
-	if ( 'raw' == $context ) {
+	if ( 'raw' === $context ) {
 		return $value;
 	}
 	$prefixed = false;
 	if ( false !== strpos( $field, 'post_' ) ) {
 		$prefixed        = true;
 		$field_no_prefix = str_replace( 'post_', '', $field );
 	}
-	if ( 'edit' == $context ) {
+	if ( 'edit' === $context ) {
 		$format_to_edit = array( 'post_content', 'post_excerpt', 'post_title', 'post_password' );
 		if ( $prefixed ) {
 			/**
 			$value = apply_filters( "{$field_no_prefix}_edit_pre", $value, $post_id );
 		} else {
 			$value = apply_filters( "edit_post_{$field}", $value, $post_id );
 		}
-		if ( in_array( $field, $format_to_edit ) ) {
+		if ( in_array( $field, $format_to_edit, true ) ) {
-			if ( 'post_content' == $field ) {
+			if ( 'post_content' === $field ) {
 				$value = format_to_edit( $value, user_can_richedit() );
 			} else {
 				$value = format_to_edit( $value );
 			}
 		} else {
 			$value = esc_attr( $value );
 		}
-	} elseif ( 'db' == $context ) {
+	} elseif ( 'db' === $context ) {
 		if ( $prefixed ) {
 			/**
 			 * Filters the value of a specific post field before saving.
 			 *
 			 * @since 2.3.0
 			 *
 			 * @param mixed  $value   Value of the prefixed post field.
 			 * @param int    $post_id Post ID.
 			 * @param string $context Context for how to sanitize the field. Possible
-			 *                        values include 'raw', 'edit', 'db', 'display',
+			 *                        values include 'edit', 'display',
 			 *                        'attribute' and 'js'.
 			 */
 			$value = apply_filters( "{$field}", $value, $post_id, $context );
 		} else {
 			$value = apply_filters( "post_{$field}", $value, $post_id, $context );
 		}
-		if ( 'attribute' == $context ) {
+		if ( 'attribute' === $context ) {
 			$value = esc_attr( $value );
-		} elseif ( 'js' == $context ) {
+		} elseif ( 'js' === $context ) {
 			$value = esc_js( $value );
 		}
 	}
 	return $value;
 * @since 2.7.0
 *
 * @param int $post_id Post ID.
 */
 function stick_post( $post_id ) {
+	$post_id  = (int) $post_id;
 	$stickies = get_option( 'sticky_posts' );
 	if ( ! is_array( $stickies ) ) {
-		$stickies = array( $post_id );
+		$stickies = array();
 	}
-	if ( ! in_array( $post_id, $stickies ) ) {
+	$stickies = array_map( 'intval', $stickies );
+	if ( ! in_array( $post_id, $stickies, true ) ) {
 		$stickies[] = $post_id;
 	}
 	$updated = update_option( 'sticky_posts', $stickies );
 * @since 2.7.0
 *
 * @param int $post_id Post ID.
 */
 function unstick_post( $post_id ) {
+	$post_id  = (int) $post_id;
 	$stickies = get_option( 'sticky_posts' );
 	if ( ! is_array( $stickies ) ) {
 		return;
 	}
-	if ( ! in_array( $post_id, $stickies ) ) {
+	$stickies = array_map( 'intval', $stickies );
+	if ( ! in_array( $post_id, $stickies, true ) ) {
 		return;
 	}
-	$offset = array_search( $post_id, $stickies );
+	$offset = array_search( $post_id, $stickies, true );
 	if ( false === $offset ) {
 		return;
 	}
 	array_splice( $stickies, $offset, 1 );
 * @param string $perm Optional. 'readable' or empty. Default empty.
 * @return string The cache key.
 */
 function _count_posts_cache_key( $type = 'post', $perm = '' ) {
 	$cache_key = 'posts-' . $type;
-	if ( 'readable' == $perm && is_user_logged_in() ) {
+	if ( 'readable' === $perm && is_user_logged_in() ) {
 		$post_type_object = get_post_type_object( $type );
 		if ( $post_type_object && ! current_user_can( $post_type_object->cap->read_private_posts ) ) {
 			$cache_key .= '_' . $perm . '_' . get_current_user_id();
 		}
 	}
 	return $cache_key;
 }
 /**
 * Count number of posts of a post type and if user has permissions to view.
 	$cache_key = _count_posts_cache_key( $type, $perm );
 	$counts = wp_cache_get( $cache_key, 'counts' );
 	if ( false !== $counts ) {
+		// We may have cached this before every status was registered.
+		foreach ( get_post_stati() as $status ) {
+			if ( ! isset( $counts->{$status} ) ) {
+				$counts->{$status} = 0;
+			}
+		}
 		/** This filter is documented in wp-includes/post.php */
 		return apply_filters( 'wp_count_posts', $counts, $type, $perm );
 	}
 	$query = "SELECT post_status, COUNT( * ) AS num_posts FROM {$wpdb->posts} WHERE post_type = %s";
-	if ( 'readable' == $perm && is_user_logged_in() ) {
+	if ( 'readable' === $perm && is_user_logged_in() ) {
 		$post_type_object = get_post_type_object( $type );
 		if ( ! current_user_can( $post_type_object->cap->read_private_posts ) ) {
 			$query .= $wpdb->prepare(
 				" AND (post_status != 'private' OR ( post_author = %d AND post_status = 'private' ))",
 				get_current_user_id()
 			);
 		}
 	}
 	$query .= ' GROUP BY post_status';
 	$results = (array) $wpdb->get_results( $wpdb->prepare( $query, $type ), ARRAY_A );
 	$counts  = array_fill_keys( get_post_stati(), 0 );
 /**
 * Get default post mime types.
 *
 * @since 2.9.0
+* @since 5.3.0 Added the 'Documents', 'Spreadsheets', and 'Archives' mime type groups.
 *
 * @return array List of post mime types.
 */
 function get_post_mime_types() {
-	$post_mime_types = array(   //	array( adj, noun )
+	$post_mime_types = array(   // array( adj, noun )
-		'image' => array( __( 'Images' ), __( 'Manage Images' ), _n_noop( 'Image <span class="count">(%s)</span>', 'Images <span class="count">(%s)</span>' ) ),
+		'image'       => array(
-		'audio' => array( __( 'Audio' ), __( 'Manage Audio' ), _n_noop( 'Audio <span class="count">(%s)</span>', 'Audio <span class="count">(%s)</span>' ) ),
+			__( 'Images' ),
-		'video' => array( __( 'Video' ), __( 'Manage Video' ), _n_noop( 'Video <span class="count">(%s)</span>', 'Video <span class="count">(%s)</span>' ) ),
+			__( 'Manage Images' ),
+			/* translators: %s: Number of images. */
+			_n_noop(
+				'Image <span class="count">(%s)</span>',
+				'Images <span class="count">(%s)</span>'
+			),
+		),
+		'audio'       => array(
+			__( 'Audio' ),
+			__( 'Manage Audio' ),
+			/* translators: %s: Number of audio files. */
+			_n_noop(
+				'Audio <span class="count">(%s)</span>',
+				'Audio <span class="count">(%s)</span>'
+			),
+		),
+		'video'       => array(
+			__( 'Video' ),
+			__( 'Manage Video' ),
+			/* translators: %s: Number of video files. */
+			_n_noop(
+				'Video <span class="count">(%s)</span>',
+				'Video <span class="count">(%s)</span>'
+			),
+		),
+		'document'    => array(
+			__( 'Documents' ),
+			__( 'Manage Documents' ),
+			/* translators: %s: Number of documents. */
+			_n_noop(
+				'Document <span class="count">(%s)</span>',
+				'Documents <span class="count">(%s)</span>'
+			),
+		),
+		'spreadsheet' => array(
+			__( 'Spreadsheets' ),
+			__( 'Manage Spreadsheets' ),
+			/* translators: %s: Number of spreadsheets. */
+			_n_noop(
+				'Spreadsheet <span class="count">(%s)</span>',
+				'Spreadsheets <span class="count">(%s)</span>'
+			),
+		),
+		'archive'     => array(
+			_x( 'Archives', 'file type group' ),
+			__( 'Manage Archives' ),
+			/* translators: %s: Number of archives. */
+			_n_noop(
+				'Archive <span class="count">(%s)</span>',
+				'Archives <span class="count">(%s)</span>'
+			),
+		),
 	);
+	$ext_types  = wp_get_ext_types();
+	$mime_types = wp_get_mime_types();
+	foreach ( $post_mime_types as $group => $labels ) {
+		if ( in_array( $group, array( 'image', 'audio', 'video' ), true ) ) {
+			continue;
+		}
+		if ( ! isset( $ext_types[ $group ] ) ) {
+			unset( $post_mime_types[ $group ] );
+			continue;
+		}
+		$group_mime_types = array();
+		foreach ( $ext_types[ $group ] as $extension ) {
+			foreach ( $mime_types as $exts => $mime ) {
+				if ( preg_match( '!^(' . $exts . ')$!i', $extension ) ) {
+					$group_mime_types[] = $mime;
+					break;
+				}
+			}
+		}
+		$group_mime_types = implode( ',', array_unique( $group_mime_types ) );
+		$post_mime_types[ $group_mime_types ] = $labels;
+		unset( $post_mime_types[ $group ] );
+	}
 	/**
 	 * Filters the default list of post mime types.
 	 *
 	 * @since 2.5.0
 	$wild       = '[-._a-z0-9]*';
 	foreach ( (array) $wildcard_mime_types as $type ) {
 		$mimes = array_map( 'trim', explode( ',', $type ) );
 		foreach ( $mimes as $mime ) {
-			$regex                 = str_replace( '__wildcard__', $wild, preg_quote( str_replace( '*', '__wildcard__', $mime ) ) );
+			$regex = str_replace( '__wildcard__', $wild, preg_quote( str_replace( '*', '__wildcard__', $mime ) ) );
 			$patternses[][ $type ] = "^$regex$";
 			if ( false === strpos( $mime, '/' ) ) {
 				$patternses[][ $type ] = "^$regex/";
 				$patternses[][ $type ] = $regex;
 			}
 		}
 	asort( $patternses );
 	foreach ( $patternses as $patterns ) {
 		foreach ( $patterns as $type => $pattern ) {
 			foreach ( (array) $real_mime_types as $real ) {
-				if ( preg_match( "#$pattern#", $real ) && ( empty( $matches[ $type ] ) || false === array_search( $real, $matches[ $type ] ) ) ) {
+				if ( preg_match( "#$pattern#", $real )
+					&& ( empty( $matches[ $type ] ) || false === array_search( $real, $matches[ $type ], true ) )
+				) {
 					$matches[ $type ][] = $real;
 				}
 			}
 		}
 	}
 	return $matches;
 }
 /**
 * Convert MIME types into SQL.
 			}
 		}
 		$mime_pattern = preg_replace( '/\*+/', '%', $mime_pattern );
-		if ( in_array( $mime_type, $wildcards ) ) {
+		if ( in_array( $mime_type, $wildcards, true ) ) {
 			return '';
 		}
 		if ( false !== strpos( $mime_pattern, '%' ) ) {
 			$wheres[] = empty( $table_alias ) ? "post_mime_type LIKE '$mime_pattern'" : "$table_alias.post_mime_type LIKE '$mime_pattern'";
 		} else {
 			$wheres[] = empty( $table_alias ) ? "post_mime_type = '$mime_pattern'" : "$table_alias.post_mime_type = '$mime_pattern'";
 		}
 	}
 	if ( ! empty( $wheres ) ) {
 		$where = ' AND (' . join( ' OR ', $wheres ) . ') ';
 	}
 	return $where;
 }
 /**
 * Trash or delete a post or page.
 *
 * When the post and page is permanently deleted, everything that is tied to
 * it is deleted also. This includes comments, post meta fields, and terms
 * associated with the post.
 *
-* The post or page is moved to trash instead of permanently deleted unless
+* The post or page is moved to Trash instead of permanently deleted unless
-* trash is disabled, item is already in the trash, or $force_delete is true.
+* Trash is disabled, item is already in the Trash, or $force_delete is true.
 *
 * @since 1.0.0
 *
 * @global wpdb $wpdb WordPress database abstraction object.
 * @see wp_delete_attachment()
 * @see wp_trash_post()
 *
 * @param int  $postid       Optional. Post ID. Default 0.
-* @param bool $force_delete Optional. Whether to bypass trash and force deletion.
+* @param bool $force_delete Optional. Whether to bypass Trash and force deletion.
 *                           Default false.
 * @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;
 	/**
 	 * Filters whether a post deletion should take place.
 	 *
 	 * @since 4.4.0
 	 *
-	 * @param bool    $delete       Whether to go forward with deletion.
+	 * @param bool|null $delete       Whether to go forward with deletion.
-	 * @param WP_Post $post         Post object.
+	 * @param WP_Post   $post         Post object.
-	 * @param bool    $force_delete Whether to bypass the trash.
+	 * @param bool      $force_delete Whether to bypass the Trash.
 	 */
 	$check = apply_filters( 'pre_delete_post', null, $post, $force_delete );
 	if ( null !== $check ) {
 		return $check;
 	}
 	/**
 	 * Fires before a post is deleted, at the start of wp_delete_post().
 	 *
 	 * @since 3.2.0
+	 * @since 5.5.0 Added the `$post` parameter.
 	 *
 	 * @see wp_delete_post()
 	 *
-	 * @param int $postid Post ID.
+	 * @param int     $postid Post ID.
+	 * @param WP_Post $post   Post object.
 	 */
-	do_action( 'before_delete_post', $postid );
+	do_action( 'before_delete_post', $postid, $post );
 	delete_post_meta( $postid, '_wp_trash_meta_status' );
 	delete_post_meta( $postid, '_wp_trash_meta_time' );
 	wp_delete_object_term_relationships( $postid, get_object_taxonomies( $post->post_type ) );
 	/**
 	 * Fires immediately before a post is deleted from the database.
 	 *
 	 * @since 1.2.0
-	 *
+	 * @since 5.5.0 Added the `$post` parameter.
-	 * @param int $postid Post ID.
+	 *
+	 * @param int     $postid Post ID.
+	 * @param WP_Post $post   Post object.
 	 */
-	do_action( 'delete_post', $postid );
+	do_action( 'delete_post', $postid, $post );
 	$result = $wpdb->delete( $wpdb->posts, array( 'ID' => $postid ) );
 	if ( ! $result ) {
 		return false;
 	}
 	/**
 	 * Fires immediately after a post is deleted from the database.
 	 *
 	 * @since 2.2.0
-	 *
+	 * @since 5.5.0 Added the `$post` parameter.
-	 * @param int $postid Post ID.
+	 *
+	 * @param int     $postid Post ID.
+	 * @param WP_Post $post   Post object.
 	 */
-	do_action( 'deleted_post', $postid );
+	do_action( 'deleted_post', $postid, $post );
 	clean_post_cache( $post );
 	if ( is_post_type_hierarchical( $post->post_type ) && $children ) {
 		foreach ( $children as $child ) {
 	/**
 	 * Fires after a post is deleted, at the conclusion of wp_delete_post().
 	 *
 	 * @since 3.2.0
+	 * @since 5.5.0 Added the `$post` parameter.
 	 *
 	 * @see wp_delete_post()
 	 *
-	 * @param int $postid Post ID.
+	 * @param int     $postid Post ID.
+	 * @param WP_Post $post   Post object.
 	 */
-	do_action( 'after_delete_post', $postid );
+	do_action( 'after_delete_post', $postid, $post );
 	return $post;
 }
 /**
 *
 * @param int $post_id Post ID.
 */
 function _reset_front_page_settings_for_post( $post_id ) {
 	$post = get_post( $post_id );
-	if ( 'page' == $post->post_type ) {
+	if ( 'page' === $post->post_type ) {
 		/*
-		  * If the page is defined in option page_on_front or post_for_posts,
+		 * If the page is defined in option page_on_front or post_for_posts,
-		  * adjust the corresponding options.
+		 * adjust the corresponding options.
-		  */
+		 */
 		if ( get_option( 'page_on_front' ) == $post->ID ) {
 			update_option( 'show_on_front', 'posts' );
 			update_option( 'page_on_front', 0 );
 		}
 		if ( get_option( 'page_for_posts' ) == $post->ID ) {
-			delete_option( 'page_for_posts', 0 );
+			update_option( 'page_for_posts', 0 );
 		}
 	}
 	unstick_post( $post->ID );
 }
 /**
 * Move a post or page to the Trash
 *
-* If trash is disabled, the post or page is permanently deleted.
+* If Trash is disabled, the post or page is permanently deleted.
 *
 * @since 2.9.0
 *
 * @see wp_delete_post()
 *
 	/**
 	 * Filters whether a post trashing should take place.
 	 *
 	 * @since 4.9.0
 	 *
-	 * @param bool    $trash Whether to go forward with trashing.
+	 * @param bool|null $trash Whether to go forward with trashing.
-	 * @param WP_Post $post  Post object.
+	 * @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.
+	 * Fires before a post is sent to the Trash.
 	 *
 	 * @since 3.3.0
 	 *
 	 * @param int $post_id Post ID.
 	 */
 	do_action( 'wp_trash_post', $post_id );
 	add_post_meta( $post_id, '_wp_trash_meta_status', $post->post_status );
 	add_post_meta( $post_id, '_wp_trash_meta_time', time() );
-	wp_update_post(
+	$post_updated = wp_update_post(
 		array(
 			'ID'          => $post_id,
 			'post_status' => 'trash',
 		)
 	);
+	if ( ! $post_updated ) {
+		return false;
+	}
 	wp_trash_post_comments( $post_id );
 	/**
-	 * Fires after a post is sent to the trash.
+	 * Fires after a post is sent to the Trash.
 	 *
 	 * @since 2.9.0
 	 *
 	 * @param int $post_id Post ID.
 	 */
 	/**
 	 * Filters whether a post untrashing should take place.
 	 *
 	 * @since 4.9.0
 	 *
-	 * @param bool    $untrash Whether to go forward with untrashing.
+	 * @param bool|null $untrash Whether to go forward with untrashing.
-	 * @param WP_Post $post    Post object.
+	 * @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.
+	 * Fires before a post is restored from the Trash.
 	 *
 	 * @since 2.9.0
 	 *
 	 * @param int $post_id Post ID.
 	 */
 	$post_status = get_post_meta( $post_id, '_wp_trash_meta_status', true );
 	delete_post_meta( $post_id, '_wp_trash_meta_status' );
 	delete_post_meta( $post_id, '_wp_trash_meta_time' );
-	wp_update_post(
+	$post_updated = wp_update_post(
 		array(
 			'ID'          => $post_id,
 			'post_status' => $post_status,
 		)
 	);
+	if ( ! $post_updated ) {
+		return false;
+	}
 	wp_untrash_post_comments( $post_id );
 	/**
-	 * Fires after a post is restored from the trash.
+	 * Fires after a post is restored from the Trash.
 	 *
 	 * @since 2.9.0
 	 *
 	 * @param int $post_id Post ID.
 	 */
 	return $post;
 }
 /**
-* Moves comments for a post to the trash.
+* Moves comments for a post to the Trash.
 *
 * @since 2.9.0
 *
 * @global wpdb $wpdb WordPress database abstraction object.
 *
 	}
 	$post_id = $post->ID;
 	/**
-	 * Fires before comments are sent to the trash.
+	 * Fires before comments are sent to the Trash.
 	 *
 	 * @since 2.9.0
 	 *
 	 * @param int $post_id Post ID.
 	 */
 	$result = $wpdb->update( $wpdb->comments, array( 'comment_approved' => 'post-trashed' ), array( 'comment_post_ID' => $post_id ) );
 	clean_comment_cache( array_keys( $statuses ) );
 	/**
-	 * Fires after comments are sent to the trash.
+	 * Fires after comments are sent to the Trash.
 	 *
 	 * @since 2.9.0
 	 *
 	 * @param int   $post_id  Post ID.
 	 * @param array $statuses Array of comment statuses.
 	return $result;
 }
 /**
-* Restore comments for a post from the trash.
+* Restore comments for a post from the Trash.
 *
 * @since 2.9.0
 *
 * @global wpdb $wpdb WordPress database abstraction object.
 *
 	if ( empty( $statuses ) ) {
 		return true;
 	}
 	/**
-	 * Fires before comments are restored for a post from the trash.
+	 * Fires before comments are restored for a post from the Trash.
 	 *
 	 * @since 2.9.0
 	 *
 	 * @param int $post_id Post ID.
 	 */
 		$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( ', ', 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' );
 	/**
-	 * Fires after comments are restored for a post from the trash.
+	 * Fires after comments are restored for a post from the Trash.
 	 *
 	 * @since 2.9.0
 	 *
 	 * @param int $post_id Post ID.
 	 */
 *                       global $post. Default 0.
 * @param array $args    Optional. Category query parameters. Default empty array.
 *                       See WP_Term_Query::__construct() for supported arguments.
 * @return array|WP_Error List of categories. If the `$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 `$fields` is 'names', an array of category names.
+*                        is 'ids', an array of category IDs. If `$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;
 * @since 1.0.0
 *
 * @see get_posts()
 *
 * @param array  $args   Optional. Arguments to retrieve posts. Default empty array.
-* @param string $output Optional. The required return type. One of OBJECT or ARRAY_A, which correspond to
+* @param string $output Optional. The required return type. One of OBJECT or ARRAY_A, which
-*                       a WP_Post object or an associative array, respectively. Default ARRAY_A.
+*                       correspond to a WP_Post object or an associative array, respectively.
-* @return array|false Array of recent posts, where the type of each element is determined by $output parameter.
+*                       Default ARRAY_A.
-*                     Empty array on failure.
+* @return array|false Array of recent posts, where the type of each element is determined
+*                     by the `$output` parameter. Empty array on failure.
 */
 function wp_get_recent_posts( $args = array(), $output = ARRAY_A ) {
 	if ( is_numeric( $args ) ) {
 		_deprecated_argument( __FUNCTION__, '3.1.0', __( 'Passing an integer number of posts is deprecated. Pass an array of arguments instead.' ) );
 		'post_type'        => 'post',
 		'post_status'      => 'draft, publish, future, pending, private',
 		'suppress_filters' => true,
 	);
-	$r = wp_parse_args( $args, $defaults );
+	$parsed_args = wp_parse_args( $args, $defaults );
-	$results = get_posts( $r );
+	$results = get_posts( $parsed_args );
 	// Backward compatibility. Prior to 3.1 expected posts to be returned in array.
 	if ( ARRAY_A == $output ) {
 		foreach ( $results as $key => $result ) {
 			$results[ $key ] = get_object_vars( $result );
 * @return 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;
+	// Capture original pre-sanitized array for passing into filters.
+	$unsanitized_postarr = $postarr;
 	$user_id = get_current_user_id();
 	$defaults = array(
 		'post_author'           => $user_id,
 		'post_content'          => '',
 		$update = true;
 		// Get the post ID and GUID.
 		$post_ID     = $postarr['ID'];
 		$post_before = get_post( $post_ID );
 		if ( is_null( $post_before ) ) {
 			if ( $wp_error ) {
 				return new WP_Error( 'invalid_post', __( 'Invalid post ID.' ) );
 			}
 			return 0;
 	$post_type = empty( $postarr['post_type'] ) ? 'post' : $postarr['post_type'];
 	$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;
 	 *
 	 * The post is considered "empty" if both:
 	 * 1. The post type supports the title, editor, and excerpt fields
 	 * 2. The title, editor, and excerpt fields are all empty
 	 *
-	 * Returning a truthy value to the filter will effectively short-circuit
+	 * Returning a truthy value from the filter will effectively short-circuit
-	 * the new post being inserted, returning 0. If $wp_error is true, a WP_Error
+	 * the new post being inserted and return 0. If $wp_error is true, a WP_Error
 	 * will be returned instead.
 	 *
 	 * @since 3.3.0
 	 *
 	 * @param bool  $maybe_empty Whether the post should be considered "empty".
 			return 0;
 		}
 	}
 	$post_status = empty( $postarr['post_status'] ) ? 'draft' : $postarr['post_status'];
 	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.
 		$post_category = array_filter( $postarr['post_category'] );
 	}
 	// Make sure we set a valid category.
-	if ( empty( $post_category ) || 0 == count( $post_category ) || ! is_array( $post_category ) ) {
+	if ( empty( $post_category ) || 0 === count( $post_category ) || ! is_array( $post_category ) ) {
 		// 'post' requires at least one category.
-		if ( 'post' == $post_type && 'auto-draft' != $post_status ) {
+		if ( 'post' === $post_type && 'auto-draft' !== $post_status ) {
 			$post_category = array( get_option( 'default_category' ) );
 		} else {
 			$post_category = array();
 		}
 	}
 	/*
 	 * Create a valid post name. Drafts and pending posts are allowed to have
 	 * an empty post name.
 	 */
 	if ( empty( $post_name ) ) {
-		if ( ! in_array( $post_status, array( 'draft', 'pending', 'auto-draft' ) ) ) {
+		if ( ! in_array( $post_status, array( 'draft', 'pending', 'auto-draft' ), true ) ) {
 			$post_name = sanitize_title( $post_title );
 		} else {
 			$post_name = '';
 		}
 	} else {
 		// On updates, we need to check to see if it's using the old, fixed sanitization context.
 		$check_name = sanitize_title( $post_name, '', 'old-save' );
 		if ( $update && strtolower( urlencode( $post_name ) ) == $check_name && get_post_field( 'post_name', $post_ID ) == $check_name ) {
 			$post_name = $check_name;
 		} else { // new post, or slug has changed.
 			$post_name = sanitize_title( $post_name );
 		}
 	/*
 	 * If the post date is empty (due to having been new or a draft) and status
 	 * is not 'draft' or 'pending', set date to now.
 	 */
-	if ( empty( $postarr['post_date'] ) || '0000-00-00 00:00:00' == $postarr['post_date'] ) {
+	if ( empty( $postarr['post_date'] ) || '0000-00-00 00:00:00' === $postarr['post_date'] ) {
-		if ( empty( $postarr['post_date_gmt'] ) || '0000-00-00 00:00:00' == $postarr['post_date_gmt'] ) {
+		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 {
 		} else {
 			return 0;
 		}
 	}
-	if ( empty( $postarr['post_date_gmt'] ) || '0000-00-00 00:00:00' == $postarr['post_date_gmt'] ) {
+	if ( empty( $postarr['post_date_gmt'] ) || '0000-00-00 00:00:00' === $postarr['post_date_gmt'] ) {
-		if ( ! in_array( $post_status, array( 'draft', 'pending', 'auto-draft' ) ) ) {
+		if ( ! in_array( $post_status, get_post_stati( array( 'date_floating' => true ) ), true ) ) {
 			$post_date_gmt = get_gmt_from_date( $post_date );
 		} else {
 			$post_date_gmt = '0000-00-00 00:00:00';
 		}
 	} else {
 		$post_date_gmt = $postarr['post_date_gmt'];
 	}
-	if ( $update || '0000-00-00 00:00:00' == $post_date ) {
+	if ( $update || '0000-00-00 00:00:00' === $post_date ) {
 		$post_modified     = current_time( 'mysql' );
 		$post_modified_gmt = current_time( 'mysql', 1 );
 	} else {
 		$post_modified     = $post_date;
 		$post_modified_gmt = $post_date_gmt;
 	}
 	if ( 'attachment' !== $post_type ) {
-		if ( 'publish' == $post_status ) {
+		$now = gmdate( 'Y-m-d H:i:s' );
-			$now = gmdate( 'Y-m-d H:i:59' );
-			if ( mysql2date( 'U', $post_date_gmt, false ) > mysql2date( 'U', $now, false ) ) {
+		if ( 'publish' === $post_status ) {
+			if ( strtotime( $post_date_gmt ) - strtotime( $now ) >= MINUTE_IN_SECONDS ) {
 				$post_status = 'future';
 			}
-		} elseif ( 'future' == $post_status ) {
+		} elseif ( 'future' === $post_status ) {
-			$now = gmdate( 'Y-m-d H:i:59' );
+			if ( strtotime( $post_date_gmt ) - strtotime( $now ) < MINUTE_IN_SECONDS ) {
-			if ( mysql2date( 'U', $post_date_gmt, false ) <= mysql2date( 'U', $now, false ) ) {
 				$post_status = 'publish';
 			}
 		}
 	}
 	} else {
 		$menu_order = 0;
 	}
 	$post_password = isset( $postarr['post_password'] ) ? $postarr['post_password'] : '';
-	if ( 'private' == $post_status ) {
+	if ( 'private' === $post_status ) {
 		$post_password = '';
 	}
 	if ( isset( $postarr['post_parent'] ) ) {
 		$post_parent = (int) $postarr['post_parent'];
 	 * 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 );
+		/**
+		 * Filters whether or not to add a `__trashed` suffix to trashed posts that match the name of the updated post.
+		 *
+		 * @since 5.4.0
+		 *
+		 * @param bool   $add_trashed_suffix Whether to attempt to add the suffix.
+		 * @param string $post_name          The name of the post being updated.
+		 * @param int    $post_ID            Post ID.
+		 */
+		$add_trashed_suffix = apply_filters( 'add_trashed_suffix_to_trashed_posts', true, $post_name, $post_ID );
+		if ( $add_trashed_suffix ) {
+			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 );
 	$emoji_fields = array( 'post_title', 'post_content', 'post_excerpt' );
 	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' === $post_type ) {
 		/**
 		 * Filters attachment post data before it is updated in or added to the database.
 		 *
 		 * @since 3.9.0
+		 * @since 5.4.1 `$unsanitized_postarr` argument added.
 		 *
-		 * @param array $data    An array of sanitized attachment post data.
+		 * @param array $data                An array of slashed, sanitized, and processed attachment post data.
-		 * @param array $postarr An array of unsanitized attachment post data.
+		 * @param array $postarr             An array of slashed and sanitized attachment post data, but not processed.
+		 * @param array $unsanitized_postarr An array of slashed yet *unsanitized* and unprocessed attachment post data
+		 *                                   as originally passed to wp_insert_post().
 		 */
-		$data = apply_filters( 'wp_insert_attachment_data', $data, $postarr );
+		$data = apply_filters( 'wp_insert_attachment_data', $data, $postarr, $unsanitized_postarr );
 	} else {
 		/**
 		 * Filters slashed post data just before it is inserted into the database.
 		 *
 		 * @since 2.7.0
+		 * @since 5.4.1 `$unsanitized_postarr` argument added.
 		 *
-		 * @param array $data    An array of slashed post data.
+		 * @param array $data                An array of slashed, sanitized, and processed post data.
-		 * @param array $postarr An array of sanitized, but otherwise unmodified post data.
+		 * @param array $postarr             An array of sanitized (and slashed) but otherwise unmodified post data.
+		 * @param array $unsanitized_postarr An array of slashed yet *unsanitized* and unprocessed post data as
+		 *                                   originally passed to wp_insert_post().
 		 */
-		$data = apply_filters( 'wp_insert_post_data', $data, $postarr );
+		$data = apply_filters( 'wp_insert_post_data', $data, $postarr, $unsanitized_postarr );
 	}
 	$data  = wp_unslash( $data );
 	$where = array( 'ID' => $post_ID );
 	if ( $update ) {
 		/**
 		 *
 		 * @param int   $post_ID Post ID.
 		 * @param array $data    Array of unslashed post data.
 		 */
 		do_action( 'pre_post_update', $post_ID, $data );
 		if ( false === $wpdb->update( $wpdb->posts, $data, $where ) ) {
 			if ( $wp_error ) {
-				return new WP_Error( 'db_update_error', __( 'Could not update post in the database' ), $wpdb->last_error );
+				if ( 'attachment' === $post_type ) {
+					$message = __( 'Could not update attachment in the database.' );
+				} else {
+					$message = __( 'Could not update post in the database.' );
+				}
+				return new WP_Error( 'db_update_error', $message, $wpdb->last_error );
 			} else {
 				return 0;
 			}
 		}
 	} else {
 		// If there is a suggested ID, use it if not already present.
 		if ( ! empty( $import_id ) ) {
 			$import_id = (int) $import_id;
 			if ( ! $wpdb->get_var( $wpdb->prepare( "SELECT ID FROM $wpdb->posts WHERE ID = %d", $import_id ) ) ) {
 				$data['ID'] = $import_id;
 			}
 		}
 		if ( false === $wpdb->insert( $wpdb->posts, $data ) ) {
 			if ( $wp_error ) {
-				return new WP_Error( 'db_insert_error', __( 'Could not insert post into the database' ), $wpdb->last_error );
+				if ( 'attachment' === $post_type ) {
+					$message = __( 'Could not insert attachment into the database.' );
+				} else {
+					$message = __( 'Could not insert post into the database.' );
+				}
+				return new WP_Error( 'db_insert_error', $message, $wpdb->last_error );
 			} else {
 				return 0;
 			}
 		}
 		$post_ID = (int) $wpdb->insert_id;
 		// Use the newly generated $post_ID.
 		$where = array( 'ID' => $post_ID );
 	}
-	if ( empty( $data['post_name'] ) && ! in_array( $data['post_status'], array( 'draft', 'pending', 'auto-draft' ) ) ) {
+	if ( empty( $data['post_name'] ) && ! in_array( $data['post_status'], array( 'draft', 'pending', 'auto-draft' ), true ) ) {
 		$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 );
 	}
 	if ( isset( $postarr['tags_input'] ) && is_object_in_taxonomy( $post_type, 'post_tag' ) ) {
 		wp_set_post_tags( $post_ID, $postarr['tags_input'] );
+	}
+	// Add default term for all associated custom taxonomies.
+	if ( 'auto-draft' !== $post_status ) {
+		foreach ( get_object_taxonomies( $post_type, 'object' ) as $taxonomy => $tax_object ) {
+			if ( ! empty( $tax_object->default_term ) ) {
+				// Filter out empty terms.
+				if ( isset( $postarr['tax_input'] ) && is_array( $postarr['tax_input'][ $taxonomy ] ) ) {
+					$postarr['tax_input'][ $taxonomy ] = array_filter( $postarr['tax_input'][ $taxonomy ] );
+				}
+				// Passed custom taxonomy list overwrites the existing list if not empty.
+				$terms = wp_get_object_terms( $post_ID, $taxonomy, array( 'fields' => 'ids' ) );
+				if ( ! empty( $terms ) && empty( $postarr['tax_input'][ $taxonomy ] ) ) {
+					$postarr['tax_input'][ $taxonomy ] = $terms;
+				}
+				if ( empty( $postarr['tax_input'][ $taxonomy ] ) ) {
+					$default_term_id = get_option( 'default_term_' . $taxonomy );
+					if ( ! empty( $default_term_id ) ) {
+						$postarr['tax_input'][ $taxonomy ] = array( (int) $default_term_id );
+					}
+				}
+			}
+		}
 	}
 	// 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 */
+				/* 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 );
 			}
 		}
 	}
 	}
 	$current_guid = get_post_field( 'guid', $post_ID );
 	// Set GUID.
-	if ( ! $update && '' == $current_guid ) {
+	if ( ! $update && '' === $current_guid ) {
 		$wpdb->update( $wpdb->posts, array( 'guid' => get_permalink( $post_ID ) ), $where );
 	}
 	if ( 'attachment' === $postarr['post_type'] ) {
 		if ( ! empty( $postarr['file'] ) ) {
 	}
 	// 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' );
 	$post = get_post( $post_ID );
 	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 ( 'default' !== $postarr['page_template'] && ! isset( $page_templates[ $postarr['page_template'] ] ) ) {
 			if ( $wp_error ) {
 				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 3.7.0
 	 *
 	 * @param int     $post_ID Post ID.
 	 * @param WP_Post $post    Post object.
-	 * @param bool    $update  Whether this is an existing post being updated or not.
+	 * @param bool    $update  Whether this is an existing post being updated.
 	 */
 	do_action( "save_post_{$post->post_type}", $post_ID, $post, $update );
 	/**
 	 * Fires once a post has been saved.
 	 *
 	 * @since 1.5.0
 	 *
 	 * @param int     $post_ID Post ID.
 	 * @param WP_Post $post    Post object.
-	 * @param bool    $update  Whether this is an existing post being updated or not.
+	 * @param bool    $update  Whether this is an existing post being updated.
 	 */
 	do_action( 'save_post', $post_ID, $post, $update );
 	/**
 	 * Fires once a post has been saved.
 	 *
 	 * @since 2.0.0
 	 *
 	 * @param int     $post_ID Post ID.
 	 * @param WP_Post $post    Post object.
-	 * @param bool    $update  Whether this is an existing post being updated or not.
+	 * @param bool    $update  Whether this is an existing post being updated.
 	 */
 	do_action( 'wp_insert_post', $post_ID, $post, $update );
 	return $post_ID;
 }
 * @since 1.0.0
 *
 * @param array|object $postarr  Optional. Post data. Arrays are expected to be escaped,
 *                               objects are not. Default array.
 * @param bool         $wp_error Optional. Allow return of WP_Error on failure. Default false.
-* @return int|WP_Error The value 0 or WP_Error on failure. The post ID on success.
+* @return int|WP_Error The post ID on success. The value 0 or WP_Error on failure.
 */
 function wp_update_post( $postarr = array(), $wp_error = false ) {
 	if ( is_object( $postarr ) ) {
 		// Non-escaped post was passed.
 		$postarr = get_object_vars( $postarr );
 	// Escape data pulled from DB.
 	$post = wp_slash( $post );
 	// Passed post category list overwrites existing category list if not empty.
 	if ( isset( $postarr['post_category'] ) && is_array( $postarr['post_category'] )
-			&& 0 != count( $postarr['post_category'] ) ) {
+		&& count( $postarr['post_category'] ) > 0
+	) {
 		$post_cats = $postarr['post_category'];
 	} else {
 		$post_cats = $post['post_category'];
 	}
 	// Drafts shouldn't be assigned a date unless explicitly done so by the user.
-	if ( isset( $post['post_status'] ) && in_array( $post['post_status'], array( 'draft', 'pending', 'auto-draft' ) ) && empty( $postarr['edit_date'] ) &&
+	if ( isset( $post['post_status'] )
-			( '0000-00-00 00:00:00' == $post['post_date_gmt'] ) ) {
+		&& in_array( $post['post_status'], array( 'draft', 'pending', 'auto-draft' ), true )
+		&& empty( $postarr['edit_date'] ) && ( '0000-00-00 00:00:00' === $post['post_date_gmt'] )
+	) {
 		$clear_date = true;
 	} else {
 		$clear_date = false;
 	}
 	if ( $clear_date ) {
 		$postarr['post_date']     = current_time( 'mysql' );
 		$postarr['post_date_gmt'] = '';
 	}
-	if ( $postarr['post_type'] == 'attachment' ) {
+	if ( 'attachment' === $postarr['post_type'] ) {
 		return wp_insert_attachment( $postarr, false, 0, $wp_error );
+	}
+	// Discard 'tags_input' parameter if it's the same as existing post tags.
+	if ( isset( $postarr['tags_input'] ) && is_object_in_taxonomy( $postarr['post_type'], 'post_tag' ) ) {
+		$tags      = get_the_terms( $postarr['ID'], 'post_tag' );
+		$tag_names = array();
+		if ( $tags && ! is_wp_error( $tags ) ) {
+			$tag_names = wp_list_pluck( $tags, 'name' );
+		}
+		if ( $postarr['tags_input'] === $tag_names ) {
+			unset( $postarr['tags_input'] );
+		}
 	}
 	return wp_insert_post( $postarr, $wp_error );
 }
 * @param int|WP_Post $post Post ID or post object.
 */
 function wp_publish_post( $post ) {
 	global $wpdb;
-	if ( ! $post = get_post( $post ) ) {
+	$post = get_post( $post );
+	if ( ! $post ) {
 		return;
 	}
-	if ( 'publish' == $post->post_status ) {
+	if ( 'publish' === $post->post_status ) {
 		return;
 	}
 	$wpdb->update( $wpdb->posts, array( 'post_status' => 'publish' ), array( 'ID' => $post->ID ) );
 	if ( empty( $post ) ) {
 		return;
 	}
-	if ( 'future' != $post->post_status ) {
+	if ( 'future' !== $post->post_status ) {
 		return;
 	}
 	$time = strtotime( $post->post_date_gmt . ' GMT' );
 	// Uh oh, someone jumped the gun!
 	if ( $time > time() ) {
-		wp_clear_scheduled_hook( 'publish_future_post', array( $post_id ) ); // clear anything else in the system
+		wp_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;
 	}
 	// wp_publish_post() returns no meaningful value.
 /**
 * 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
+* @global WP_Rewrite $wp_rewrite WordPress rewrite component.
 *
 * @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 ) || 'user_request' === $post_type ) {
+	if ( in_array( $post_status, array( 'draft', 'pending', 'auto-draft' ), true )
+		|| ( 'inherit' === $post_status && 'revision' === $post_type ) || 'user_request' === $post_type
+	) {
 		return $slug;
 	}
 	/**
 	 * Filters the post slug before it is generated to be unique.
 	 * Returning a non-null value will short-circuit the
 	 * unique slug generation, returning the passed value instead.
 	 *
 	 * @since 5.1.0
 	 *
-	 * @param string $override_slug Short-circuit return value.
+	 * @param string|null $override_slug Short-circuit return value.
-	 * @param string $slug          The desired slug (post_name).
+	 * @param string      $slug          The desired slug (post_name).
-	 * @param int    $post_ID       Post ID.
+	 * @param int         $post_ID       Post ID.
-	 * @param string $post_status   The post status.
+	 * @param string      $post_status   The post status.
-	 * @param string $post_type     Post type.
+	 * @param string      $post_type     Post type.
-	 * @param int    $post_parent   Post parent ID.
+	 * @param int         $post_parent   Post parent ID.
 	 */
 	$override_slug = apply_filters( 'pre_wp_unique_post_slug', null, $slug, $post_ID, $post_status, $post_type, $post_parent );
 	if ( null !== $override_slug ) {
 		return $override_slug;
 	}
 	$feeds = $wp_rewrite->feeds;
 	if ( ! is_array( $feeds ) ) {
 		$feeds = array();
 	}
-	if ( 'attachment' == $post_type ) {
+	if ( 'attachment' === $post_type ) {
 		// Attachment slugs must be unique across all types.
 		$check_sql       = "SELECT post_name FROM $wpdb->posts WHERE post_name = %s AND ID != %d LIMIT 1";
 		$post_name_check = $wpdb->get_var( $wpdb->prepare( $check_sql, $slug, $post_ID ) );
 		/**
 		 * @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 ) || 'embed' === $slug || apply_filters( 'wp_unique_post_slug_is_bad_attachment_slug', false, $slug ) ) {
+		$is_bad_attachment_slug = apply_filters( 'wp_unique_post_slug_is_bad_attachment_slug', false, $slug );
+		if ( $post_name_check
+			|| in_array( $slug, $feeds, true ) || 'embed' === $slug
+			|| $is_bad_attachment_slug
+		) {
 			$suffix = 2;
 			do {
 				$alt_post_name   = _truncate_post_slug( $slug, 200 - ( strlen( $suffix ) + 1 ) ) . "-$suffix";
 				$post_name_check = $wpdb->get_var( $wpdb->prepare( $check_sql, $alt_post_name, $post_ID ) );
 				$suffix++;
 			} while ( $post_name_check );
 			$slug = $alt_post_name;
 		}
 	} elseif ( is_post_type_hierarchical( $post_type ) ) {
-		if ( 'nav_menu_item' == $post_type ) {
+		if ( 'nav_menu_item' === $post_type ) {
 			return $slug;
 		}
 		/*
 		 * Page slugs must be unique within their own trees. Pages are in a separate
 		 * @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 ) || '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 ) ) {
+		$is_bad_hierarchical_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, true ) || 'embed' === $slug
+			|| preg_match( "@^($wp_rewrite->pagination_base)?\d+$@", $slug )
+			|| $is_bad_hierarchical_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_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 ) );
+		$post = get_post( $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 ) ) {
+		if ( 'post' === $post_type && ( ! $post || $post->post_name !== $slug ) && preg_match( '/^[0-9]+$/', $slug ) ) {
-			$permastructs   = array_values( array_filter( explode( '/', get_option( 'permalink_structure' ) ) ) );
+			$slug_num = intval( $slug );
-			$postname_index = array_search( '%postname%', $permastructs );
+			if ( $slug_num ) {
-			/*
+				$permastructs   = array_values( array_filter( explode( '/', get_option( 'permalink_structure' ) ) ) );
-			 * Potential date clashes are as follows:
+				$postname_index = array_search( '%postname%', $permastructs, true );
-			 *
-			 * - Any integer in the first permastruct position could be a year.
+				/*
-			 * - An integer between 1 and 12 that follows 'year' conflicts with 'monthnum'.
+				* Potential date clashes are as follows:
-			 * - An integer between 1 and 31 that follows 'monthnum' conflicts with 'day'.
+				*
-			 */
+				* - Any integer in the first permastruct position could be a year.
-			if ( 0 === $postname_index ||
+				* - An integer between 1 and 12 that follows 'year' conflicts with 'monthnum'.
-				( $postname_index && '%year%' === $permastructs[ $postname_index - 1 ] && 13 > $slug_num ) ||
+				* - An integer between 1 and 31 that follows 'monthnum' conflicts with 'day'.
-				( $postname_index && '%monthnum%' === $permastructs[ $postname_index - 1 ] && 32 > $slug_num )
+				*/
-			) {
+				if ( 0 === $postname_index ||
-				$conflicts_with_date_archive = true;
+					( $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;
+				}
 			}
 		}
 		/**
 		 * Filters whether the post slug would be bad as a flat slug.
 		 *
 		 * @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 ) || 'embed' === $slug || $conflicts_with_date_archive || apply_filters( 'wp_unique_post_slug_is_bad_flat_slug', false, $slug, $post_type ) ) {
+		$is_bad_flat_slug = apply_filters( 'wp_unique_post_slug_is_bad_flat_slug', false, $slug, $post_type );
+		if ( $post_name_check
+			|| in_array( $slug, $feeds, true ) || 'embed' === $slug
+			|| $conflicts_with_date_archive
+			|| $is_bad_flat_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_type, $post_ID ) );
 				$suffix++;
 }
 /**
 * Set categories for a post.
 *
-* If the post categories parameter is not set, then the default category is
+* If no categories are provided, the default category is used.
-* going used.
 *
 * @since 2.1.0
 *
 * @param int       $post_ID         Optional. The Post ID. Does not default to the ID
 *                                   of the global $post. Default 0.
 */
 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 );
-	// If $post_categories isn't already an array, make it one:
+	// If $post_categories isn't already an array, make it one.
 	$post_categories = (array) $post_categories;
 	if ( empty( $post_categories ) ) {
-		if ( 'post' == $post_type && 'auto-draft' != $post_status ) {
+		/**
+		 * Filters post types (in addition to 'post') that require a default category.
+		 *
+		 * @since 5.5.0
+		 *
+		 * @param string[] $post_types An array of post type names. Default empty array.
+		 */
+		$default_category_post_types = apply_filters( 'default_category_post_types', array() );
+		// Regular posts always require a default category.
+		$default_category_post_types = array_merge( $default_category_post_types, array( 'post' ) );
+		if ( in_array( $post_type, $default_category_post_types, true )
+			&& is_object_in_taxonomy( $post_type, 'category' )
+			&& 'auto-draft' !== $post_status
+		) {
 			$post_categories = array( get_option( 'default_category' ) );
 			$append          = false;
 		} else {
 			$post_categories = array();
 		}
-	} elseif ( 1 == count( $post_categories ) && '' == reset( $post_categories ) ) {
+	} elseif ( 1 === count( $post_categories ) && '' === reset( $post_categories ) ) {
 		return true;
 	}
 	return wp_set_post_terms( $post_ID, $post_categories, 'category', $append );
 }
 * Retrieve enclosures already enclosed for a post.
 *
 * @since 1.5.0
 *
 * @param int $post_id Post ID.
-* @return array List of enclosures.
+* @return string[] Array of enclosures for the given post.
 */
 function get_enclosed( $post_id ) {
 	$custom_fields = get_post_custom( $post_id );
 	$pung          = array();
 	if ( ! is_array( $custom_fields ) ) {
 		return $pung;
 	}
 	foreach ( $custom_fields as $key => $val ) {
-		if ( 'enclosure' != $key || ! is_array( $val ) ) {
+		if ( 'enclosure' !== $key || ! is_array( $val ) ) {
 			continue;
 		}
 		foreach ( $val as $enc ) {
 			$enclosure = explode( "\n", $enc );
 			$pung[]    = trim( $enclosure[0] );
 	/**
 	 * 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 string[] $pung    Array of enclosures for the given post.
-	 * @param int   $post_id Post ID.
+	 * @param int      $post_id Post ID.
 	 */
 	return apply_filters( 'get_enclosed', $pung, $post_id );
 }
 /**
 *
 * @since 1.5.0
 * @since 4.7.0 `$post_id` can be a WP_Post object.
 *
 * @param int|WP_Post $post_id Post Object or ID
-* @return array
+* @return string[]|false List of URLs yet to ping.
 */
 function get_to_ping( $post_id ) {
 	$post = get_post( $post_id );
 	if ( ! $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.
+	 * @param string[] $to_ping List of URLs yet to ping.
 	 */
 	return apply_filters( 'get_to_ping', $to_ping );
 }
 /**
 		}
 	}
 }
 //
-// Page functions
+// Page functions.
 //
 /**
 * Get a list of page IDs.
 *
 * @since 2.0.0
 *
 * @global wpdb $wpdb WordPress database abstraction object.
 *
-* @return array List of page IDs.
+* @return string[] List of page IDs as strings.
 */
 function get_all_page_ids() {
 	global $wpdb;
 	$page_ids = wp_cache_get( 'all_page_ids', 'posts' );
 * Use get_post() instead of get_page().
 *
 * @since 1.5.1
 * @deprecated 3.5.0 Use get_post()
 *
-* @param mixed  $page   Page object or page ID. Passed by reference.
+* @param int|WP_Post $page   Page object or page ID. Passed by reference.
-* @param string $output Optional. The required return type. One of OBJECT, ARRAY_A, or ARRAY_N, which correspond to
+* @param string      $output Optional. The required return type. One of OBJECT, ARRAY_A, or ARRAY_N, which
-*                       a WP_Post object, an associative array, or a numeric array, respectively. Default OBJECT.
+*                            correspond to a WP_Post object, an associative array, or a numeric array,
-* @param string $filter Optional. How the return value should be filtered. Accepts 'raw',
+*                            respectively. Default OBJECT.
-*                       'edit', 'db', 'display'. Default 'raw'.
+* @param string      $filter Optional. How the return value should be filtered. Accepts 'raw',
-* @return WP_Post|array|null WP_Post (or array) on success, or null on failure.
+*                            'edit', 'db', 'display'. Default 'raw'.
+* @return WP_Post|array|null WP_Post or array on success, 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. The required return type. One of OBJECT, ARRAY_A, or ARRAY_N, which correspond to
+* @param string       $output    Optional. The required return type. One of OBJECT, ARRAY_A, or ARRAY_N, which
-*                                a WP_Post object, an associative array, or a numeric array, respectively. Default OBJECT.
+*                                correspond to 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|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;
 			/*
 			 * 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 ] ) ) {
+			while ( 0 != $p->post_parent && isset( $pages[ $p->post_parent ] ) ) {
 				$count++;
 				$parent = $pages[ $p->post_parent ];
 				if ( ! isset( $revparts[ $count ] ) || $parent->post_name != $revparts[ $count ] ) {
 					break;
 				}
 				$p = $parent;
 			}
-			if ( $p->post_parent == 0 && $count + 1 == count( $revparts ) && $p->post_name == $revparts[ $count ] ) {
+			if ( 0 == $p->post_parent && count( $revparts ) == $count + 1 && $p->post_name == $revparts[ $count ] ) {
 				$foundid = $page->ID;
 				if ( $page->post_type == $post_type ) {
 					break;
 				}
 			}
 }
 /**
 * Retrieve a page given its title.
 *
+* If more than one post uses the same title, the post with the smallest ID will be returned.
+* Be careful: in case of more than one post having the same title, it will check the oldest
+* publication date, not the smallest ID.
+*
+* Because this function uses the MySQL '=' comparison, $page_title will usually be matched
+* as case-insensitive with default collation.
+*
 * @since 2.1.0
+* @since 3.0.0 The `$post_type` parameter was added.
 *
 * @global wpdb $wpdb WordPress database abstraction object.
 *
-* @param string       $page_title Page title
+* @param string       $page_title Page title.
-* @param string       $output     Optional. The required return type. One of OBJECT, ARRAY_A, or ARRAY_N, which correspond to
+* @param string       $output     Optional. The required return type. One of OBJECT, ARRAY_A, or ARRAY_N, which
-*                                 a WP_Post object, an associative array, or a numeric array, respectively. Default OBJECT.
+*                                 correspond to 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|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;
 * 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 WP_Post[] $pages   Posts array (passed by reference).
-* @param int   $page_id Optional. Parent page ID. Default 0.
+* @param int       $page_id Optional. Parent page ID. Default 0.
-* @return array A list arranged by hierarchy. Children immediately follow their parents.
+* @return string[] Array of post names keyed by ID and arranged by hierarchy. Children immediately follow their parents.
 */
 function get_page_hierarchy( &$pages, $page_id = 0 ) {
 	if ( empty( $pages ) ) {
 		return array();
 	}
 * @since 2.9.0
 * @access private
 *
 * @see _page_traverse_name()
 *
-* @param int   $page_id   Page ID.
+* @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 string[] $result   Array of page names keyed by ID (passed by reference).
 */
 function _page_traverse_name( $page_id, &$children, &$result ) {
 	if ( isset( $children[ $page_id ] ) ) {
 		foreach ( (array) $children[ $page_id ] as $child ) {
 			$result[ $child->ID ] = $child->post_name;
 * Build the URI path for a page.
 *
 * Sub pages will be in the "directory" under the parent page post name.
 *
 * @since 1.5.0
-* @since 4.6.0 Converted the `$page` parameter to optional.
+* @since 4.6.0 The `$page` parameter was made optional.
 *
 * @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 = 0 ) {
 		'offset'       => 0,
 		'post_type'    => 'page',
 		'post_status'  => 'publish',
 	);
-	$r = wp_parse_args( $args, $defaults );
+	$parsed_args = wp_parse_args( $args, $defaults );
-	$number       = (int) $r['number'];
+	$number       = (int) $parsed_args['number'];
-	$offset       = (int) $r['offset'];
+	$offset       = (int) $parsed_args['offset'];
-	$child_of     = (int) $r['child_of'];
+	$child_of     = (int) $parsed_args['child_of'];
-	$hierarchical = $r['hierarchical'];
+	$hierarchical = $parsed_args['hierarchical'];
-	$exclude      = $r['exclude'];
+	$exclude      = $parsed_args['exclude'];
-	$meta_key     = $r['meta_key'];
+	$meta_key     = $parsed_args['meta_key'];
-	$meta_value   = $r['meta_value'];
+	$meta_value   = $parsed_args['meta_value'];
-	$parent       = $r['parent'];
+	$parent       = $parsed_args['parent'];
-	$post_status  = $r['post_status'];
+	$post_status  = $parsed_args['post_status'];
 	// Make sure the post type is hierarchical.
 	$hierarchical_post_types = get_post_types( array( 'hierarchical' => true ) );
-	if ( ! in_array( $r['post_type'], $hierarchical_post_types ) ) {
+	if ( ! in_array( $parsed_args['post_type'], $hierarchical_post_types, true ) ) {
 		return false;
 	}
 	if ( $parent > 0 && ! $child_of ) {
 		$hierarchical = false;
 	if ( array_diff( $post_status, get_post_stati() ) ) {
 		return false;
 	}
 	// $args can be whatever, only use the args defined in defaults to compute the key.
-	$key          = md5( serialize( wp_array_slice_assoc( $r, array_keys( $defaults ) ) ) );
+	$key          = md5( serialize( wp_array_slice_assoc( $parsed_args, array_keys( $defaults ) ) ) );
 	$last_changed = wp_cache_get_last_changed( 'posts' );
 	$cache_key = "get_pages:$key:$last_changed";
 	$cache     = wp_cache_get( $cache_key, 'posts' );
 	if ( false !== $cache ) {
 		// Convert to WP_Post instances.
 		$pages = array_map( 'get_post', $cache );
 		/** This filter is documented in wp-includes/post.php */
-		$pages = apply_filters( 'get_pages', $pages, $r );
+		$pages = apply_filters( 'get_pages', $pages, $parsed_args );
 		return $pages;
 	}
 	$inclusions = '';
-	if ( ! empty( $r['include'] ) ) {
+	if ( ! empty( $parsed_args['include'] ) ) {
-		$child_of     = 0; //ignore child_of, parent, exclude, meta_key, and meta_value params if using include
+		$child_of     = 0; // Ignore child_of, parent, exclude, meta_key, and meta_value params if using include.
 		$parent       = -1;
 		$exclude      = '';
 		$meta_key     = '';
 		$meta_value   = '';
 		$hierarchical = false;
-		$incpages     = wp_parse_id_list( $r['include'] );
+		$incpages     = wp_parse_id_list( $parsed_args['include'] );
 		if ( ! empty( $incpages ) ) {
 			$inclusions = ' AND ID IN (' . implode( ',', $incpages ) . ')';
 		}
 	}
 			$exclusions = ' AND ID NOT IN (' . implode( ',', $expages ) . ')';
 		}
 	}
 	$author_query = '';
-	if ( ! empty( $r['authors'] ) ) {
+	if ( ! empty( $parsed_args['authors'] ) ) {
-		$post_authors = wp_parse_list( $r['authors'] );
+		$post_authors = wp_parse_list( $parsed_args['authors'] );
 		if ( ! empty( $post_authors ) ) {
 			foreach ( $post_authors as $post_author ) {
-				//Do we have an author id or an author login?
+				// Do we have an author id or an author login?
 				if ( 0 == intval( $post_author ) ) {
 					$post_author = get_user_by( 'login', $post_author );
 					if ( empty( $post_author ) ) {
 						continue;
 					}
 						continue;
 					}
 					$post_author = $post_author->ID;
 				}
-				if ( '' == $author_query ) {
+				if ( '' === $author_query ) {
 					$author_query = $wpdb->prepare( ' post_author = %d ', $post_author );
 				} else {
 					$author_query .= $wpdb->prepare( ' OR post_author = %d ', $post_author );
 				}
 			}
-			if ( '' != $author_query ) {
+			if ( '' !== $author_query ) {
 				$author_query = " AND ($author_query)";
 			}
 		}
 	}
 	$join  = '';
 	$where = "$exclusions $inclusions ";
 	if ( '' !== $meta_key || '' !== $meta_value ) {
 		$join = " LEFT JOIN $wpdb->postmeta ON ( $wpdb->posts.ID = $wpdb->postmeta.post_id )";
-		// meta_key and meta_value might be slashed
+		// meta_key and meta_value might be slashed.
 		$meta_key   = wp_unslash( $meta_key );
 		$meta_value = wp_unslash( $meta_value );
 		if ( '' !== $meta_key ) {
 			$where .= $wpdb->prepare( " AND $wpdb->postmeta.meta_key = %s", $meta_key );
 		}
 		}
 	} elseif ( $parent >= 0 ) {
 		$where .= $wpdb->prepare( ' AND post_parent = %d ', $parent );
 	}
-	if ( 1 == count( $post_status ) ) {
+	if ( 1 === count( $post_status ) ) {
-		$where_post_type = $wpdb->prepare( 'post_type = %s AND post_status = %s', $r['post_type'], reset( $post_status ) );
+		$where_post_type = $wpdb->prepare( 'post_type = %s AND post_status = %s', $parsed_args['post_type'], reset( $post_status ) );
 	} else {
 		$post_status     = implode( "', '", $post_status );
-		$where_post_type = $wpdb->prepare( "post_type = %s AND post_status IN ('$post_status')", $r['post_type'] );
+		$where_post_type = $wpdb->prepare( "post_type = %s AND post_status IN ('$post_status')", $parsed_args['post_type'] );
 	}
 	$orderby_array = array();
 	$allowed_keys  = array(
 		'author',
 		'ID',
 		'rand',
 		'comment_count',
 	);
-	foreach ( explode( ',', $r['sort_column'] ) as $orderby ) {
+	foreach ( explode( ',', $parsed_args['sort_column'] ) as $orderby ) {
 		$orderby = trim( $orderby );
-		if ( ! in_array( $orderby, $allowed_keys ) ) {
+		if ( ! in_array( $orderby, $allowed_keys, true ) ) {
 			continue;
 		}
 		switch ( $orderby ) {
 			case 'menu_order':
 		$orderby_array[] = $orderby;
 	}
 	$sort_column = ! empty( $orderby_array ) ? implode( ',', $orderby_array ) : "$wpdb->posts.post_title";
-	$sort_order = strtoupper( $r['sort_order'] );
+	$sort_order = strtoupper( $parsed_args['sort_order'] );
-	if ( '' !== $sort_order && ! in_array( $sort_order, array( 'ASC', 'DESC' ) ) ) {
+	if ( '' !== $sort_order && ! in_array( $sort_order, array( 'ASC', 'DESC' ), true ) ) {
 		$sort_order = 'ASC';
 	}
 	$query  = "SELECT * FROM $wpdb->posts $join WHERE ($where_post_type) $where ";
 	$query .= $author_query;
 	if ( empty( $pages ) ) {
 		wp_cache_set( $cache_key, array(), 'posts' );
 		/** This filter is documented in wp-includes/post.php */
-		$pages = apply_filters( 'get_pages', array(), $r );
+		$pages = apply_filters( 'get_pages', array(), $parsed_args );
 		return $pages;
 	}
 	// Sanitize before caching so it'll only get done once.
 	$num_pages = count( $pages );
 	if ( $child_of || $hierarchical ) {
 		$pages = get_page_children( $child_of, $pages );
 	}
-	if ( ! empty( $r['exclude_tree'] ) ) {
+	if ( ! empty( $parsed_args['exclude_tree'] ) ) {
-		$exclude = wp_parse_id_list( $r['exclude_tree'] );
+		$exclude = wp_parse_id_list( $parsed_args['exclude_tree'] );
 		foreach ( $exclude as $id ) {
 			$children = get_page_children( $id, $pages );
 			foreach ( $children as $child ) {
 				$exclude[] = $child->ID;
 			}
 		}
 		$num_pages = count( $pages );
 		for ( $i = 0; $i < $num_pages; $i++ ) {
-			if ( in_array( $pages[ $i ]->ID, $exclude ) ) {
+			if ( in_array( $pages[ $i ]->ID, $exclude, true ) ) {
 				unset( $pages[ $i ] );
 			}
 		}
 	}
 		$page_structure[] = $page->ID;
 	}
 	wp_cache_set( $cache_key, $page_structure, 'posts' );
-	// Convert to WP_Post instances
+	// Convert to WP_Post instances.
 	$pages = array_map( 'get_post', $pages );
 	/**
 	 * Filters the retrieved list of pages.
 	 *
 	 * @since 2.1.0
 	 *
-	 * @param array $pages List of pages to retrieve.
+	 * @param WP_Post[] $pages       Array of page objects.
-	 * @param array $r     Array of get_pages() arguments.
+	 * @param array     $parsed_args Array of get_pages() arguments.
 	 */
-	return apply_filters( 'get_pages', $pages, $r );
+	return apply_filters( 'get_pages', $pages, $parsed_args );
 }
 //
-// Attachment functions
+// Attachment functions.
 //
 /**
 * Determines whether an attachment URI is local and really an attachment.
 *
 		return false;
 	}
 	if ( strpos( $url, home_url( '/?attachment_id=' ) ) !== false ) {
 		return true;
 	}
-	if ( $id = url_to_postid( $url ) ) {
+	$id = url_to_postid( $url );
+	if ( $id ) {
 		$post = get_post( $id );
-		if ( 'attachment' == $post->post_type ) {
+		if ( 'attachment' === $post->post_type ) {
 			return true;
 		}
 	}
 	return false;
 }
 *
 * When an attachment is permanently deleted, the file will also be removed.
 * Deletion removes all post meta fields, taxonomy, comments, etc. associated
 * with the attachment (except the main post).
 *
-* The attachment is moved to the trash instead of permanently deleted unless trash
+* The attachment is moved to the Trash instead of permanently deleted unless Trash
-* for media is disabled, item is already in the trash, or $force_delete is true.
+* for media is disabled, item is already in the Trash, or $force_delete is true.
 *
 * @since 2.0.0
 *
 * @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.
+* @param bool $force_delete Optional. Whether to bypass Trash and force deletion.
 *                           Default false.
 * @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;
 		return false;
 	}
 	if ( ! $force_delete && EMPTY_TRASH_DAYS && MEDIA_TRASH && 'trash' !== $post->post_status ) {
 		return wp_trash_post( $post_id );
+	}
+	/**
+	 * Filters whether an attachment deletion should take place.
+	 *
+	 * @since 5.5.0
+	 *
+	 * @param bool|null $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_attachment', null, $post, $force_delete );
+	if ( null !== $check ) {
+		return $check;
 	}
 	delete_post_meta( $post_id, '_wp_trash_meta_status' );
 	delete_post_meta( $post_id, '_wp_trash_meta_time' );
 	/**
 	 * Fires before an attachment is deleted, at the start of wp_delete_attachment().
 	 *
 	 * @since 2.0.0
-	 *
+	 * @since 5.5.0 Added the `$post` parameter.
-	 * @param int $post_id Attachment ID.
+	 *
+	 * @param int     $post_id Attachment ID.
+	 * @param WP_Post $post    Post object.
 	 */
-	do_action( 'delete_attachment', $post_id );
+	do_action( 'delete_attachment', $post_id, $post );
 	wp_delete_object_term_relationships( $post_id, array( 'category', 'post_tag' ) );
 	wp_delete_object_term_relationships( $post_id, get_object_taxonomies( $post->post_type ) );
 	// Delete all for any posts.
 	foreach ( $post_meta_ids as $mid ) {
 		delete_metadata_by_mid( 'post', $mid );
 	}
 	/** This action is documented in wp-includes/post.php */
-	do_action( 'delete_post', $post_id );
+	do_action( 'delete_post', $post_id, $post );
 	$result = $wpdb->delete( $wpdb->posts, array( 'ID' => $post_id ) );
 	if ( ! $result ) {
 		return false;
 	}
 	/** This action is documented in wp-includes/post.php */
-	do_action( 'deleted_post', $post_id );
+	do_action( 'deleted_post', $post_id, $post );
 	wp_delete_attachment_files( $post_id, $meta, $backup_sizes, $file );
 	clean_post_cache( $post );
 	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 ) ) ) {
 			$thumbfile = str_replace( wp_basename( $file ), $meta['thumb'], $file );
 			if ( ! empty( $thumbfile ) ) {
 				$thumbfile = path_join( $uploadpath['basedir'], $thumbfile );
 				$thumbdir  = path_join( $uploadpath['basedir'], dirname( $file ) );
 				if ( ! wp_delete_file_from_directory( $thumbfile, $thumbdir ) ) {
 	}
 	// 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( wp_basename( $file ), $sizeinfo['file'], $file );
 			if ( ! empty( $intermediate_file ) ) {
 				$intermediate_file = path_join( $uploadpath['basedir'], $intermediate_file );
 				if ( ! wp_delete_file_from_directory( $intermediate_file, $intermediate_dir ) ) {
 					$deleted = false;
 				}
 			}
 		}
 	}
+	if ( ! empty( $meta['original_image'] ) ) {
+		if ( empty( $intermediate_dir ) ) {
+			$intermediate_dir = path_join( $uploadpath['basedir'], dirname( $file ) );
+		}
+		$original_image = str_replace( wp_basename( $file ), $meta['original_image'], $file );
+		if ( ! empty( $original_image ) ) {
+			$original_image = path_join( $uploadpath['basedir'], $original_image );
+			if ( ! wp_delete_file_from_directory( $original_image, $intermediate_dir ) ) {
+				$deleted = false;
+			}
+		}
+	}
 	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'] );
 			if ( ! empty( $del_file ) ) {
 				$del_file = path_join( $uploadpath['basedir'], $del_file );
 				if ( ! wp_delete_file_from_directory( $del_file, $del_dir ) ) {
 					$deleted = false;
 	return $deleted;
 }
 /**
-* Retrieve attachment meta field for attachment ID.
+* Retrieves attachment metadata for attachment ID.
 *
 * @since 2.1.0
 *
 * @param int  $attachment_id Attachment post ID. Defaults to global $post.
 * @param bool $unfiltered    Optional. If true, filters are not run. Default false.
-* @return mixed Attachment meta field. False on failure.
+* @return array|false {
+*     Attachment metadata. False on failure.
+*
+*     @type int    $width      The width of the attachment.
+*     @type int    $height     The height of the attachment.
+*     @type string $file       The file path relative to `wp-content/uploads`.
+*     @type array  $sizes      Keys are size slugs, each value is an array containing
+*                              'file', 'width', 'height', and 'mime-type'.
+*     @type array  $image_meta Image metadata.
+* }
 */
 function wp_get_attachment_metadata( $attachment_id = 0, $unfiltered = false ) {
 	$attachment_id = (int) $attachment_id;
-	if ( ! $post = get_post( $attachment_id ) ) {
+	$post = get_post( $attachment_id );
+	if ( ! $post ) {
 		return false;
 	}
 	$data = get_post_meta( $post->ID, '_wp_attachment_metadata', true );
 	 */
 	return apply_filters( 'wp_get_attachment_metadata', $data, $post->ID );
 }
 /**
-* Update metadata for an attachment.
+* Updates metadata for an attachment.
 *
 * @since 2.1.0
 *
 * @param int   $attachment_id Attachment post ID.
 * @param array $data          Attachment meta data.
 * @return int|bool False if $post is invalid.
 */
 function wp_update_attachment_metadata( $attachment_id, $data ) {
 	$attachment_id = (int) $attachment_id;
-	if ( ! $post = get_post( $attachment_id ) ) {
+	$post = get_post( $attachment_id );
+	if ( ! $post ) {
 		return false;
 	}
 	/**
 	 * Filters the updated attachment meta data.
 	 * @since 2.1.0
 	 *
 	 * @param array $data          Array of updated attachment meta data.
 	 * @param int   $attachment_id Attachment post ID.
 	 */
-	if ( $data = apply_filters( 'wp_update_attachment_metadata', $data, $post->ID ) ) {
+	$data = apply_filters( 'wp_update_attachment_metadata', $data, $post->ID );
+	if ( $data ) {
 		return update_post_meta( $post->ID, '_wp_attachment_metadata', $data );
 	} else {
 		return delete_post_meta( $post->ID, '_wp_attachment_metadata' );
 	}
 }
 * @param int $attachment_id Optional. Attachment post ID. Defaults to global $post.
 * @return string|false Attachment URL, otherwise false.
 */
 function wp_get_attachment_url( $attachment_id = 0 ) {
 	$attachment_id = (int) $attachment_id;
-	if ( ! $post = get_post( $attachment_id ) ) {
+	$post = get_post( $attachment_id );
+	if ( ! $post ) {
 		return false;
 	}
-	if ( 'attachment' != $post->post_type ) {
+	if ( 'attachment' !== $post->post_type ) {
 		return false;
 	}
 	$url = '';
 	// Get attached file.
-	if ( $file = get_post_meta( $post->ID, '_wp_attached_file', true ) ) {
+	$file = get_post_meta( $post->ID, '_wp_attached_file', true );
+	if ( $file ) {
 		// Get upload directory.
-		if ( ( $uploads = wp_get_upload_dir() ) && false === $uploads['error'] ) {
+		$uploads = wp_get_upload_dir();
+		if ( $uploads && 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' ) ) {
-				// Get the directory name relative to the basedir (back compat for pre-2.7 uploads)
+				// 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 ) ) . wp_basename( $file );
 			} else {
 				// It's a newly-uploaded file, therefore $file is relative to the basedir.
 				$url = $uploads['baseurl'] . "/$file";
 			}
 * @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 ) ) {
+	$post    = get_post( $post_id );
+	if ( ! $post ) {
 		return false;
 	}
 	if ( 'attachment' !== $post->post_type ) {
 		return false;
 * @param int $post_id Optional. Attachment ID. Default 0.
 * @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 ) ) {
+	$post    = get_post( $post_id );
+	if ( ! $post ) {
 		return false;
 	}
-	if ( ! is_array( $imagedata = wp_get_attachment_metadata( $post->ID ) ) ) {
+	$imagedata = wp_get_attachment_metadata( $post->ID );
+	if ( ! is_array( $imagedata ) ) {
 		return false;
 	}
 	$file = get_attached_file( $post->ID );
-	if ( ! empty( $imagedata['thumb'] ) && ( $thumbfile = str_replace( wp_basename( $file ), $imagedata['thumb'], $file ) ) && file_exists( $thumbfile ) ) {
+	if ( ! empty( $imagedata['thumb'] ) ) {
-		/**
+		$thumbfile = str_replace( wp_basename( $file ), $imagedata['thumb'], $file );
-		 * Filters the attachment thumbnail file path.
+		if ( file_exists( $thumbfile ) ) {
-		 *
+			/**
-		 * @since 2.1.0
+			 * Filters the attachment thumbnail file path.
-		 *
+			 *
-		 * @param string $thumbfile File path to the attachment thumbnail.
+			 * @since 2.1.0
-		 * @param int    $post_id   Attachment ID.
+			 *
-		 */
+			 * @param string $thumbfile File path to the attachment thumbnail.
-		return apply_filters( 'wp_get_attachment_thumb_file', $thumbfile, $post->ID );
+			 * @param int    $post_id   Attachment ID.
+			 */
+			return apply_filters( 'wp_get_attachment_thumb_file', $thumbfile, $post->ID );
+		}
 	}
 	return false;
 }
 /**
 * @param int $post_id Optional. Attachment ID. Default 0.
 * @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 ) ) {
+	$post    = get_post( $post_id );
+	if ( ! $post ) {
 		return false;
 	}
-	if ( ! $url = wp_get_attachment_url( $post->ID ) ) {
+	$url = wp_get_attachment_url( $post->ID );
+	if ( ! $url ) {
 		return false;
 	}
 	$sized = image_downsize( $post_id, 'thumbnail' );
 	if ( $sized ) {
 		return $sized[0];
 	}
-	if ( ! $thumb = wp_get_attachment_thumb_file( $post->ID ) ) {
+	$thumb = wp_get_attachment_thumb_file( $post->ID );
+	if ( ! $thumb ) {
 		return false;
 	}
 	$url = str_replace( wp_basename( $url ), wp_basename( $thumb ), $url );
 * @param string      $type Attachment type. Accepts 'image', 'audio', or 'video'.
 * @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 = null ) {
-	if ( ! $post = get_post( $post ) ) {
+	$post = get_post( $post );
+	if ( ! $post ) {
 		return false;
 	}
-	if ( ! $file = get_attached_file( $post->ID ) ) {
+	$file = get_attached_file( $post->ID );
+	if ( ! $file ) {
 		return false;
 	}
 	if ( 0 === strpos( $post->post_mime_type, $type . '/' ) ) {
 		return true;
 	}
 	switch ( $type ) {
 		case 'image':
 			$image_exts = array( 'jpg', 'jpeg', 'jpe', 'gif', 'png' );
-			return in_array( $ext, $image_exts );
+			return in_array( $ext, $image_exts, true );
 		case 'audio':
-			return in_array( $ext, wp_get_audio_extensions() );
+			return in_array( $ext, wp_get_audio_extensions(), true );
 		case 'video':
-			return in_array( $ext, wp_get_video_extensions() );
+			return in_array( $ext, wp_get_video_extensions(), true );
 		default:
 			return $type === $ext;
 	}
 }
 function wp_attachment_is_image( $post = null ) {
 	return wp_attachment_is( 'image', $post );
 }
 /**
-* Retrieve the icon for a MIME type.
+* Retrieve the icon for a MIME type or attachment.
 *
 * @since 2.1.0
 *
 * @param string|int $mime MIME type or attachment ID.
 * @return string|false Icon, false otherwise.
 	$post_id = 0;
 	if ( empty( $icon ) ) {
 		$post_mimes = array();
 		if ( is_numeric( $mime ) ) {
 			$mime = (int) $mime;
-			if ( $post = get_post( $mime ) ) {
+			$post = get_post( $mime );
+			if ( $post ) {
 				$post_id = (int) $post->ID;
 				$file    = get_attached_file( $post_id );
 				$ext     = preg_replace( '/^.+?\.([^.]+)$/', '$1', $file );
 				if ( ! empty( $ext ) ) {
 					$post_mimes[] = $ext;
-					if ( $ext_type = wp_ext2type( $ext ) ) {
+					$ext_type     = wp_ext2type( $ext );
+					if ( $ext_type ) {
 						$post_mimes[] = $ext_type;
 					}
 				}
 				$mime = $post->post_mime_type;
 			} else {
 			 * @param string $uri Icon directory URI.
 			 */
 			$icon_dir_uri = apply_filters( 'icon_dir_uri', includes_url( 'images/media' ) );
 			/**
-			 * Filters the list of icon directory URIs.
+			 * Filters the array of icon directory URIs.
 			 *
 			 * @since 2.5.0
 			 *
-			 * @param array $uris List of icon directory URIs.
+			 * @param string[] $uris Array of icon directory URIs keyed by directory absolute path.
 			 */
 			$dirs       = apply_filters( 'icon_dirs', array( $icon_dir => $icon_dir_uri ) );
 			$icon_files = array();
 			while ( $dirs ) {
 				$keys = array_keys( $dirs );
 				$dir  = array_shift( $keys );
 				$uri  = array_shift( $dirs );
-				if ( $dh = opendir( $dir ) ) {
+				$dh   = opendir( $dir );
+				if ( $dh ) {
 					while ( false !== $file = readdir( $dh ) ) {
 						$file = wp_basename( $file );
-						if ( substr( $file, 0, 1 ) == '.' ) {
+						if ( '.' === substr( $file, 0, 1 ) ) {
 							continue;
 						}
-						if ( ! in_array( strtolower( substr( $file, -4 ) ), array( '.png', '.gif', '.jpg' ) ) ) {
+						$ext = strtolower( substr( $file, -4 ) );
+						if ( ! in_array( $ext, array( '.png', '.gif', '.jpg' ), true ) ) {
 							if ( is_dir( "$dir/$file" ) ) {
 								$dirs[ "$dir/$file" ] = "$uri/$file";
 							}
 							continue;
 						}
 	}
 	$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, true ) ) {
 		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, true ) ) {
 		delete_post_meta( $post_id, '_wp_old_slug', $post->post_name );
 	}
 }
 /**
 * @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 ) );
+	$previous_date = gmdate( 'Y-m-d', strtotime( $post_before->post_date ) );
-	$new_date      = date( 'Y-m-d', strtotime( $post->post_date ) );
+	$new_date      = gmdate( '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 ) ) {
+	if ( ! empty( $previous_date ) && ! in_array( $previous_date, $old_dates, true ) ) {
 		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 ) ) {
+	if ( in_array( $new_date, $old_dates, true ) ) {
 		delete_post_meta( $post_id, '_wp_old_date', $new_date );
 	}
 }
 /**
 * @since 4.3.0 Introduced the ability to pass an array of post types to `$post_type`.
 *
 * @see get_private_posts_cap_sql()
 * @global wpdb $wpdb WordPress database abstraction object.
 *
-* @param array|string   $post_type   Single post type or an array of post types.
+* @param string|string[] $post_type   Single post type or an array of post types.
-* @param bool           $full        Optional. Returns a full WHERE statement instead of just
+* @param bool            $full        Optional. Returns a full WHERE statement instead of just
-*                                    an 'andalso' term. Default true.
+*                                     an 'andalso' term. Default true.
-* @param int            $post_author Optional. Query posts having a single author ID. Default null.
+* @param int             $post_author Optional. Query posts having a single author ID. Default null.
-* @param bool           $public_only Optional. Only return public posts. Skips cap checks for
+* @param bool            $public_only Optional. Only return public posts. Skips cap checks for
-*                                    $current_user.  Default false.
+*                                     $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;
 		 * @since 2.2.0
 		 * @deprecated 3.2.0 The hook transitioned from "somewhat useless" to "totally useless".
 		 *
 		 * @param string $cap Capability.
 		 */
-		if ( ! $cap = apply_filters( 'pub_priv_sql_capability', '' ) ) {
+		$cap = apply_filters_deprecated( 'pub_priv_sql_capability', array( '' ), '3.2.0' );
+		if ( ! $cap ) {
 			$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'";
 				$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.
-			} // else none
+			} // Else none.
 		}
 		$post_type_clauses[] = "( post_type = '" . $post_type . "' AND ( $post_status_sql ) )";
 	}
 	return $sql;
 }
 /**
-* Retrieve the date that the last post was published.
+* Retrieves the most recent time that a post on the site was published.
 *
 * The server timezone is the default and is the difference between GMT and
-* server time. The 'blog' value is the date when the last post was posted. The
+* server time. The 'blog' value is the date when the last post was posted.
-* 'gmt' is when the last post was posted in GMT formatted date.
+* The 'gmt' is when the last post was posted in GMT formatted date.
 *
 * @since 0.71
 * @since 4.4.0 The `$post_type` argument was added.
 *
 * @param string $timezone  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.
+*                          'blog' uses the `post_date` field, which proxies to the timezone set for the site.
-*                          'gmt' uses the `post_modified_gmt` field.
+*                          'gmt' uses the `post_date_gmt` field.
 *                          Default 'server'.
 * @param string $post_type Optional. The post type to check. Default 'any'.
-* @return string The date of the last post.
+* @return string The date of the last post, or false on failure.
 */
 function get_lastpostdate( $timezone = 'server', $post_type = 'any' ) {
+	$lastpostdate = _get_last_post_time( $timezone, 'date', $post_type );
 	/**
-	 * Filters the date the last post was published.
+	 * Filters the most recent time that a post on the site was published.
 	 *
 	 * @since 2.3.0
-	 *
+	 * @since 5.5.0 Added the `$post_type` parameter.
-	 * @param string $date     Date the last post was published.
+	 *
-	 * @param string $timezone Location to use for getting the post published date.
+	 * @param string|false $lastpostdate The most recent time that a post was published,
-	 *                         See get_lastpostdate() for accepted `$timezone` values.
+	 *                                   in 'Y-m-d H:i:s' format. False on failure.
+	 * @param string       $timezone     Location to use for getting the post published date.
+	 *                                   See get_lastpostdate() for accepted `$timezone` values.
+	 * @param string       $post_type    The post type to check.
 	 */
-	return apply_filters( 'get_lastpostdate', _get_last_post_time( $timezone, 'date', $post_type ), $timezone );
+	return apply_filters( 'get_lastpostdate', $lastpostdate, $timezone, $post_type );
 }
 /**
-* Get the timestamp of the last time any post was modified.
+* Get the most recent time that a post on the site was modified.
 *
 * The server timezone is the default and is the difference between GMT and
-* server time. The 'blog' value is just when the last post was modified. The
+* server time. The 'blog' value is just when the last post was modified.
-* 'gmt' is when the last post was modified in GMT time.
+* The 'gmt' is when the last post was modified in GMT time.
 *
 * @since 1.2.0
 * @since 4.4.0 The `$post_type` argument was added.
 *
 * @param string $timezone  Optional. The timezone for the timestamp. See get_lastpostdate()
 *                          for information on accepted values.
 *                          Default 'server'.
 * @param string $post_type Optional. The post type to check. Default 'any'.
-* @return string The timestamp.
+* @return string The timestamp in 'Y-m-d H:i:s' format, or false on failure.
 */
 function get_lastpostmodified( $timezone = 'server', $post_type = 'any' ) {
 	/**
 	 * 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.
+	 * @param string|false $lastpostmodified The most recent time that a post was modified,
-	 *                                 Returning anything other than false will short-circuit the function.
+	 *                                       in 'Y-m-d H:i:s' format, or false. Returning anything
-	 * @param string $timezone         Location to use for getting the post modified date.
+	 *                                       other than false will short-circuit the function.
-	 *                                 See get_lastpostdate() for accepted `$timezone` values.
+	 * @param string       $timezone         Location to use for getting the post modified date.
-	 * @param string $post_type        The post type to check.
+	 *                                       See get_lastpostdate() for accepted `$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, $post_type );
-	$lastpostdate = get_lastpostdate( $timezone );
 	if ( $lastpostdate > $lastpostmodified ) {
 		$lastpostmodified = $lastpostdate;
 	}
 	/**
-	 * Filters the date the last post was modified.
+	 * Filters the most recent time that a post on the site was modified.
 	 *
 	 * @since 2.3.0
-	 *
+	 * @since 5.5.0 Added the `$post_type` parameter.
-	 * @param string $lastpostmodified Date the last post was modified.
+	 *
-	 * @param string $timezone         Location to use for getting the post modified date.
+	 * @param string|false $lastpostmodified The most recent time that a post was modified,
-	 *                                 See get_lastpostdate() for accepted `$timezone` values.
+	 *                                       in 'Y-m-d H:i:s' format. False on failure.
+	 * @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.
 	 */
-	return apply_filters( 'get_lastpostmodified', $lastpostmodified, $timezone );
+	return apply_filters( 'get_lastpostmodified', $lastpostmodified, $timezone, $post_type );
 }
 /**
-* Get the timestamp of the last time any post was modified or published.
+* Gets the timestamp of the last time any post was modified or published.
 *
 * @since 3.1.0
 * @since 4.4.0 The `$post_type` argument was added.
 * @access private
 *
 *
 * @param string $timezone  The timezone for the timestamp. See get_lastpostdate().
 *                          for information on accepted values.
 * @param string $field     Post field to check. Accepts 'date' or 'modified'.
 * @param string $post_type Optional. The post type to check. Default 'any'.
-* @return string|false The timestamp.
+* @return string|false The timestamp in 'Y-m-d H:i:s' format, or false on failure.
 */
 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' ), true ) ) {
 		return false;
 	}
 	$timezone = strtolower( $timezone );
 			break;
 		case 'blog':
 			$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;
 		case 'server':
-			$add_seconds_server = date( 'Z' );
+			$add_seconds_server = gmdate( 'Z' );
 			$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" );
 			break;
 	}
 	if ( $date ) {
 /**
 * Updates posts in cache.
 *
 * @since 1.5.1
 *
-* @param array $posts Array of post objects (passed by reference).
+* @param WP_Post[] $posts Array of post objects (passed by reference).
 */
 function update_post_cache( &$posts ) {
 	if ( ! $posts ) {
 		return;
 	}
 	 * @param int     $post_id Post ID.
 	 * @param WP_Post $post    Post object.
 	 */
 	do_action( 'clean_post_cache', $post->ID, $post );
-	if ( 'page' == $post->post_type ) {
+	if ( 'page' === $post->post_type ) {
 		wp_cache_delete( 'all_page_ids', 'posts' );
 		/**
 		 * Fires immediately after the given page's cache is cleaned.
 		 *
 /**
 * Call major cache updating functions for list of Post objects.
 *
 * @since 1.5.0
 *
-* @param array  $posts             Array of Post objects
+* @param WP_Post[] $posts             Array of Post objects
-* @param string $post_type         Optional. Post type. Default 'post'.
+* @param string    $post_type         Optional. Post type. Default 'post'.
-* @param bool   $update_term_cache Optional. Whether to update the term cache. Default true.
+* @param bool      $update_term_cache Optional. Whether to update the term cache. Default true.
-* @param bool   $update_meta_cache Optional. Whether to update the meta cache. Default true.
+* @param bool      $update_meta_cache Optional. Whether to update the meta cache. Default true.
 */
 function update_post_caches( &$posts, $post_type = 'post', $update_term_cache = true, $update_meta_cache = true ) {
 	// No point in doing all this work if we didn't match any posts.
 	if ( ! $posts ) {
 		return;
 	}
 	if ( $update_term_cache ) {
 		if ( is_array( $post_type ) ) {
 			$ptypes = $post_type;
-		} elseif ( 'any' == $post_type ) {
+		} elseif ( 'any' === $post_type ) {
 			$ptypes = array();
 			// Just use the post_types in the supplied posts.
 			foreach ( $posts as $post ) {
 				$ptypes[] = $post->post_type;
 			}
 * metadata cache for the posts. Therefore, the functions, which call this
 * function, do not need to perform SQL queries on their own.
 *
 * @since 2.1.0
 *
-* @param array $post_ids List of post IDs.
+* @param int[] $post_ids Array of post IDs.
-* @return array|false Returns false if there is nothing to update or an array
+* @return array|false An array of metadata on success, false if there is nothing to update.
-*                     of metadata.
 */
 function update_postmeta_cache( $post_ids ) {
 	return update_meta_cache( 'post', $post_ids );
 }
 	 */
 	do_action( 'clean_attachment_cache', $id );
 }
 //
-// Hooks
+// Hooks.
 //
 /**
 * Hook for managing future post transitions to published.
 *
 * @param WP_Post $post       Post object.
 */
 function _transition_post_status( $new_status, $old_status, $post ) {
 	global $wpdb;
-	if ( $old_status != 'publish' && $new_status == 'publish' ) {
+	if ( 'publish' !== $old_status && 'publish' === $new_status ) {
 		// Reset GUID if transitioning to publish and it is empty.
-		if ( '' == get_the_guid( $post->ID ) ) {
+		if ( '' === get_the_guid( $post->ID ) ) {
 			$wpdb->update( $wpdb->posts, array( 'guid' => get_permalink( $post->ID ) ), array( 'ID' => $post->ID ) );
 		}
 		/**
 		 * Fires when a post's status is transitioned from private to published.
 		 *
 		 * @since 1.5.0
-		 * @deprecated 2.3.0 Use 'private_to_publish' instead.
+		 * @deprecated 2.3.0 Use {@see 'private_to_publish'} instead.
 		 *
 		 * @param int $post_id Post ID.
 		 */
-		do_action( 'private_to_published', $post->ID );
+		do_action_deprecated( 'private_to_published', array( $post->ID ), '2.3.0', 'private_to_publish' );
 	}
 	// If published posts changed clear the lastpostmodified cache.
-	if ( 'publish' == $new_status || 'publish' == $old_status ) {
+	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 ( defined( 'WP_IMPORTING' ) ) {
 		return;
 	}
 	if ( get_option( 'default_pingback_flag' ) ) {
-		add_post_meta( $post_id, '_pingme', '1' );
+		add_post_meta( $post_id, '_pingme', '1', true );
 	}
-	add_post_meta( $post_id, '_encloseme', '1' );
+	add_post_meta( $post_id, '_encloseme', '1', true );
+	$to_ping = get_to_ping( $post_id );
+	if ( ! empty( $to_ping ) ) {
+		add_post_meta( $post_id, '_trackbackme', '1' );
+	}
 	if ( ! wp_next_scheduled( 'do_pings' ) ) {
 		wp_schedule_single_event( time(), 'do_pings' );
 	}
 }
 * Returns the ID of the post's parent.
 *
 * @since 3.1.0
 *
 * @param int|WP_Post $post Post ID or post object. Defaults to global $post.
-* @return int|false Post parent ID (which can be 0 if there is no parent), or false if the post does not exist.
+* @return int|false Post parent ID (which can be 0 if there is no parent),
+*                   or false if the post does not exist.
 */
 function wp_get_post_parent_id( $post ) {
 	$post = get_post( $post );
 	if ( ! $post || is_wp_error( $post ) ) {
 		return false;
 	if ( $post_parent == $post_ID ) {
 		return 0;
 	}
 	// Now look for larger loops.
-	if ( ! $loop = wp_find_hierarchy_loop( 'wp_get_post_parent_id', $post_ID, $post_parent ) ) {
+	$loop = wp_find_hierarchy_loop( 'wp_get_post_parent_id', $post_ID, $post_parent );
-		return $post_parent; // No loop
+	if ( ! $loop ) {
+		return $post_parent; // No loop.
 	}
 	// Setting $post_parent to the given value causes a loop.
 	if ( isset( $loop[ $post_ID ] ) ) {
 		return 0;
 * @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();
+	$post_type_taxonomies = array();
+	$term_ids             = array();
 	foreach ( $posts as $post ) {
 		if ( ! ( $post instanceof WP_Post ) ) {
 			continue;
 		}
 		wp_update_term_count( $tt_ids, $taxonomy );
 	}
 }
 /**
-* Adds any posts from the given ids to the cache that do not already exist in cache
+* Adds any posts from the given IDs to the cache that do not already exist in cache
 *
 * @since 3.4.0
 * @access private
 *
 * @see update_post_caches()
 * @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,
+* @param string[] $clauses An array including WHERE, GROUP BY, JOIN, ORDER BY,
-*                       DISTINCT, fields (SELECT), and LIMITS clauses.
+*                          DISTINCT, fields (SELECT), and LIMITS clauses.
-* @return array The modified clauses.
+* @return string[] The modified array of clauses.
 */
 function _filter_query_attachment_filenames( $clauses ) {
 	global $wpdb;
 	remove_filter( 'posts_clauses', __FUNCTION__ );
 	global $wpdb;
 	$types = $wpdb->get_col( $wpdb->prepare( "SELECT DISTINCT post_mime_type FROM $wpdb->posts WHERE post_type = %s", $type ) );
 	return $types;
 }
+/**
+* Retrieves the path to an uploaded image file.
+*
+* Similar to `get_attached_file()` however some images may have been processed after uploading
+* to make them suitable for web use. In this case the attached "full" size file is usually replaced
+* with a scaled down version of the original image. This function always returns the path
+* to the originally uploaded image file.
+*
+* @since 5.3.0
+* @since 5.4.0 Added the `$unfiltered` parameter.
+*
+* @param int  $attachment_id Attachment ID.
+* @param bool $unfiltered Optional. Passed through to `get_attached_file()`. Default false.
+* @return string|false Path to the original image file or false if the attachment is not an image.
+*/
+function wp_get_original_image_path( $attachment_id, $unfiltered = false ) {
+	if ( ! wp_attachment_is_image( $attachment_id ) ) {
+		return false;
+	}
+	$image_meta = wp_get_attachment_metadata( $attachment_id );
+	$image_file = get_attached_file( $attachment_id, $unfiltered );
+	if ( empty( $image_meta['original_image'] ) ) {
+		$original_image = $image_file;
+	} else {
+		$original_image = path_join( dirname( $image_file ), $image_meta['original_image'] );
+	}
+	/**
+	 * Filters the path to the original image.
+	 *
+	 * @since 5.3.0
+	 *
+	 * @param string $original_image Path to original image file.
+	 * @param int    $attachment_id  Attachment ID.
+	 */
+	return apply_filters( 'wp_get_original_image_path', $original_image, $attachment_id );
+}
+/**
+* Retrieve the URL to an original attachment image.
+*
+* Similar to `wp_get_attachment_url()` however some images may have been
+* processed after uploading. In this case this function returns the URL
+* to the originally uploaded image file.
+*
+* @since 5.3.0
+*
+* @param int $attachment_id Attachment post ID.
+* @return string|false Attachment image URL, false on error or if the attachment is not an image.
+*/
+function wp_get_original_image_url( $attachment_id ) {
+	if ( ! wp_attachment_is_image( $attachment_id ) ) {
+		return false;
+	}
+	$image_url = wp_get_attachment_url( $attachment_id );
+	if ( empty( $image_url ) ) {
+		return false;
+	}
+	$image_meta = wp_get_attachment_metadata( $attachment_id );
+	if ( empty( $image_meta['original_image'] ) ) {
+		$original_image_url = $image_url;
+	} else {
+		$original_image_url = path_join( dirname( $image_url ), $image_meta['original_image'] );
+	}
+	/**
+	 * Filters the URL to the original attachment image.
+	 *
+	 * @since 5.3.0
+	 *
+	 * @param string $original_image_url URL to original image.
+	 * @param int    $attachment_id      Attachment ID.
+	 */
+	return apply_filters( 'wp_get_original_image_url', $original_image_url, $attachment_id );
+}

changeset 16	a86126ab1dd4
parent 9	177826044cd9
child 18	be944660c56a