wp/wp-includes/post.php
changeset 21 48c4eec2b7e6
parent 19 3d72ae0968f4
child 22 8c2e4d02f4ef
--- a/wp/wp-includes/post.php	Thu Sep 29 08:06:27 2022 +0200
+++ b/wp/wp-includes/post.php	Fri Sep 05 18:40:08 2025 +0200
@@ -75,9 +75,9 @@
 			'labels'                => array(
 				'name'           => _x( 'Media', 'post type general name' ),
 				'name_admin_bar' => _x( 'Media', 'add new from admin bar' ),
-				'add_new'        => _x( 'Add New', 'add new media' ),
+				'add_new'        => __( 'Add New Media File' ),
 				'edit_item'      => __( 'Edit Media' ),
-				'view_item'      => __( 'View Attachment Page' ),
+				'view_item'      => ( '1' === get_option( 'wp_attachment_pages_enabled' ) ) ? __( 'View Attachment Page' ) : __( 'View Media File' ),
 				'attributes'     => __( 'Attachment Attributes' ),
 			),
 			'public'                => true,
@@ -202,7 +202,7 @@
 			'labels'           => array(
 				'name'               => _x( 'Changesets', 'post type general name' ),
 				'singular_name'      => _x( 'Changeset', 'post type singular name' ),
-				'add_new'            => _x( 'Add New', 'Customize Changeset' ),
+				'add_new'            => __( 'Add New Changeset' ),
 				'add_new_item'       => __( 'Add New Changeset' ),
 				'new_item'           => __( 'New Changeset' ),
 				'edit_item'          => __( 'Edit Changeset' ),
@@ -282,25 +282,26 @@
 		'wp_block',
 		array(
 			'labels'                => array(
-				'name'                     => _x( 'Reusable blocks', 'post type general name' ),
-				'singular_name'            => _x( 'Reusable block', 'post type singular name' ),
-				'add_new'                  => _x( 'Add New', 'Reusable block' ),
-				'add_new_item'             => __( 'Add new Reusable block' ),
-				'new_item'                 => __( 'New Reusable block' ),
-				'edit_item'                => __( 'Edit Reusable block' ),
-				'view_item'                => __( 'View Reusable block' ),
-				'all_items'                => __( 'All Reusable blocks' ),
-				'search_items'             => __( 'Search Reusable blocks' ),
-				'not_found'                => __( 'No reusable blocks found.' ),
-				'not_found_in_trash'       => __( 'No reusable blocks found in Trash.' ),
-				'filter_items_list'        => __( 'Filter reusable blocks list' ),
-				'items_list_navigation'    => __( 'Reusable blocks list navigation' ),
-				'items_list'               => __( 'Reusable blocks list' ),
-				'item_published'           => __( 'Reusable block published.' ),
-				'item_published_privately' => __( 'Reusable block published privately.' ),
-				'item_reverted_to_draft'   => __( 'Reusable block reverted to draft.' ),
-				'item_scheduled'           => __( 'Reusable block scheduled.' ),
-				'item_updated'             => __( 'Reusable block updated.' ),
+				'name'                     => _x( 'Patterns', 'post type general name' ),
+				'singular_name'            => _x( 'Pattern', 'post type singular name' ),
+				'add_new'                  => __( 'Add New Pattern' ),
+				'add_new_item'             => __( 'Add New Pattern' ),
+				'new_item'                 => __( 'New Pattern' ),
+				'edit_item'                => __( 'Edit Block Pattern' ),
+				'view_item'                => __( 'View Pattern' ),
+				'view_items'               => __( 'View Patterns' ),
+				'all_items'                => __( 'All Patterns' ),
+				'search_items'             => __( 'Search Patterns' ),
+				'not_found'                => __( 'No patterns found.' ),
+				'not_found_in_trash'       => __( 'No patterns found in Trash.' ),
+				'filter_items_list'        => __( 'Filter patterns list' ),
+				'items_list_navigation'    => __( 'Patterns list navigation' ),
+				'items_list'               => __( 'Patterns list' ),
+				'item_published'           => __( 'Pattern published.' ),
+				'item_published_privately' => __( 'Pattern published privately.' ),
+				'item_reverted_to_draft'   => __( 'Pattern reverted to draft.' ),
+				'item_scheduled'           => __( 'Pattern scheduled.' ),
+				'item_updated'             => __( 'Pattern updated.' ),
 			),
 			'public'                => false,
 			'_builtin'              => true, /* internal use only. don't use this when registering your own post type. */
@@ -319,25 +320,37 @@
 				'edit_posts'             => 'edit_posts',
 				'edit_published_posts'   => 'edit_published_posts',
 				'delete_published_posts' => 'delete_published_posts',
+				// Enables trashing draft posts as well.
+				'delete_posts'           => 'delete_posts',
 				'edit_others_posts'      => 'edit_others_posts',
 				'delete_others_posts'    => 'delete_others_posts',
 			),
 			'map_meta_cap'          => true,
 			'supports'              => array(
 				'title',
+				'excerpt',
 				'editor',
 				'revisions',
+				'custom-fields',
 			),
 		)
 	);
 
+	$template_edit_link = 'site-editor.php?' . build_query(
+		array(
+			'postType' => '%s',
+			'postId'   => '%s',
+			'canvas'   => 'edit',
+		)
+	);
+
 	register_post_type(
 		'wp_template',
 		array(
-			'labels'                => array(
+			'labels'                          => array(
 				'name'                  => _x( 'Templates', 'post type general name' ),
 				'singular_name'         => _x( 'Template', 'post type singular name' ),
-				'add_new'               => _x( 'Add New', 'Template' ),
+				'add_new'               => __( 'Add New Template' ),
 				'add_new_item'          => __( 'Add New Template' ),
 				'new_item'              => __( 'New Template' ),
 				'edit_item'             => __( 'Edit Template' ),
@@ -353,19 +366,24 @@
 				'filter_items_list'     => __( 'Filter templates list' ),
 				'items_list_navigation' => __( 'Templates list navigation' ),
 				'items_list'            => __( 'Templates list' ),
+				'item_updated'          => __( 'Template updated.' ),
 			),
-			'description'           => __( 'Templates to include in your theme.' ),
-			'public'                => false,
-			'_builtin'              => true, /* internal use only. don't use this when registering your own post type. */
-			'has_archive'           => false,
-			'show_ui'               => false,
-			'show_in_menu'          => false,
-			'show_in_rest'          => true,
-			'rewrite'               => false,
-			'rest_base'             => 'templates',
-			'rest_controller_class' => 'WP_REST_Templates_Controller',
-			'capability_type'       => array( 'template', 'templates' ),
-			'capabilities'          => array(
+			'description'                     => __( 'Templates to include in your theme.' ),
+			'public'                          => false,
+			'_builtin'                        => true, /* internal use only. don't use this when registering your own post type. */
+			'_edit_link'                      => $template_edit_link, /* internal use only. don't use this when registering your own post type. */
+			'has_archive'                     => false,
+			'show_ui'                         => false,
+			'show_in_menu'                    => false,
+			'show_in_rest'                    => true,
+			'rewrite'                         => false,
+			'rest_base'                       => 'templates',
+			'rest_controller_class'           => 'WP_REST_Templates_Controller',
+			'autosave_rest_controller_class'  => 'WP_REST_Template_Autosaves_Controller',
+			'revisions_rest_controller_class' => 'WP_REST_Template_Revisions_Controller',
+			'late_route_registration'         => true,
+			'capability_type'                 => array( 'template', 'templates' ),
+			'capabilities'                    => array(
 				'create_posts'           => 'edit_theme_options',
 				'delete_posts'           => 'edit_theme_options',
 				'delete_others_posts'    => 'edit_theme_options',
@@ -379,8 +397,8 @@
 				'read'                   => 'edit_theme_options',
 				'read_private_posts'     => 'edit_theme_options',
 			),
-			'map_meta_cap'          => true,
-			'supports'              => array(
+			'map_meta_cap'                    => true,
+			'supports'                        => array(
 				'title',
 				'slug',
 				'excerpt',
@@ -394,10 +412,10 @@
 	register_post_type(
 		'wp_template_part',
 		array(
-			'labels'                => array(
+			'labels'                          => array(
 				'name'                  => _x( 'Template Parts', 'post type general name' ),
 				'singular_name'         => _x( 'Template Part', 'post type singular name' ),
-				'add_new'               => _x( 'Add New', 'Template Part' ),
+				'add_new'               => __( 'Add New Template Part' ),
 				'add_new_item'          => __( 'Add New Template Part' ),
 				'new_item'              => __( 'New Template Part' ),
 				'edit_item'             => __( 'Edit Template Part' ),
@@ -413,19 +431,24 @@
 				'filter_items_list'     => __( 'Filter template parts list' ),
 				'items_list_navigation' => __( 'Template parts list navigation' ),
 				'items_list'            => __( 'Template parts list' ),
+				'item_updated'          => __( 'Template part updated.' ),
 			),
-			'description'           => __( 'Template parts to include in your templates.' ),
-			'public'                => false,
-			'_builtin'              => true, /* internal use only. don't use this when registering your own post type. */
-			'has_archive'           => false,
-			'show_ui'               => false,
-			'show_in_menu'          => false,
-			'show_in_rest'          => true,
-			'rewrite'               => false,
-			'rest_base'             => 'template-parts',
-			'rest_controller_class' => 'WP_REST_Templates_Controller',
-			'map_meta_cap'          => true,
-			'capabilities'          => array(
+			'description'                     => __( 'Template parts to include in your templates.' ),
+			'public'                          => false,
+			'_builtin'                        => true, /* internal use only. don't use this when registering your own post type. */
+			'_edit_link'                      => $template_edit_link, /* internal use only. don't use this when registering your own post type. */
+			'has_archive'                     => false,
+			'show_ui'                         => false,
+			'show_in_menu'                    => false,
+			'show_in_rest'                    => true,
+			'rewrite'                         => false,
+			'rest_base'                       => 'template-parts',
+			'rest_controller_class'           => 'WP_REST_Templates_Controller',
+			'autosave_rest_controller_class'  => 'WP_REST_Template_Autosaves_Controller',
+			'revisions_rest_controller_class' => 'WP_REST_Template_Revisions_Controller',
+			'late_route_registration'         => true,
+			'map_meta_cap'                    => true,
+			'capabilities'                    => array(
 				'create_posts'           => 'edit_theme_options',
 				'delete_posts'           => 'edit_theme_options',
 				'delete_others_posts'    => 'edit_theme_options',
@@ -439,7 +462,7 @@
 				'read'                   => 'edit_theme_options',
 				'read_private_posts'     => 'edit_theme_options',
 			),
-			'supports'              => array(
+			'supports'                        => array(
 				'title',
 				'slug',
 				'excerpt',
@@ -453,14 +476,19 @@
 	register_post_type(
 		'wp_global_styles',
 		array(
-			'label'        => _x( 'Global Styles', 'post type general name' ),
-			'description'  => __( 'Global styles to include in themes.' ),
-			'public'       => false,
-			'_builtin'     => true, /* internal use only. don't use this when registering your own post type. */
-			'show_ui'      => false,
-			'show_in_rest' => false,
-			'rewrite'      => false,
-			'capabilities' => array(
+			'label'                           => _x( 'Global Styles', 'post type general name' ),
+			'description'                     => __( 'Global styles to include in themes.' ),
+			'public'                          => false,
+			'_builtin'                        => true, /* internal use only. don't use this when registering your own post type. */
+			'_edit_link'                      => '/site-editor.php?canvas=edit', /* internal use only. don't use this when registering your own post type. */
+			'show_ui'                         => false,
+			'show_in_rest'                    => true,
+			'rewrite'                         => false,
+			'rest_base'                       => 'global-styles',
+			'rest_controller_class'           => 'WP_REST_Global_Styles_Controller',
+			'revisions_rest_controller_class' => 'WP_REST_Global_Styles_Revisions_Controller',
+			'late_route_registration'         => true,
+			'capabilities'                    => array(
 				'read'                   => 'edit_theme_options',
 				'create_posts'           => 'edit_theme_options',
 				'edit_posts'             => 'edit_theme_options',
@@ -469,14 +497,24 @@
 				'edit_others_posts'      => 'edit_theme_options',
 				'delete_others_posts'    => 'edit_theme_options',
 			),
-			'map_meta_cap' => true,
-			'supports'     => array(
+			'map_meta_cap'                    => true,
+			'supports'                        => array(
 				'title',
 				'editor',
 				'revisions',
 			),
 		)
 	);
+	// Disable autosave endpoints for global styles.
+	remove_post_type_support( 'wp_global_styles', 'autosave' );
+
+	$navigation_post_edit_link = 'site-editor.php?' . build_query(
+		array(
+			'postId'   => '%s',
+			'postType' => 'wp_navigation',
+			'canvas'   => 'edit',
+		)
+	);
 
 	register_post_type(
 		'wp_navigation',
@@ -484,7 +522,7 @@
 			'labels'                => array(
 				'name'                  => _x( 'Navigation Menus', 'post type general name' ),
 				'singular_name'         => _x( 'Navigation Menu', 'post type singular name' ),
-				'add_new'               => _x( 'Add New', 'Navigation Menu' ),
+				'add_new'               => __( 'Add New Navigation Menu' ),
 				'add_new_item'          => __( 'Add New Navigation Menu' ),
 				'new_item'              => __( 'New Navigation Menu' ),
 				'edit_item'             => __( 'Edit Navigation Menu' ),
@@ -504,6 +542,7 @@
 			'description'           => __( 'Navigation menus that can be inserted into your site.' ),
 			'public'                => false,
 			'_builtin'              => true, /* internal use only. don't use this when registering your own post type. */
+			'_edit_link'            => $navigation_post_edit_link, /* internal use only. don't use this when registering your own post type. */
 			'has_archive'           => false,
 			'show_ui'               => true,
 			'show_in_menu'          => false,
@@ -534,6 +573,70 @@
 		)
 	);
 
+	register_post_type(
+		'wp_font_family',
+		array(
+			'labels'                => array(
+				'name'          => __( 'Font Families' ),
+				'singular_name' => __( 'Font Family' ),
+			),
+			'public'                => false,
+			'_builtin'              => true, /* internal use only. don't use this when registering your own post type. */
+			'hierarchical'          => false,
+			'capabilities'          => array(
+				'read'                   => 'edit_theme_options',
+				'read_private_posts'     => 'edit_theme_options',
+				'create_posts'           => 'edit_theme_options',
+				'publish_posts'          => 'edit_theme_options',
+				'edit_posts'             => 'edit_theme_options',
+				'edit_others_posts'      => 'edit_theme_options',
+				'edit_published_posts'   => 'edit_theme_options',
+				'delete_posts'           => 'edit_theme_options',
+				'delete_others_posts'    => 'edit_theme_options',
+				'delete_published_posts' => 'edit_theme_options',
+			),
+			'map_meta_cap'          => true,
+			'query_var'             => false,
+			'rewrite'               => false,
+			'show_in_rest'          => true,
+			'rest_base'             => 'font-families',
+			'rest_controller_class' => 'WP_REST_Font_Families_Controller',
+			'supports'              => array( 'title' ),
+		)
+	);
+
+	register_post_type(
+		'wp_font_face',
+		array(
+			'labels'                => array(
+				'name'          => __( 'Font Faces' ),
+				'singular_name' => __( 'Font Face' ),
+			),
+			'public'                => false,
+			'_builtin'              => true, /* internal use only. don't use this when registering your own post type. */
+			'hierarchical'          => false,
+			'capabilities'          => array(
+				'read'                   => 'edit_theme_options',
+				'read_private_posts'     => 'edit_theme_options',
+				'create_posts'           => 'edit_theme_options',
+				'publish_posts'          => 'edit_theme_options',
+				'edit_posts'             => 'edit_theme_options',
+				'edit_others_posts'      => 'edit_theme_options',
+				'edit_published_posts'   => 'edit_theme_options',
+				'delete_posts'           => 'edit_theme_options',
+				'delete_others_posts'    => 'edit_theme_options',
+				'delete_published_posts' => 'edit_theme_options',
+			),
+			'map_meta_cap'          => true,
+			'query_var'             => false,
+			'rewrite'               => false,
+			'show_in_rest'          => true,
+			'rest_base'             => 'font-families/(?P<font_family_id>[\d]+)/font-faces',
+			'rest_controller_class' => 'WP_REST_Font_Faces_Controller',
+			'supports'              => array( 'title' ),
+		)
+	);
+
 	register_post_status(
 		'publish',
 		array(
@@ -703,28 +806,27 @@
 }
 
 /**
- * Retrieve attached file path based on attachment ID.
- *
- * By default the path will go through the 'get_attached_file' filter, but
- * passing a true to the $unfiltered argument of get_attached_file() will
- * return the file path unfiltered.
- *
- * The function works by getting the single post meta name, named
- * '_wp_attached_file' and returning it. This is a convenience function to
- * prevent looking up the meta name and provide a mechanism for sending the
- * attached filename through a filter.
+ * Retrieves attached file path based on attachment ID.
+ *
+ * By default the path will go through the {@see 'get_attached_file'} filter, but
+ * passing `true` to the `$unfiltered` argument will return the file path unfiltered.
+ *
+ * The function works by retrieving the `_wp_attached_file` post meta value.
+ * This is a convenience function to prevent looking up the meta name and provide
+ * a mechanism for sending the attached filename through a filter.
  *
  * @since 2.0.0
  *
  * @param int  $attachment_id Attachment ID.
- * @param bool $unfiltered    Optional. Whether to apply filters. Default false.
+ * @param bool $unfiltered    Optional. Whether to skip the {@see 'get_attached_file'} filter.
+ *                            Default false.
  * @return string|false The file path to where the attached file should be, false otherwise.
  */
 function get_attached_file( $attachment_id, $unfiltered = false ) {
 	$file = get_post_meta( $attachment_id, '_wp_attached_file', true );
 
 	// If the file is relative, prepend upload dir.
-	if ( $file && 0 !== strpos( $file, '/' ) && ! preg_match( '|^.:\\\|', $file ) ) {
+	if ( $file && ! str_starts_with( $file, '/' ) && ! preg_match( '|^.:\\\|', $file ) ) {
 		$uploads = wp_get_upload_dir();
 		if ( false === $uploads['error'] ) {
 			$file = $uploads['basedir'] . "/$file";
@@ -747,7 +849,7 @@
 }
 
 /**
- * Update attachment file path based on attachment ID.
+ * Updates attachment file path based on attachment ID.
  *
  * Used to update the file path of the attachment, which uses post meta name
  * '_wp_attached_file' to store the path of the attachment.
@@ -782,7 +884,7 @@
 }
 
 /**
- * Return relative path to an uploaded file.
+ * Returns relative path to an uploaded file.
  *
  * The path is relative to the current upload dir.
  *
@@ -796,7 +898,7 @@
 	$new_path = $path;
 
 	$uploads = wp_get_upload_dir();
-	if ( 0 === strpos( $new_path, $uploads['basedir'] ) ) {
+	if ( str_starts_with( $new_path, $uploads['basedir'] ) ) {
 			$new_path = str_replace( $uploads['basedir'], '', $new_path );
 			$new_path = ltrim( $new_path, '/' );
 	}
@@ -813,7 +915,7 @@
 }
 
 /**
- * Retrieve all children of the post parent ID.
+ * Retrieves all children of the post parent ID.
  *
  * Normally, without any enhancements, the children would apply to pages. In the
  * context of the inner workings of WordPress, pages, posts, and attachments
@@ -861,7 +963,7 @@
  * @param string $output Optional. The required return type. One of OBJECT, ARRAY_A, or ARRAY_N, which
  *                       correspond to a WP_Post object, an associative array, or a numeric array,
  *                       respectively. Default OBJECT.
- * @return WP_Post[]|int[] Array of post objects or post IDs.
+ * @return WP_Post[]|array[]|int[] Array of post objects, arrays, or IDs, depending on `$output`.
  */
 function get_children( $args = '', $output = OBJECT ) {
 	$kids = array();
@@ -922,7 +1024,7 @@
 }
 
 /**
- * Get extended entry info (<!--more-->).
+ * Gets extended entry info (<!--more-->).
  *
  * There should not be any space after the second dash and before the word
  * 'more'. There can be text or space(s) after the word 'more', but won't be
@@ -1056,7 +1158,7 @@
 }
 
 /**
- * Retrieve data from a post field based on Post ID.
+ * Retrieves data from a post field based on Post ID.
  *
  * Examples of the post field will be, 'post_type', 'post_status', 'post_content',
  * etc and based off of the post object property or key names.
@@ -1090,7 +1192,7 @@
 }
 
 /**
- * Retrieve the mime type of an attachment based on the ID.
+ * Retrieves the mime type of an attachment based on the ID.
  *
  * This function can be used with any post type, but it makes more sense with
  * attachments.
@@ -1111,7 +1213,7 @@
 }
 
 /**
- * Retrieve the post status based on the post ID.
+ * Retrieves the post status based on the post ID.
  *
  * If the post ID is of an attachment, then the parent post status will be given
  * instead.
@@ -1122,7 +1224,10 @@
  * @return string|false Post status on success, false on failure.
  */
 function get_post_status( $post = null ) {
-	$post = get_post( $post );
+	// Normalize the post object if necessary, skip normalization if called from get_sample_permalink().
+	if ( ! $post instanceof WP_Post || ! isset( $post->filter ) || 'sample' !== $post->filter ) {
+		$post = get_post( $post );
+	}
 
 	if ( ! is_object( $post ) ) {
 		return false;
@@ -1144,6 +1249,7 @@
 		} elseif ( 'trash' === get_post_status( $post->post_parent ) ) {
 			// Get parent status prior to trashing.
 			$post_status = get_post_meta( $post->post_parent, '_wp_trash_meta_status', true );
+
 			if ( ! $post_status ) {
 				// Assume publish as above.
 				$post_status = 'publish';
@@ -1178,7 +1284,7 @@
 }
 
 /**
- * Retrieve all of the WordPress supported post statuses.
+ * Retrieves all of the WordPress supported post statuses.
  *
  * Posts have a limited set of valid status values, this provides the
  * post_status values and descriptions.
@@ -1199,7 +1305,7 @@
 }
 
 /**
- * Retrieve all of the WordPress support page statuses.
+ * Retrieves all of the WordPress support page statuses.
  *
  * Pages have a limited set of valid status values, this provides the
  * post_status values and descriptions.
@@ -1219,12 +1325,12 @@
 }
 
 /**
- * Return statuses for privacy requests.
+ * Returns statuses for privacy requests.
  *
  * @since 4.9.6
  * @access private
  *
- * @return array
+ * @return string[] Array of privacy request status labels keyed by their status.
  */
 function _wp_privacy_statuses() {
 	return array(
@@ -1236,7 +1342,7 @@
 }
 
 /**
- * Register a post status. Do not use before init.
+ * Registers a post status. Do not use before init.
  *
  * A simple function for creating or modifying a post status based on the
  * parameters given. The function will accept an array (second optional
@@ -1254,8 +1360,10 @@
  *
  *     @type bool|string $label                     A descriptive name for the post status marked
  *                                                  for translation. Defaults to value of $post_status.
- *     @type bool|array  $label_count               Descriptive text to use for nooped plurals.
- *                                                  Default array of $label, twice.
+ *     @type array|false $label_count               Nooped plural text from _n_noop() to provide the singular
+ *                                                  and plural forms of the label for counts. Default false
+ *                                                  which means the `$label` argument will be used for both
+ *                                                  the singular and plural forms of this label.
  *     @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.
@@ -1356,7 +1464,7 @@
 	}
 
 	if ( false === $args->label_count ) {
-		// phpcs:ignore WordPress.WP.I18n.NonSingularStringLiteralSingle,WordPress.WP.I18n.NonSingularStringLiteralPlural
+		// phpcs:ignore WordPress.WP.I18n.NonSingularStringLiteralSingular,WordPress.WP.I18n.NonSingularStringLiteralPlural
 		$args->label_count = _n_noop( $args->label, $args->label );
 	}
 
@@ -1366,7 +1474,7 @@
 }
 
 /**
- * Retrieve a post status object by name.
+ * Retrieves a post status object by name.
  *
  * @since 3.0.0
  *
@@ -1388,7 +1496,7 @@
 }
 
 /**
- * Get a list of post statuses.
+ * Gets a list of post statuses.
  *
  * @since 3.0.0
  *
@@ -1413,7 +1521,7 @@
 }
 
 /**
- * Whether the post type is hierarchical.
+ * Determines whether the post type is hierarchical.
  *
  * A false return value might also mean that the post type does not exist.
  *
@@ -1492,7 +1600,7 @@
 }
 
 /**
- * Get a list of all registered post type objects.
+ * Gets a list of all registered post type objects.
  *
  * @since 2.9.0
  *
@@ -1502,7 +1610,7 @@
  *
  * @param array|string $args     Optional. An array of key => value arguments to match against
  *                               the post type objects. Default empty array.
- * @param string       $output   Optional. The type of output to return. Accepts post type 'names'
+ * @param string       $output   Optional. The type of output to return. Either 'names'
  *                               or 'objects'. Default 'names'.
  * @param string       $operator Optional. The logical operation to perform. 'or' means only one
  *                               element from the array needs to match; 'and' means all elements
@@ -1544,91 +1652,97 @@
  *
  * @global array $wp_post_types List of post types.
  *
- * @param string       $post_type Post type key. Must not exceed 20 characters and may
- *                                only contain lowercase alphanumeric characters, dashes,
- *                                and underscores. See sanitize_key().
+ * @param string       $post_type Post type key. Must not exceed 20 characters and may only contain
+ *                                lowercase alphanumeric characters, dashes, and underscores. See sanitize_key().
  * @param array|string $args {
  *     Array or string of arguments for registering a post type.
  *
- *     @type string       $label                 Name of the post type shown in the menu. Usually plural.
- *                                               Default is value of $labels['name'].
- *     @type string[]     $labels                An array of labels for this post type. If not set, post
- *                                               labels are inherited for non-hierarchical types and page
- *                                               labels for hierarchical ones. See get_post_type_labels() for a full
- *                                               list of supported labels.
- *     @type string       $description           A short descriptive summary of what the post type is.
- *                                               Default empty.
- *     @type bool         $public                Whether a post type is intended for use publicly either via
- *                                               the admin interface or by front-end users. While the default
- *                                               settings of $exclude_from_search, $publicly_queryable, $show_ui,
- *                                               and $show_in_nav_menus are inherited from $public, each does not
- *                                               rely on this relationship and controls a very specific intention.
- *                                               Default false.
- *     @type bool         $hierarchical          Whether the post type is hierarchical (e.g. page). Default false.
- *     @type bool         $exclude_from_search   Whether to exclude posts with this post type from front end search
- *                                               results. Default is the opposite value of $public.
- *     @type bool         $publicly_queryable    Whether queries can be performed on the front end for the post type
- *                                               as part of parse_request(). Endpoints would include:
- *                                               * ?post_type={post_type_key}
- *                                               * ?{post_type_key}={single_post_slug}
- *                                               * ?{post_type_query_var}={single_post_slug}
- *                                               If not set, the default is inherited from $public.
- *     @type bool         $show_ui               Whether to generate and allow a UI for managing this post type in the
- *                                               admin. Default is value of $public.
- *     @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 ('tools.php' or 'edit.php?post_type=page', for example), 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 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 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_namespace        To change the namespace URL of REST API route. Default is wp/v2.
- *     @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
- *                                               SVG using a data URI, which will be colored to match the color scheme
- *                                               -- this should begin with 'data:image/svg+xml;base64,'. Pass the name
- *                                               of a Dashicons helper class to use a font icon, e.g.
- *                                               'dashicons-chart-pie'. Pass 'none' to leave div.wp-menu-image empty
- *                                               so an icon can be added via CSS. Defaults to use the posts icon.
- *     @type string|array $capability_type       The string to use to build the read, edit, and delete capabilities.
- *                                               May be passed as an array to allow for alternative plurals when using
- *                                               this argument as a base to construct the capabilities, e.g.
- *                                               array('story', 'stories'). Default 'post'.
- *     @type string[]     $capabilities          Array of capabilities for this post type. $capability_type is used
- *                                               as a base to construct capabilities by default.
- *                                               See get_post_type_capabilities().
- *     @type bool         $map_meta_cap          Whether to use the internal default meta capability handling.
- *                                               Default false.
- *     @type array        $supports              Core feature(s) the post type supports. Serves as an alias for calling
- *                                               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. A feature can also be
- *                                               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 string[]     $taxonomies            An array of taxonomy identifiers that will be registered for the
- *                                               post type. Taxonomies can be registered later with register_taxonomy()
- *                                               or register_taxonomy_for_object_type().
- *                                               Default empty array.
- *     @type bool|string  $has_archive           Whether there should be post type archives, or if a string, the
- *                                               archive slug to use. Will generate the proper rewrite rules if
- *                                               $rewrite is enabled. Default false.
- *     @type bool|array   $rewrite               {
+ *     @type string       $label                           Name of the post type shown in the menu. Usually plural.
+ *                                                         Default is value of $labels['name'].
+ *     @type string[]     $labels                          An array of labels for this post type. If not set, post
+ *                                                         labels are inherited for non-hierarchical types and page
+ *                                                         labels for hierarchical ones. See get_post_type_labels() for a full
+ *                                                         list of supported labels.
+ *     @type string       $description                     A short descriptive summary of what the post type is.
+ *                                                         Default empty.
+ *     @type bool         $public                          Whether a post type is intended for use publicly either via
+ *                                                         the admin interface or by front-end users. While the default
+ *                                                         settings of $exclude_from_search, $publicly_queryable, $show_ui,
+ *                                                         and $show_in_nav_menus are inherited from $public, each does not
+ *                                                         rely on this relationship and controls a very specific intention.
+ *                                                         Default false.
+ *     @type bool         $hierarchical                    Whether the post type is hierarchical (e.g. page). Default false.
+ *     @type bool         $exclude_from_search             Whether to exclude posts with this post type from front end search
+ *                                                         results. Default is the opposite value of $public.
+ *     @type bool         $publicly_queryable              Whether queries can be performed on the front end for the post type
+ *                                                         as part of parse_request(). Endpoints would include:
+ *                                                          * ?post_type={post_type_key}
+ *                                                          * ?{post_type_key}={single_post_slug}
+ *                                                          * ?{post_type_query_var}={single_post_slug}
+ *                                                         If not set, the default is inherited from $public.
+ *     @type bool         $show_ui                         Whether to generate and allow a UI for managing this post type in the
+ *                                                         admin. Default is value of $public.
+ *     @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 ('tools.php' or 'edit.php?post_type=page', for example), 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 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 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_namespace                  To change the namespace URL of REST API route. Default is wp/v2.
+ *     @type string       $rest_controller_class           REST API controller class name. Default is 'WP_REST_Posts_Controller'.
+ *     @type string|bool  $autosave_rest_controller_class  REST API controller class name. Default is 'WP_REST_Autosaves_Controller'.
+ *     @type string|bool  $revisions_rest_controller_class REST API controller class name. Default is 'WP_REST_Revisions_Controller'.
+ *     @type bool         $late_route_registration         A flag to direct the REST API controllers for autosave / revisions
+ *                                                         should be registered before/after the post type 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
+ *                                                         SVG using a data URI, which will be colored to match the color scheme
+ *                                                         -- this should begin with 'data:image/svg+xml;base64,'. Pass the name
+ *                                                         of a Dashicons helper class to use a font icon, e.g.
+ *                                                        'dashicons-chart-pie'. Pass 'none' to leave div.wp-menu-image empty
+ *                                                         so an icon can be added via CSS. Defaults to use the posts icon.
+ *     @type string|array $capability_type                 The string to use to build the read, edit, and delete capabilities.
+ *                                                         May be passed as an array to allow for alternative plurals when using
+ *                                                         this argument as a base to construct the capabilities, e.g.
+ *                                                         array('story', 'stories'). Default 'post'.
+ *     @type string[]     $capabilities                    Array of capabilities for this post type. $capability_type is used
+ *                                                         as a base to construct capabilities by default.
+ *                                                         See get_post_type_capabilities().
+ *     @type bool         $map_meta_cap                    Whether to use the internal default meta capability handling.
+ *                                                         Default false.
+ *     @type array|false  $supports                        Core feature(s) the post type supports. Serves as an alias for calling
+ *                                                         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, the 'autosave' feature dictates whether the post type
+ *                                                         will be autosaved, and the 'comments' feature dictates whether the
+ *                                                         comments count will show on the edit screen. For backward compatibility reasons,
+ *                                                         adding 'editor' support implies 'autosave' support too. A feature can also be
+ *                                                         specified as an array of arguments to provide additional information
+ *                                                         about supporting that feature.
+ *                                                         Example: `array( 'my_feature', array( 'field' => 'value' ) )`.
+ *                                                         If false, no features will be added.
+ *                                                         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 string[]     $taxonomies                      An array of taxonomy identifiers that will be registered for the
+ *                                                         post type. Taxonomies can be registered later with register_taxonomy()
+ *                                                         or register_taxonomy_for_object_type().
+ *                                                         Default empty array.
+ *     @type bool|string  $has_archive                     Whether there should be post type archives, or if a string, the
+ *                                                         archive slug to use. Will generate the proper rewrite rules if
+ *                                                         $rewrite is enabled. Default false.
+ *     @type bool|array   $rewrite                         {
  *         Triggers the handling of rewrites for this post type. To prevent rewrite, set to false.
  *         Defaults to true, using $post_type as slug. To specify rewrite rules, an array can be
  *         passed with any of these keys:
@@ -1643,32 +1757,32 @@
  *                                  inherits from $permalink_epmask. If not specified and permalink_epmask
  *                                  is not set, defaults to EP_PERMALINK.
  *     }
- *     @type string|bool  $query_var             Sets the query_var key for this post type. Defaults to $post_type
- *                                               key. If false, a post type cannot be loaded at
- *                                               ?{query_var}={post_slug}. If specified as a string, the query
- *                                               ?{query_var_string}={post_slug} will be valid.
- *     @type bool         $can_export            Whether to allow this post type to be exported. Default true.
- *     @type bool         $delete_with_user      Whether to delete posts of this type when deleting a user.
- *                                               * If true, posts of this type belonging to the user will be moved
- *                                                 to Trash when the 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
- *                                                 the 'author' feature. Otherwise posts are not trashed or deleted.
- *                                               Default null.
- *     @type array        $template              Array of blocks to use as the default initial state for an editor
- *                                               session. Each item should be an array containing block name and
- *                                               optional attributes. Default empty array.
- *     @type string|false $template_lock         Whether the block template should be locked if $template is set.
- *                                               * If set to 'all', the user is unable to insert new blocks,
- *                                                 move existing blocks and delete blocks.
- *                                               * If set to 'insert', the user is able to move existing blocks
- *                                                 but is unable to insert new blocks and delete blocks.
- *                                               Default false.
- *     @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'.
+ *     @type string|bool  $query_var                      Sets the query_var key for this post type. Defaults to $post_type
+ *                                                        key. If false, a post type cannot be loaded at
+ *                                                        ?{query_var}={post_slug}. If specified as a string, the query
+ *                                                        ?{query_var_string}={post_slug} will be valid.
+ *     @type bool         $can_export                     Whether to allow this post type to be exported. Default true.
+ *     @type bool         $delete_with_user               Whether to delete posts of this type when deleting a user.
+ *                                                          * If true, posts of this type belonging to the user will be moved
+ *                                                            to Trash when the 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
+ *                                                            the 'author' feature. Otherwise posts are not trashed or deleted.
+ *                                                        Default null.
+ *     @type array        $template                       Array of blocks to use as the default initial state for an editor
+ *                                                        session. Each item should be an array containing block name and
+ *                                                        optional attributes. Default empty array.
+ *     @type string|false $template_lock                  Whether the block template should be locked if $template is set.
+ *                                                        * If set to 'all', the user is unable to insert new blocks,
+ *                                                          move existing blocks and delete blocks.
+ *                                                       * If set to 'insert', the user is able to move existing blocks
+ *                                                         but is unable to insert new blocks and delete blocks.
+ *                                                         Default false.
+ *     @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 on success,
  *                               WP_Error object on failure.
@@ -1776,7 +1890,7 @@
 }
 
 /**
- * Build an object with all post type capabilities out of a post type object
+ * Builds an object with all post type capabilities out of a post type object
  *
  * Post type capabilities use the 'capability_type' argument as a base, if the
  * capability is not set in the 'capabilities' argument array or if the
@@ -1881,7 +1995,7 @@
 }
 
 /**
- * Store or return a list of post type meta caps for map_meta_cap().
+ * Stores or returns a list of post type meta caps for map_meta_cap().
  *
  * @since 3.1.0
  * @access private
@@ -1908,9 +2022,7 @@
  * - `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://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` - Label for adding a new item. Default is 'Add New Post' / 'Add New Page'.
  * - `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'.
@@ -1944,6 +2056,7 @@
  *                              Default is 'Post published privately.' / 'Page published privately.'
  * - `item_reverted_to_draft` - Label used when an item is switched to a draft.
  *                            Default is 'Post reverted to draft.' / 'Page reverted to draft.'
+ * - `item_trashed` - Label used when an item is moved to Trash. Default is 'Post trashed.' / 'Page trashed.'
  * - `item_scheduled` - Label used when an item is scheduled for publishing. Default is 'Post scheduled.' /
  *                    'Page scheduled.'
  * - `item_updated` - Label used when an item is updated. Default is 'Post updated.' / 'Page updated.'
@@ -1967,6 +2080,10 @@
  *              `item_scheduled`, and `item_updated` labels.
  * @since 5.7.0 Added the `filter_by_date` label.
  * @since 5.8.0 Added the `item_link` and `item_link_description` labels.
+ * @since 6.3.0 Added the `item_trashed` label.
+ * @since 6.4.0 Changed default values for the `add_new` label to include the type of content.
+ *              This matches `add_new_item` and provides more context for better accessibility.
+ * @since 6.6.0 Added the `template_name` label.
  *
  * @access private
  *
@@ -1980,6 +2097,11 @@
 
 	$labels = _get_custom_object_labels( $post_type_object, $nohier_vs_hier_defaults );
 
+	if ( ! isset( $post_type_object->labels->template_name ) && isset( $post_type_object->labels->singular_name ) ) {
+			/* translators: %s: Post type name. */
+			$labels->template_name = sprintf( __( 'Single item: %s' ), $post_type_object->labels->singular_name );
+	}
+
 	$post_type = $post_type_object->name;
 
 	$default_labels = clone $labels;
@@ -2011,55 +2133,59 @@
 }
 
 /**
- * Build an object with custom-something object (post type, taxonomy) labels
+ * Builds an object with custom-something object (post type, taxonomy) labels
  * out of a custom-something object
  *
  * @since 3.0.0
  * @access private
  *
- * @param object $object                  A custom-something object.
+ * @param object $data_object             A custom-something object.
  * @param array  $nohier_vs_hier_defaults Hierarchical vs non-hierarchical default labels.
  * @return object Object containing labels for the given custom-something object.
  */
-function _get_custom_object_labels( $object, $nohier_vs_hier_defaults ) {
-	$object->labels = (array) $object->labels;
-
-	if ( isset( $object->label ) && empty( $object->labels['name'] ) ) {
-		$object->labels['name'] = $object->label;
-	}
-
-	if ( ! isset( $object->labels['singular_name'] ) && isset( $object->labels['name'] ) ) {
-		$object->labels['singular_name'] = $object->labels['name'];
-	}
-
-	if ( ! isset( $object->labels['name_admin_bar'] ) ) {
-		$object->labels['name_admin_bar'] = isset( $object->labels['singular_name'] ) ? $object->labels['singular_name'] : $object->name;
-	}
-
-	if ( ! isset( $object->labels['menu_name'] ) && isset( $object->labels['name'] ) ) {
-		$object->labels['menu_name'] = $object->labels['name'];
-	}
-
-	if ( ! isset( $object->labels['all_items'] ) && isset( $object->labels['menu_name'] ) ) {
-		$object->labels['all_items'] = $object->labels['menu_name'];
-	}
-
-	if ( ! isset( $object->labels['archives'] ) && isset( $object->labels['all_items'] ) ) {
-		$object->labels['archives'] = $object->labels['all_items'];
+function _get_custom_object_labels( $data_object, $nohier_vs_hier_defaults ) {
+	$data_object->labels = (array) $data_object->labels;
+
+	if ( isset( $data_object->label ) && empty( $data_object->labels['name'] ) ) {
+		$data_object->labels['name'] = $data_object->label;
+	}
+
+	if ( ! isset( $data_object->labels['singular_name'] ) && isset( $data_object->labels['name'] ) ) {
+		$data_object->labels['singular_name'] = $data_object->labels['name'];
+	}
+
+	if ( ! isset( $data_object->labels['name_admin_bar'] ) ) {
+		$data_object->labels['name_admin_bar'] =
+			isset( $data_object->labels['singular_name'] )
+			? $data_object->labels['singular_name']
+			: $data_object->name;
+	}
+
+	if ( ! isset( $data_object->labels['menu_name'] ) && isset( $data_object->labels['name'] ) ) {
+		$data_object->labels['menu_name'] = $data_object->labels['name'];
+	}
+
+	if ( ! isset( $data_object->labels['all_items'] ) && isset( $data_object->labels['menu_name'] ) ) {
+		$data_object->labels['all_items'] = $data_object->labels['menu_name'];
+	}
+
+	if ( ! isset( $data_object->labels['archives'] ) && isset( $data_object->labels['all_items'] ) ) {
+		$data_object->labels['archives'] = $data_object->labels['all_items'];
 	}
 
 	$defaults = array();
 	foreach ( $nohier_vs_hier_defaults as $key => $value ) {
-		$defaults[ $key ] = $object->hierarchical ? $value[1] : $value[0];
-	}
-	$labels         = array_merge( $defaults, $object->labels );
-	$object->labels = (object) $object->labels;
+		$defaults[ $key ] = $data_object->hierarchical ? $value[1] : $value[0];
+	}
+
+	$labels              = array_merge( $defaults, $data_object->labels );
+	$data_object->labels = (object) $data_object->labels;
 
 	return (object) $labels;
 }
 
 /**
- * Add submenus for post types.
+ * Adds submenus for post types.
  *
  * @access private
  * @since 3.1.0
@@ -2084,7 +2210,8 @@
  * '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
+ * store revisions, the 'autosave' feature dictates whether the post type
+ * will be autosaved, 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
@@ -2125,7 +2252,7 @@
 }
 
 /**
- * Remove support for a feature from a post type.
+ * Removes support for a feature from a post type.
  *
  * @since 3.0.0
  *
@@ -2141,7 +2268,7 @@
 }
 
 /**
- * Get all the post type features
+ * Gets all the post type features
  *
  * @since 3.4.0
  *
@@ -2161,7 +2288,7 @@
 }
 
 /**
- * Check a post type's support for a given feature.
+ * Checks a post type's support for a given feature.
  *
  * @since 3.0.0
  *
@@ -2200,7 +2327,7 @@
 }
 
 /**
- * Update the post type for the post ID.
+ * Updates the post type for the post ID.
  *
  * The page or post cache will be cleaned for the post ID.
  *
@@ -2241,6 +2368,7 @@
 function is_post_type_viewable( $post_type ) {
 	if ( is_scalar( $post_type ) ) {
 		$post_type = get_post_type_object( $post_type );
+
 		if ( ! $post_type ) {
 			return false;
 		}
@@ -2270,7 +2398,7 @@
 }
 
 /**
- * Determine whether a post status is considered "viewable".
+ * Determines whether a post status is considered "viewable".
  *
  * For built-in post statuses such as publish and private, the 'public' value will be evaluated.
  * For all others, the 'publicly_queryable' value will be used.
@@ -2284,6 +2412,7 @@
 function is_post_status_viewable( $post_status ) {
 	if ( is_scalar( $post_status ) ) {
 		$post_status = get_post_status_object( $post_status );
+
 		if ( ! $post_status ) {
 			return false;
 		}
@@ -2317,7 +2446,7 @@
 }
 
 /**
- * Determine whether a post is publicly viewable.
+ * Determines whether a post is publicly viewable.
  *
  * Posts are considered publicly viewable if both the post status and post type
  * are viewable.
@@ -2406,9 +2535,8 @@
 	$parsed_args['ignore_sticky_posts'] = true;
 	$parsed_args['no_found_rows']       = true;
 
-	$get_posts = new WP_Query;
+	$get_posts = new WP_Query();
 	return $get_posts->query( $parsed_args );
-
 }
 
 //
@@ -2563,7 +2691,7 @@
 }
 
 /**
- * Retrieve post meta fields, based on post ID.
+ * Retrieves post meta fields, based on post ID.
  *
  * The post meta fields are retrieved from the cache where possible,
  * so the function is optimized to be called more than once.
@@ -2577,6 +2705,7 @@
  */
 function get_post_custom( $post_id = 0 ) {
 	$post_id = absint( $post_id );
+
 	if ( ! $post_id ) {
 		$post_id = get_the_ID();
 	}
@@ -2585,7 +2714,7 @@
 }
 
 /**
- * Retrieve meta field names for a post.
+ * Retrieves meta field names for a post.
  *
  * If there are no meta fields, then nothing (null) will be returned.
  *
@@ -2608,7 +2737,7 @@
 }
 
 /**
- * Retrieve values for a custom post field.
+ * Retrieves values for a custom post field.
  *
  * The parameters must not be considered optional. All of the post meta fields
  * will be retrieved and only the meta field key values returned.
@@ -2752,7 +2881,7 @@
 	}
 
 	$prefixed = false;
-	if ( false !== strpos( $field, 'post_' ) ) {
+	if ( str_contains( $field, 'post_' ) ) {
 		$prefixed        = true;
 		$field_no_prefix = str_replace( 'post_', '', $field );
 	}
@@ -2881,7 +3010,7 @@
 }
 
 /**
- * Make a post sticky.
+ * Makes a post sticky.
  *
  * Sticky posts should be displayed at the top of the front page.
  *
@@ -2918,7 +3047,7 @@
 }
 
 /**
- * Un-stick a post.
+ * Un-sticks a post.
  *
  * Sticky posts should be displayed at the top of the front page.
  *
@@ -2962,7 +3091,7 @@
 }
 
 /**
- * Return the cache key for wp_count_posts() based on the passed arguments.
+ * Returns the cache key for wp_count_posts() based on the passed arguments.
  *
  * @since 3.9.0
  * @access private
@@ -2986,7 +3115,7 @@
 }
 
 /**
- * Count number of posts of a post type and if user has permissions to view.
+ * Counts number of posts of a post type and if user has permissions to view.
  *
  * This function provides an efficient method of finding the amount of post's
  * type a blog has. Another method is to count the amount of items in
@@ -3002,13 +3131,14 @@
  *
  * @param string $type Optional. Post type to retrieve count. Default 'post'.
  * @param string $perm Optional. 'readable' or empty. Default empty.
- * @return stdClass Number of posts for each status.
+ * @return stdClass An object containing the number of posts for each status,
+ *                  or an empty object if the post type does not exist.
  */
 function wp_count_posts( $type = 'post', $perm = '' ) {
 	global $wpdb;
 
 	if ( ! post_type_exists( $type ) ) {
-		return new stdClass;
+		return new stdClass();
 	}
 
 	$cache_key = _count_posts_cache_key( $type, $perm );
@@ -3051,7 +3181,7 @@
 	wp_cache_set( $cache_key, $counts, 'counts' );
 
 	/**
-	 * Modify returned post counts by status for the current post type.
+	 * Filters the post counts by status for the current post type.
 	 *
 	 * @since 3.7.0
 	 *
@@ -3065,7 +3195,7 @@
 }
 
 /**
- * Count number of attachments for the mime type(s).
+ * Counts number of attachments for the mime type(s).
  *
  * If you set the optional mime_type parameter, then an array will still be
  * returned, but will only have the item you are looking for. It does not give
@@ -3083,17 +3213,27 @@
 function wp_count_attachments( $mime_type = '' ) {
 	global $wpdb;
 
-	$and   = wp_post_mime_type_where( $mime_type );
-	$count = $wpdb->get_results( "SELECT post_mime_type, COUNT( * ) AS num_posts FROM $wpdb->posts WHERE post_type = 'attachment' AND post_status != 'trash' $and GROUP BY post_mime_type", ARRAY_A );
-
-	$counts = array();
-	foreach ( (array) $count as $row ) {
-		$counts[ $row['post_mime_type'] ] = $row['num_posts'];
-	}
-	$counts['trash'] = $wpdb->get_var( "SELECT COUNT( * ) FROM $wpdb->posts WHERE post_type = 'attachment' AND post_status = 'trash' $and" );
+	$cache_key = sprintf(
+		'attachments%s',
+		! empty( $mime_type ) ? ':' . str_replace( '/', '_', implode( '-', (array) $mime_type ) ) : ''
+	);
+
+	$counts = wp_cache_get( $cache_key, 'counts' );
+	if ( false == $counts ) {
+		$and   = wp_post_mime_type_where( $mime_type );
+		$count = $wpdb->get_results( "SELECT post_mime_type, COUNT( * ) AS num_posts FROM $wpdb->posts WHERE post_type = 'attachment' AND post_status != 'trash' $and GROUP BY post_mime_type", ARRAY_A );
+
+		$counts = array();
+		foreach ( (array) $count as $row ) {
+			$counts[ $row['post_mime_type'] ] = $row['num_posts'];
+		}
+		$counts['trash'] = $wpdb->get_var( "SELECT COUNT( * ) FROM $wpdb->posts WHERE post_type = 'attachment' AND post_status = 'trash' $and" );
+
+		wp_cache_set( $cache_key, (object) $counts, 'counts' );
+	}
 
 	/**
-	 * Modify returned attachment counts by mime type.
+	 * Filters the attachment counts by mime type.
 	 *
 	 * @since 3.7.0
 	 *
@@ -3105,7 +3245,7 @@
 }
 
 /**
- * Get default post mime types.
+ * Gets default post mime types.
  *
  * @since 2.9.0
  * @since 5.3.0 Added the 'Documents', 'Spreadsheets', and 'Archives' mime type groups.
@@ -3209,16 +3349,16 @@
 }
 
 /**
- * Check a MIME-Type against a list.
- *
- * If the wildcard_mime_types parameter is a string, it must be comma separated
- * list. If the real_mime_types is a string, it is also comma separated to
+ * Checks a MIME-Type against a list.
+ *
+ * If the `$wildcard_mime_types` parameter is a string, it must be comma separated
+ * list. If the `$real_mime_types` is a string, it is also comma separated to
  * create the list.
  *
  * @since 2.5.0
  *
- * @param string|string[] $wildcard_mime_types Mime types, e.g. audio/mpeg or image (same as image/*)
- *                                             or flash (same as *flash*).
+ * @param string|string[] $wildcard_mime_types Mime types, e.g. `audio/mpeg`, `image` (same as `image/*`),
+ *                                             or `flash` (same as `*flash*`).
  * @param string|string[] $real_mime_types     Real post mime type values.
  * @return array array(wildcard=>array(real types)).
  */
@@ -3241,7 +3381,7 @@
 
 			$patternses[][ $type ] = "^$regex$";
 
-			if ( false === strpos( $mime, '/' ) ) {
+			if ( ! str_contains( $mime, '/' ) ) {
 				$patternses[][ $type ] = "^$regex/";
 				$patternses[][ $type ] = $regex;
 			}
@@ -3265,7 +3405,7 @@
 }
 
 /**
- * Convert MIME types into SQL.
+ * Converts MIME types into SQL.
  *
  * @since 2.5.0
  *
@@ -3282,7 +3422,7 @@
 		$post_mime_types = array_map( 'trim', explode( ',', $post_mime_types ) );
 	}
 
-	$wheres = array();
+	$where_clauses = array();
 
 	foreach ( (array) $post_mime_types as $mime_type ) {
 		$mime_type = preg_replace( '/\s/', '', $mime_type );
@@ -3298,7 +3438,7 @@
 			$mime_pattern = "$mime_group/$mime_subgroup";
 		} else {
 			$mime_pattern = preg_replace( '/[^-*.a-zA-Z0-9]/', '', $mime_type );
-			if ( false === strpos( $mime_pattern, '*' ) ) {
+			if ( ! str_contains( $mime_pattern, '*' ) ) {
 				$mime_pattern .= '/*';
 			}
 		}
@@ -3309,22 +3449,22 @@
 			return '';
 		}
 
-		if ( false !== strpos( $mime_pattern, '%' ) ) {
-			$wheres[] = empty( $table_alias ) ? "post_mime_type LIKE '$mime_pattern'" : "$table_alias.post_mime_type LIKE '$mime_pattern'";
+		if ( str_contains( $mime_pattern, '%' ) ) {
+			$where_clauses[] = 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 (' . implode( ' OR ', $wheres ) . ') ';
+			$where_clauses[] = empty( $table_alias ) ? "post_mime_type = '$mime_pattern'" : "$table_alias.post_mime_type = '$mime_pattern'";
+		}
+	}
+
+	if ( ! empty( $where_clauses ) ) {
+		$where = ' AND (' . implode( ' OR ', $where_clauses ) . ') ';
 	}
 
 	return $where;
 }
 
 /**
- * Trash or delete a post or page.
+ * Trashes or deletes 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
@@ -3339,15 +3479,15 @@
  * @see wp_delete_attachment()
  * @see wp_trash_post()
  *
- * @param int  $postid       Optional. Post ID. Default 0.
+ * @param int  $post_id      Optional. Post ID. Default 0.
  * @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 ) {
+function wp_delete_post( $post_id = 0, $force_delete = false ) {
 	global $wpdb;
 
-	$post = $wpdb->get_row( $wpdb->prepare( "SELECT * FROM $wpdb->posts WHERE ID = %d", $postid ) );
+	$post = $wpdb->get_row( $wpdb->prepare( "SELECT * FROM $wpdb->posts WHERE ID = %d", $post_id ) );
 
 	if ( ! $post ) {
 		return $post;
@@ -3355,12 +3495,15 @@
 
 	$post = get_post( $post );
 
-	if ( ! $force_delete && ( 'post' === $post->post_type || 'page' === $post->post_type ) && 'trash' !== get_post_status( $postid ) && EMPTY_TRASH_DAYS ) {
-		return wp_trash_post( $postid );
+	if ( ! $force_delete
+		&& ( 'post' === $post->post_type || 'page' === $post->post_type )
+		&& 'trash' !== get_post_status( $post_id ) && EMPTY_TRASH_DAYS
+	) {
+		return wp_trash_post( $post_id );
 	}
 
 	if ( 'attachment' === $post->post_type ) {
-		return wp_delete_attachment( $postid, $force_delete );
+		return wp_delete_attachment( $post_id, $force_delete );
 	}
 
 	/**
@@ -3368,7 +3511,7 @@
 	 *
 	 * @since 4.4.0
 	 *
-	 * @param WP_Post|false|null $delete       Whether to go forward with deletion. @TODO description
+	 * @param WP_Post|false|null $delete       Whether to go forward with deletion.
 	 * @param WP_Post            $post         Post object.
 	 * @param bool               $force_delete Whether to bypass the Trash.
 	 */
@@ -3385,30 +3528,39 @@
 	 *
 	 * @see wp_delete_post()
 	 *
-	 * @param int     $postid Post ID.
-	 * @param WP_Post $post   Post object.
+	 * @param int     $post_id Post ID.
+	 * @param WP_Post $post    Post object.
 	 */
-	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 ) );
+	do_action( 'before_delete_post', $post_id, $post );
+
+	delete_post_meta( $post_id, '_wp_trash_meta_status' );
+	delete_post_meta( $post_id, '_wp_trash_meta_time' );
+
+	wp_delete_object_term_relationships( $post_id, get_object_taxonomies( $post->post_type ) );
 
 	$parent_data  = array( 'post_parent' => $post->post_parent );
-	$parent_where = array( 'post_parent' => $postid );
+	$parent_where = array( 'post_parent' => $post_id );
 
 	if ( is_post_type_hierarchical( $post->post_type ) ) {
 		// Point children of this page to its parent, also clean the cache of affected children.
-		$children_query = $wpdb->prepare( "SELECT * FROM $wpdb->posts WHERE post_parent = %d AND post_type = %s", $postid, $post->post_type );
-		$children       = $wpdb->get_results( $children_query );
+		$children_query = $wpdb->prepare(
+			"SELECT * FROM $wpdb->posts WHERE post_parent = %d AND post_type = %s",
+			$post_id,
+			$post->post_type
+		);
+
+		$children = $wpdb->get_results( $children_query );
+
 		if ( $children ) {
 			$wpdb->update( $wpdb->posts, $parent_data, $parent_where + array( 'post_type' => $post->post_type ) );
 		}
 	}
 
 	// Do raw query. wp_get_post_revisions() is filtered.
-	$revision_ids = $wpdb->get_col( $wpdb->prepare( "SELECT ID FROM $wpdb->posts WHERE post_parent = %d AND post_type = 'revision'", $postid ) );
+	$revision_ids = $wpdb->get_col(
+		$wpdb->prepare( "SELECT ID FROM $wpdb->posts WHERE post_parent = %d AND post_type = 'revision'", $post_id )
+	);
+
 	// Use wp_delete_post (via wp_delete_post_revision) again. Ensures any meta/misplaced data gets cleaned up.
 	foreach ( $revision_ids as $revision_id ) {
 		wp_delete_post_revision( $revision_id );
@@ -3419,14 +3571,20 @@
 
 	wp_defer_comment_counting( true );
 
-	$comment_ids = $wpdb->get_col( $wpdb->prepare( "SELECT comment_ID FROM $wpdb->comments WHERE comment_post_ID = %d ORDER BY comment_ID DESC", $postid ) );
+	$comment_ids = $wpdb->get_col(
+		$wpdb->prepare( "SELECT comment_ID FROM $wpdb->comments WHERE comment_post_ID = %d ORDER BY comment_ID DESC", $post_id )
+	);
+
 	foreach ( $comment_ids as $comment_id ) {
 		wp_delete_comment( $comment_id, true );
 	}
 
 	wp_defer_comment_counting( false );
 
-	$post_meta_ids = $wpdb->get_col( $wpdb->prepare( "SELECT meta_id FROM $wpdb->postmeta WHERE post_id = %d ", $postid ) );
+	$post_meta_ids = $wpdb->get_col(
+		$wpdb->prepare( "SELECT meta_id FROM $wpdb->postmeta WHERE post_id = %d ", $post_id )
+	);
+
 	foreach ( $post_meta_ids as $mid ) {
 		delete_metadata_by_mid( 'post', $mid );
 	}
@@ -3434,15 +3592,28 @@
 	/**
 	 * Fires immediately before a post is deleted from the database.
 	 *
+	 * The dynamic portion of the hook name, `$post->post_type`, refers to
+	 * the post type slug.
+	 *
+	 * @since 6.6.0
+	 *
+	 * @param int     $post_id Post ID.
+	 * @param WP_Post $post    Post object.
+	 */
+	do_action( "delete_post_{$post->post_type}", $post_id, $post );
+
+	/**
+	 * Fires immediately before a post is deleted from the database.
+	 *
 	 * @since 1.2.0
 	 * @since 5.5.0 Added the `$post` parameter.
 	 *
-	 * @param int     $postid Post ID.
-	 * @param WP_Post $post   Post object.
+	 * @param int     $post_id Post ID.
+	 * @param WP_Post $post    Post object.
 	 */
-	do_action( 'delete_post', $postid, $post );
-
-	$result = $wpdb->delete( $wpdb->posts, array( 'ID' => $postid ) );
+	do_action( 'delete_post', $post_id, $post );
+
+	$result = $wpdb->delete( $wpdb->posts, array( 'ID' => $post_id ) );
 	if ( ! $result ) {
 		return false;
 	}
@@ -3450,13 +3621,26 @@
 	/**
 	 * Fires immediately after a post is deleted from the database.
 	 *
+	 * The dynamic portion of the hook name, `$post->post_type`, refers to
+	 * the post type slug.
+	 *
+	 * @since 6.6.0
+	 *
+	 * @param int     $post_id Post ID.
+	 * @param WP_Post $post    Post object.
+	 */
+	do_action( "deleted_post_{$post->post_type}", $post_id, $post );
+
+	/**
+	 * Fires immediately after a post is deleted from the database.
+	 *
 	 * @since 2.2.0
 	 * @since 5.5.0 Added the `$post` parameter.
 	 *
-	 * @param int     $postid Post ID.
-	 * @param WP_Post $post   Post object.
+	 * @param int     $post_id Post ID.
+	 * @param WP_Post $post    Post object.
 	 */
-	do_action( 'deleted_post', $postid, $post );
+	do_action( 'deleted_post', $post_id, $post );
 
 	clean_post_cache( $post );
 
@@ -3466,7 +3650,7 @@
 		}
 	}
 
-	wp_clear_scheduled_hook( 'publish_future_post', array( $postid ) );
+	wp_clear_scheduled_hook( 'publish_future_post', array( $post_id ) );
 
 	/**
 	 * Fires after a post is deleted, at the conclusion of wp_delete_post().
@@ -3476,16 +3660,16 @@
 	 *
 	 * @see wp_delete_post()
 	 *
-	 * @param int     $postid Post ID.
-	 * @param WP_Post $post   Post object.
+	 * @param int     $post_id Post ID.
+	 * @param WP_Post $post    Post object.
 	 */
-	do_action( 'after_delete_post', $postid, $post );
+	do_action( 'after_delete_post', $post_id, $post );
 
 	return $post;
 }
 
 /**
- * Reset the page_on_front, show_on_front, and page_for_post settings when
+ * Resets the page_on_front, show_on_front, and page_for_post settings when
  * a linked page is deleted or trashed.
  *
  * Also ensures the post is no longer sticky.
@@ -3516,7 +3700,7 @@
 }
 
 /**
- * Move a post or page to the Trash
+ * Moves a post or page to the Trash
  *
  * If Trash is disabled, the post or page is permanently deleted.
  *
@@ -3543,15 +3727,19 @@
 		return false;
 	}
 
+	$previous_status = $post->post_status;
+
 	/**
 	 * Filters whether a post trashing should take place.
 	 *
 	 * @since 4.9.0
-	 *
-	 * @param bool|null $trash Whether to go forward with trashing.
-	 * @param WP_Post   $post  Post object.
+	 * @since 6.3.0 Added the `$previous_status` parameter.
+	 *
+	 * @param bool|null $trash           Whether to go forward with trashing.
+	 * @param WP_Post   $post            Post object.
+	 * @param string    $previous_status The status of the post about to be trashed.
 	 */
-	$check = apply_filters( 'pre_trash_post', null, $post );
+	$check = apply_filters( 'pre_trash_post', null, $post, $previous_status );
 
 	if ( null !== $check ) {
 		return $check;
@@ -3561,12 +3749,14 @@
 	 * Fires before a post is sent to the Trash.
 	 *
 	 * @since 3.3.0
-	 *
-	 * @param int $post_id Post ID.
+	 * @since 6.3.0 Added the `$previous_status` parameter.
+	 *
+	 * @param int    $post_id         Post ID.
+	 * @param string $previous_status The status of the post about to be trashed.
 	 */
-	do_action( 'wp_trash_post', $post_id );
-
-	add_post_meta( $post_id, '_wp_trash_meta_status', $post->post_status );
+	do_action( 'wp_trash_post', $post_id, $previous_status );
+
+	add_post_meta( $post_id, '_wp_trash_meta_status', $previous_status );
 	add_post_meta( $post_id, '_wp_trash_meta_time', time() );
 
 	$post_updated = wp_update_post(
@@ -3586,10 +3776,12 @@
 	 * Fires after a post is sent to the Trash.
 	 *
 	 * @since 2.9.0
-	 *
-	 * @param int $post_id Post ID.
+	 * @since 6.3.0 Added the `$previous_status` parameter.
+	 *
+	 * @param int    $post_id         Post ID.
+	 * @param string $previous_status The status of the post at the point where it was trashed.
 	 */
-	do_action( 'trashed_post', $post_id );
+	do_action( 'trashed_post', $post_id, $previous_status );
 
 	return $post;
 }
@@ -3623,7 +3815,7 @@
 	 * Filters whether a post untrashing should take place.
 	 *
 	 * @since 4.9.0
-	 * @since 5.6.0 The `$previous_status` parameter was added.
+	 * @since 5.6.0 Added the `$previous_status` parameter.
 	 *
 	 * @param bool|null $untrash         Whether to go forward with untrashing.
 	 * @param WP_Post   $post            Post object.
@@ -3638,7 +3830,7 @@
 	 * Fires before a post is restored from the Trash.
 	 *
 	 * @since 2.9.0
-	 * @since 5.6.0 The `$previous_status` parameter was added.
+	 * @since 5.6.0 Added the `$previous_status` parameter.
 	 *
 	 * @param int    $post_id         Post ID.
 	 * @param string $previous_status The status of the post at the point where it was trashed.
@@ -3684,7 +3876,7 @@
 	 * Fires after a post is restored from the Trash.
 	 *
 	 * @since 2.9.0
-	 * @since 5.6.0 The `$previous_status` parameter was added.
+	 * @since 5.6.0 Added the `$previous_status` parameter.
 	 *
 	 * @param int    $post_id         Post ID.
 	 * @param string $previous_status The status of the post at the point where it was trashed.
@@ -3756,7 +3948,7 @@
 }
 
 /**
- * Restore comments for a post from the Trash.
+ * Restores comments for a post from the Trash.
  *
  * @since 2.9.0
  *
@@ -3798,7 +3990,7 @@
 	}
 
 	foreach ( $group_by_status as $status => $comments ) {
-		// Sanity check. This shouldn't happen.
+		// Confidence check. This shouldn't happen.
 		if ( 'post-trashed' === $status ) {
 			$status = '0';
 		}
@@ -3821,7 +4013,7 @@
 }
 
 /**
- * Retrieve the list of categories for a post.
+ * Retrieves the list of categories for a post.
  *
  * Compatibility layer for themes and plugins. Also an easy layer of abstraction
  * away from the complexity of the taxonomy layer.
@@ -3850,7 +4042,7 @@
 }
 
 /**
- * Retrieve the tags for a post.
+ * Retrieves the tags for a post.
  *
  * There is only one default for this function, called 'fields' and by default
  * is set to 'all'. There are other defaults that can be overridden in
@@ -3898,7 +4090,7 @@
 }
 
 /**
- * Retrieve a number of recent posts.
+ * Retrieves a number of recent posts.
  *
  * @since 1.0.0
  *
@@ -3947,11 +4139,10 @@
 	}
 
 	return $results ? $results : false;
-
-}
-
-/**
- * Insert or update a post.
+}
+
+/**
+ * Inserts or update a post.
  *
  * If the $postarr parameter has 'ID' set to a value, then post will be updated.
  *
@@ -3995,10 +4186,6 @@
  *                                         Default empty.
  *     @type string $pinged                Space or carriage return-separated list of URLs that have
  *                                         been pinged. Default empty.
- *     @type string $post_modified         The date when the post was last modified. Default is
- *                                         the current time.
- *     @type string $post_modified_gmt     The date when the post was last modified in the GMT
- *                                         timezone. Default is the current time.
  *     @type int    $post_parent           Set this for the post it belongs to, if any. Default 0.
  *     @type int    $menu_order            The order the post should be displayed in. Default 0.
  *     @type string $post_mime_type        The mime type of the post. Default empty.
@@ -4017,6 +4204,7 @@
  *                                         child terms can have the same names with different parent terms,
  *                                         so the only way to connect them is using ID. Default empty.
  *     @type array  $meta_input            Array of post meta values keyed by their post meta key. Default empty.
+ *     @type string $page_template         Page template to use.
  * }
  * @param bool  $wp_error         Optional. Whether to return a WP_Error on failure. Default false.
  * @param bool  $fire_after_hooks Optional. Whether to fire the after insert hooks. Default true.
@@ -4059,7 +4247,7 @@
 	$postarr = sanitize_post( $postarr, 'db' );
 
 	// Are we updating or creating?
-	$post_ID = 0;
+	$post_id = 0;
 	$update  = false;
 	$guid    = $postarr['guid'];
 
@@ -4067,8 +4255,8 @@
 		$update = true;
 
 		// Get the post ID and GUID.
-		$post_ID     = $postarr['ID'];
-		$post_before = get_post( $post_ID );
+		$post_id     = $postarr['ID'];
+		$post_before = get_post( $post_id );
 
 		if ( is_null( $post_before ) ) {
 			if ( $wp_error ) {
@@ -4077,8 +4265,8 @@
 			return 0;
 		}
 
-		$guid            = get_post_field( 'guid', $post_ID );
-		$previous_status = get_post_field( 'post_status', $post_ID );
+		$guid            = get_post_field( 'guid', $post_id );
+		$previous_status = get_post_field( 'post_status', $post_id );
 	} else {
 		$previous_status = 'new';
 		$post_before     = null;
@@ -4136,6 +4324,8 @@
 	if ( ! empty( $postarr['post_category'] ) ) {
 		// Filter out empty terms.
 		$post_category = array_filter( $postarr['post_category'] );
+	} elseif ( $update && ! isset( $postarr['post_category'] ) ) {
+		$post_category = $post_before->post_category;
 	}
 
 	// Make sure we set a valid category.
@@ -4153,12 +4343,14 @@
 	 *
 	 * For new posts check the primitive capability, for updates check the meta capability.
 	 */
-	$post_type_object = get_post_type_object( $post_type );
-
-	if ( ! $update && 'pending' === $post_status && ! current_user_can( $post_type_object->cap->publish_posts ) ) {
-		$post_name = '';
-	} elseif ( $update && 'pending' === $post_status && ! current_user_can( 'publish_post', $post_ID ) ) {
-		$post_name = '';
+	if ( 'pending' === $post_status ) {
+		$post_type_object = get_post_type_object( $post_type );
+
+		if ( ! $update && $post_type_object && ! current_user_can( $post_type_object->cap->publish_posts ) ) {
+			$post_name = '';
+		} elseif ( $update && ! current_user_can( 'publish_post', $post_id ) ) {
+			$post_name = '';
+		}
 	}
 
 	/*
@@ -4175,9 +4367,12 @@
 		// 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 ) {
+		if ( $update
+			&& strtolower( urlencode( $post_name ) ) === $check_name
+			&& get_post_field( 'post_name', $post_id ) === $check_name
+		) {
 			$post_name = $check_name;
-		} else { // new post, or slug has changed.
+		} else { // New post, or slug has changed.
 			$post_name = sanitize_title( $post_name );
 		}
 	}
@@ -4187,6 +4382,7 @@
 	 * if none are provided, the date will be set to now.
 	 */
 	$post_date = wp_resolve_post_date( $postarr['post_date'], $postarr['post_date_gmt'] );
+
 	if ( ! $post_date ) {
 		if ( $wp_error ) {
 			return new WP_Error( 'invalid_date', __( 'Invalid date.' ) );
@@ -4269,7 +4465,7 @@
 
 	$new_postarr = array_merge(
 		array(
-			'ID' => $post_ID,
+			'ID' => $post_id,
 		),
 		compact( array_diff( array_keys( $defaults ), array( 'context', 'filter' ) ) )
 	);
@@ -4280,21 +4476,21 @@
 	 * @since 3.1.0
 	 *
 	 * @param int   $post_parent Post parent ID.
-	 * @param int   $post_ID     Post ID.
+	 * @param int   $post_id     Post ID.
 	 * @param array $new_postarr Array of parsed post data.
 	 * @param array $postarr     Array of sanitized, but otherwise unmodified post data.
 	 */
-	$post_parent = apply_filters( 'wp_insert_post_parent', $post_parent, $post_ID, $new_postarr, $postarr );
+	$post_parent = apply_filters( 'wp_insert_post_parent', $post_parent, $post_id, $new_postarr, $postarr );
 
 	/*
 	 * If the post is being untrashed and it has a desired slug stored in post meta,
 	 * reassign it.
 	 */
 	if ( 'trash' === $previous_status && 'trash' !== $post_status ) {
-		$desired_post_slug = get_post_meta( $post_ID, '_wp_desired_post_slug', true );
+		$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' );
+			delete_post_meta( $post_id, '_wp_desired_post_slug' );
 			$post_name = $desired_post_slug;
 		}
 	}
@@ -4308,27 +4504,49 @@
 		 *
 		 * @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.
+		 * @param int    $post_id            Post ID.
 		 */
-		$add_trashed_suffix = apply_filters( 'add_trashed_suffix_to_trashed_posts', true, $post_name, $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 );
+			wp_add_trashed_suffix_to_post_name_for_trashed_posts( $post_name, $post_id );
 		}
 	}
 
 	// When trashing an existing post, change its slug to allow non-trashed posts to use it.
 	if ( 'trash' === $post_status && 'trash' !== $previous_status && 'new' !== $previous_status ) {
-		$post_name = wp_add_trashed_suffix_to_post_name_for_post( $post_ID );
-	}
-
-	$post_name = wp_unique_post_slug( $post_name, $post_ID, $post_status, $post_type, $post_parent );
+		$post_name = wp_add_trashed_suffix_to_post_name_for_post( $post_id );
+	}
+
+	$post_name = wp_unique_post_slug( $post_name, $post_id, $post_status, $post_type, $post_parent );
 
 	// Don't unslash.
 	$post_mime_type = isset( $postarr['post_mime_type'] ) ? $postarr['post_mime_type'] : '';
 
 	// Expected_slashed (everything!).
-	$data = compact( 'post_author', 'post_date', 'post_date_gmt', 'post_content', 'post_content_filtered', 'post_title', 'post_excerpt', 'post_status', 'post_type', 'comment_status', 'ping_status', 'post_password', 'post_name', 'to_ping', 'pinged', 'post_modified', 'post_modified_gmt', 'post_parent', 'menu_order', 'post_mime_type', 'guid' );
+	$data = compact(
+		'post_author',
+		'post_date',
+		'post_date_gmt',
+		'post_content',
+		'post_content_filtered',
+		'post_title',
+		'post_excerpt',
+		'post_status',
+		'post_type',
+		'comment_status',
+		'ping_status',
+		'post_password',
+		'post_name',
+		'to_ping',
+		'pinged',
+		'post_modified',
+		'post_modified_gmt',
+		'post_parent',
+		'menu_order',
+		'post_mime_type',
+		'guid'
+	);
 
 	$emoji_fields = array( 'post_title', 'post_content', 'post_excerpt' );
 
@@ -4375,7 +4593,7 @@
 	}
 
 	$data  = wp_unslash( $data );
-	$where = array( 'ID' => $post_ID );
+	$where = array( 'ID' => $post_id );
 
 	if ( $update ) {
 		/**
@@ -4383,10 +4601,10 @@
 		 *
 		 * @since 2.5.0
 		 *
-		 * @param int   $post_ID Post ID.
+		 * @param int   $post_id Post ID.
 		 * @param array $data    Array of unslashed post data.
 		 */
-		do_action( 'pre_post_update', $post_ID, $data );
+		do_action( 'pre_post_update', $post_id, $data );
 
 		if ( false === $wpdb->update( $wpdb->posts, $data, $where ) ) {
 			if ( $wp_error ) {
@@ -4425,25 +4643,25 @@
 			}
 		}
 
-		$post_ID = (int) $wpdb->insert_id;
-
-		// Use the newly generated $post_ID.
-		$where = array( 'ID' => $post_ID );
+		$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' ), true ) ) {
-		$data['post_name'] = wp_unique_post_slug( sanitize_title( $data['post_title'], $post_ID ), $post_ID, $data['post_status'], $post_type, $post_parent );
+		$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 );
+		clean_post_cache( $post_id );
 	}
 
 	if ( is_object_in_taxonomy( $post_type, 'category' ) ) {
-		wp_set_post_categories( $post_ID, $post_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'] );
+		wp_set_post_tags( $post_id, $postarr['tags_input'] );
 	}
 
 	// Add default term for all associated custom taxonomies.
@@ -4458,7 +4676,7 @@
 				}
 
 				// Passed custom taxonomy list overwrites the existing list if not empty.
-				$terms = wp_get_object_terms( $post_ID, $taxonomy, array( 'fields' => 'ids' ) );
+				$terms = wp_get_object_terms( $post_id, $taxonomy, array( 'fields' => 'ids' ) );
 				if ( ! empty( $terms ) && empty( $postarr['tax_input'][ $taxonomy ] ) ) {
 					$postarr['tax_input'][ $taxonomy ] = $terms;
 				}
@@ -4490,31 +4708,31 @@
 			}
 
 			if ( current_user_can( $taxonomy_obj->cap->assign_terms ) ) {
-				wp_set_post_terms( $post_ID, $tags, $taxonomy );
+				wp_set_post_terms( $post_id, $tags, $taxonomy );
 			}
 		}
 	}
 
 	if ( ! empty( $postarr['meta_input'] ) ) {
 		foreach ( $postarr['meta_input'] as $field => $value ) {
-			update_post_meta( $post_ID, $field, $value );
-		}
-	}
-
-	$current_guid = get_post_field( 'guid', $post_ID );
+			update_post_meta( $post_id, $field, $value );
+		}
+	}
+
+	$current_guid = get_post_field( 'guid', $post_id );
 
 	// Set GUID.
 	if ( ! $update && '' === $current_guid ) {
-		$wpdb->update( $wpdb->posts, array( 'guid' => get_permalink( $post_ID ) ), $where );
+		$wpdb->update( $wpdb->posts, array( 'guid' => get_permalink( $post_id ) ), $where );
 	}
 
 	if ( 'attachment' === $postarr['post_type'] ) {
 		if ( ! empty( $postarr['file'] ) ) {
-			update_attached_file( $post_ID, $postarr['file'] );
+			update_attached_file( $post_id, $postarr['file'] );
 		}
 
 		if ( ! empty( $postarr['context'] ) ) {
-			add_post_meta( $post_ID, '_wp_attachment_context', $postarr['context'], true );
+			add_post_meta( $post_id, '_wp_attachment_context', $postarr['context'], true );
 		}
 	}
 
@@ -4523,9 +4741,9 @@
 		$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 ) ) {
+			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 ) ) {
+			} elseif ( wp_attachment_is( 'video', $post_id ) ) {
 				$thumbnail_support = post_type_supports( 'attachment:video', 'thumbnail' ) || current_theme_supports( 'post-thumbnails', 'attachment:video' );
 			}
 		}
@@ -4533,16 +4751,16 @@
 		if ( $thumbnail_support ) {
 			$thumbnail_id = (int) $postarr['_thumbnail_id'];
 			if ( -1 === $thumbnail_id ) {
-				delete_post_thumbnail( $post_ID );
+				delete_post_thumbnail( $post_id );
 			} else {
-				set_post_thumbnail( $post_ID, $thumbnail_id );
+				set_post_thumbnail( $post_id, $thumbnail_id );
 			}
 		}
 	}
 
-	clean_post_cache( $post_ID );
-
-	$post = get_post( $post_ID );
+	clean_post_cache( $post_id );
+
+	$post = get_post( $post_id );
 
 	if ( ! empty( $postarr['page_template'] ) ) {
 		$post->page_template = $postarr['page_template'];
@@ -4553,9 +4771,9 @@
 				return new WP_Error( 'invalid_page_template', __( 'Invalid page template.' ) );
 			}
 
-			update_post_meta( $post_ID, '_wp_page_template', 'default' );
+			update_post_meta( $post_id, '_wp_page_template', 'default' );
 		} else {
-			update_post_meta( $post_ID, '_wp_page_template', $postarr['page_template'] );
+			update_post_meta( $post_id, '_wp_page_template', $postarr['page_template'] );
 		}
 	}
 
@@ -4568,22 +4786,22 @@
 			 *
 			 * @since 2.0.0
 			 *
-			 * @param int $post_ID Attachment ID.
+			 * @param int $post_id Attachment ID.
 			 */
-			do_action( 'edit_attachment', $post_ID );
-
-			$post_after = get_post( $post_ID );
+			do_action( 'edit_attachment', $post_id );
+
+			$post_after = get_post( $post_id );
 
 			/**
 			 * Fires once an existing attachment has been updated.
 			 *
 			 * @since 4.4.0
 			 *
-			 * @param int     $post_ID      Post ID.
+			 * @param int     $post_id      Post ID.
 			 * @param WP_Post $post_after   Post object following the update.
 			 * @param WP_Post $post_before  Post object before the update.
 			 */
-			do_action( 'attachment_updated', $post_ID, $post_after, $post_before );
+			do_action( 'attachment_updated', $post_id, $post_after, $post_before );
 		} else {
 
 			/**
@@ -4591,12 +4809,12 @@
 			 *
 			 * @since 2.0.0
 			 *
-			 * @param int $post_ID Attachment ID.
+			 * @param int $post_id Attachment ID.
 			 */
-			do_action( 'add_attachment', $post_ID );
-		}
-
-		return $post_ID;
+			do_action( 'add_attachment', $post_id );
+		}
+
+		return $post_id;
 	}
 
 	if ( $update ) {
@@ -4613,33 +4831,33 @@
 		 *
 		 * @since 5.1.0
 		 *
-		 * @param int     $post_ID Post ID.
+		 * @param int     $post_id Post ID.
 		 * @param WP_Post $post    Post object.
 		 */
-		do_action( "edit_post_{$post->post_type}", $post_ID, $post );
+		do_action( "edit_post_{$post->post_type}", $post_id, $post );
 
 		/**
 		 * Fires once an existing post has been updated.
 		 *
 		 * @since 1.2.0
 		 *
-		 * @param int     $post_ID Post ID.
+		 * @param int     $post_id Post ID.
 		 * @param WP_Post $post    Post object.
 		 */
-		do_action( 'edit_post', $post_ID, $post );
-
-		$post_after = get_post( $post_ID );
+		do_action( 'edit_post', $post_id, $post );
+
+		$post_after = get_post( $post_id );
 
 		/**
 		 * Fires once an existing post has been updated.
 		 *
 		 * @since 3.0.0
 		 *
-		 * @param int     $post_ID      Post ID.
+		 * @param int     $post_id      Post ID.
 		 * @param WP_Post $post_after   Post object following the update.
 		 * @param WP_Post $post_before  Post object before the update.
 		 */
-		do_action( 'post_updated', $post_ID, $post_after, $post_before );
+		do_action( 'post_updated', $post_id, $post_after, $post_before );
 	}
 
 	/**
@@ -4655,43 +4873,43 @@
 	 *
 	 * @since 3.7.0
 	 *
-	 * @param int     $post_ID Post ID.
+	 * @param int     $post_id Post ID.
 	 * @param WP_Post $post    Post object.
 	 * @param bool    $update  Whether this is an existing post being updated.
 	 */
-	do_action( "save_post_{$post->post_type}", $post_ID, $post, $update );
+	do_action( "save_post_{$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 int     $post_id Post ID.
 	 * @param WP_Post $post    Post object.
 	 * @param bool    $update  Whether this is an existing post being updated.
 	 */
-	do_action( 'save_post', $post_ID, $post, $update );
+	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 int     $post_id Post ID.
 	 * @param WP_Post $post    Post object.
 	 * @param bool    $update  Whether this is an existing post being updated.
 	 */
-	do_action( 'wp_insert_post', $post_ID, $post, $update );
+	do_action( 'wp_insert_post', $post_id, $post, $update );
 
 	if ( $fire_after_hooks ) {
 		wp_after_insert_post( $post, $update, $post_before );
 	}
 
-	return $post_ID;
-}
-
-/**
- * Update a post with new post data.
+	return $post_id;
+}
+
+/**
+ * Updates a post with new post data.
  *
  * The date does not have to be set for drafts. You can set the date and it will
  * not be overridden.
@@ -4776,7 +4994,7 @@
 }
 
 /**
- * Publish a post by transitioning the post status.
+ * Publishes a post by transitioning the post status.
  *
  * @since 2.1.0
  *
@@ -4853,17 +5071,17 @@
 }
 
 /**
- * Publish future post and make sure post ID has future post status.
+ * Publishes future post and make sure post ID has future post status.
  *
  * Invoked by cron 'publish_future_post' event. This safeguard prevents cron
  * from publishing drafts, etc.
  *
  * @since 2.5.0
  *
- * @param int|WP_Post $post_id Post ID or post object.
- */
-function check_and_publish_future_post( $post_id ) {
-	$post = get_post( $post_id );
+ * @param int|WP_Post $post Post ID or post object.
+ */
+function check_and_publish_future_post( $post ) {
+	$post = get_post( $post );
 
 	if ( ! $post ) {
 		return;
@@ -4877,13 +5095,13 @@
 
 	// Uh oh, someone jumped the gun!
 	if ( $time > time() ) {
-		wp_clear_scheduled_hook( 'publish_future_post', array( $post_id ) ); // Clear anything else in the system.
-		wp_schedule_single_event( $time, 'publish_future_post', array( $post_id ) );
+		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.
-	wp_publish_post( $post_id );
+	wp_publish_post( $post->ID );
 }
 
 /**
@@ -4896,8 +5114,8 @@
  *
  * @since 5.7.0
  *
- * @param string $post_date     The date in mysql format.
- * @param string $post_date_gmt The GMT date in mysql format.
+ * @param string $post_date     The date in mysql format (`Y-m-d H:i:s`).
+ * @param string $post_date_gmt The GMT date in mysql format (`Y-m-d H:i:s`).
  * @return string|false A valid Gregorian-calendar date string, or false on failure.
  */
 function wp_resolve_post_date( $post_date = '', $post_date_gmt = '' ) {
@@ -4911,9 +5129,9 @@
 	}
 
 	// Validate the date.
-	$month = substr( $post_date, 5, 2 );
-	$day   = substr( $post_date, 8, 2 );
-	$year  = substr( $post_date, 0, 4 );
+	$month = (int) substr( $post_date, 5, 2 );
+	$day   = (int) substr( $post_date, 8, 2 );
+	$year  = (int) substr( $post_date, 0, 4 );
 
 	$valid_date = wp_checkdate( $month, $day, $year, $post_date );
 
@@ -4932,13 +5150,13 @@
  * @global WP_Rewrite $wp_rewrite WordPress rewrite component.
  *
  * @param string $slug        The desired slug (post_name).
- * @param int    $post_ID     Post ID.
+ * @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 ) {
+function wp_unique_post_slug( $slug, $post_id, $post_status, $post_type, $post_parent ) {
 	if ( in_array( $post_status, array( 'draft', 'pending', 'auto-draft' ), true )
 		|| ( 'inherit' === $post_status && 'revision' === $post_type ) || 'user_request' === $post_type
 	) {
@@ -4955,12 +5173,12 @@
 	 *
 	 * @param string|null $override_slug Short-circuit return value.
 	 * @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_type     Post type.
 	 * @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 );
+	$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;
 	}
@@ -4977,7 +5195,7 @@
 	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 ) );
+		$post_name_check = $wpdb->get_var( $wpdb->prepare( $check_sql, $slug, $post_id ) );
 
 		/**
 		 * Filters whether the post slug would make a bad attachment slug.
@@ -4996,8 +5214,8 @@
 			$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++;
+				$post_name_check = $wpdb->get_var( $wpdb->prepare( $check_sql, $alt_post_name, $post_id ) );
+				++$suffix;
 			} while ( $post_name_check );
 			$slug = $alt_post_name;
 		}
@@ -5011,7 +5229,7 @@
 		 * namespace than posts so page slugs are allowed to overlap post slugs.
 		 */
 		$check_sql       = "SELECT post_name FROM $wpdb->posts WHERE post_name = %s AND post_type IN ( %s, 'attachment' ) AND ID != %d AND post_parent = %d LIMIT 1";
-		$post_name_check = $wpdb->get_var( $wpdb->prepare( $check_sql, $slug, $post_type, $post_ID, $post_parent ) );
+		$post_name_check = $wpdb->get_var( $wpdb->prepare( $check_sql, $slug, $post_type, $post_id, $post_parent ) );
 
 		/**
 		 * Filters whether the post slug would make a bad hierarchical post slug.
@@ -5033,17 +5251,17 @@
 			$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++;
+				$post_name_check = $wpdb->get_var( $wpdb->prepare( $check_sql, $alt_post_name, $post_type, $post_id, $post_parent ) );
+				++$suffix;
 			} while ( $post_name_check );
 			$slug = $alt_post_name;
 		}
 	} else {
 		// Post slugs must be unique across all posts.
 		$check_sql       = "SELECT post_name FROM $wpdb->posts WHERE post_name = %s AND post_type = %s AND ID != %d LIMIT 1";
-		$post_name_check = $wpdb->get_var( $wpdb->prepare( $check_sql, $slug, $post_type, $post_ID ) );
-
-		$post = get_post( $post_ID );
+		$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.
 		$conflicts_with_date_archive = false;
@@ -5089,8 +5307,8 @@
 			$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++;
+				$post_name_check = $wpdb->get_var( $wpdb->prepare( $check_sql, $alt_post_name, $post_type, $post_id ) );
+				++$suffix;
 			} while ( $post_name_check );
 			$slug = $alt_post_name;
 		}
@@ -5102,17 +5320,17 @@
 	 * @since 3.3.0
 	 *
 	 * @param string $slug          The post slug.
-	 * @param int    $post_ID       Post ID.
+	 * @param int    $post_id       Post ID.
 	 * @param string $post_status   The post status.
 	 * @param string $post_type     Post type.
 	 * @param int    $post_parent   Post parent ID
 	 * @param string $original_slug The original post slug.
 	 */
-	return apply_filters( 'wp_unique_post_slug', $slug, $post_ID, $post_status, $post_type, $post_parent, $original_slug );
-}
-
-/**
- * Truncate a post slug.
+	return apply_filters( 'wp_unique_post_slug', $slug, $post_id, $post_status, $post_type, $post_parent, $original_slug );
+}
+
+/**
+ * Truncates a post slug.
  *
  * @since 3.6.0
  * @access private
@@ -5137,7 +5355,7 @@
 }
 
 /**
- * Add tags to a post.
+ * Adds tags to a post.
  *
  * @see wp_set_post_tags()
  *
@@ -5153,7 +5371,7 @@
 }
 
 /**
- * Set the tags for a post.
+ * Sets the tags for a post.
  *
  * @since 2.3.0
  *
@@ -5171,14 +5389,14 @@
 }
 
 /**
- * Set the terms for a post.
+ * Sets the terms for a post.
  *
  * @since 2.8.0
  *
  * @see wp_set_object_terms()
  *
  * @param int          $post_id  Optional. The Post ID. Does not default to the ID of the global $post.
- * @param string|array $tags     Optional. An array of terms to set for the post, or a string of terms
+ * @param string|array $terms    Optional. An array of terms to set for the post, or a string of terms
  *                               separated by commas. Hierarchical taxonomies must always pass IDs rather
  *                               than names so that children with the same names but different parents
  *                               aren't confused. Default empty.
@@ -5187,23 +5405,23 @@
  *                               replace the terms with the new terms. Default false.
  * @return array|false|WP_Error Array of term taxonomy IDs of affected terms. WP_Error or false on failure.
  */
-function wp_set_post_terms( $post_id = 0, $tags = '', $taxonomy = 'post_tag', $append = false ) {
+function wp_set_post_terms( $post_id = 0, $terms = '', $taxonomy = 'post_tag', $append = false ) {
 	$post_id = (int) $post_id;
 
 	if ( ! $post_id ) {
 		return false;
 	}
 
-	if ( empty( $tags ) ) {
-		$tags = array();
-	}
-
-	if ( ! is_array( $tags ) ) {
+	if ( empty( $terms ) ) {
+		$terms = array();
+	}
+
+	if ( ! is_array( $terms ) ) {
 		$comma = _x( ',', 'tag delimiter' );
 		if ( ',' !== $comma ) {
-			$tags = str_replace( $comma, ',', $tags );
-		}
-		$tags = explode( ',', trim( $tags, " \n\t\r\0\x0B," ) );
+			$terms = str_replace( $comma, ',', $terms );
+		}
+		$terms = explode( ',', trim( $terms, " \n\t\r\0\x0B," ) );
 	}
 
 	/*
@@ -5211,20 +5429,20 @@
 	 * children with the same names but different parents aren't confused.
 	 */
 	if ( is_taxonomy_hierarchical( $taxonomy ) ) {
-		$tags = array_unique( array_map( 'intval', $tags ) );
-	}
-
-	return wp_set_object_terms( $post_id, $tags, $taxonomy, $append );
-}
-
-/**
- * Set categories for a post.
+		$terms = array_unique( array_map( 'intval', $terms ) );
+	}
+
+	return wp_set_object_terms( $post_id, $terms, $taxonomy, $append );
+}
+
+/**
+ * Sets categories for a post.
  *
  * If no categories are provided, the default category is used.
  *
  * @since 2.1.0
  *
- * @param int       $post_ID         Optional. The Post ID. Does not default to the ID
+ * @param int       $post_id         Optional. The Post ID. Does not default to the ID
  *                                   of the global $post. Default 0.
  * @param int[]|int $post_categories Optional. List of category IDs, or the ID of a single category.
  *                                   Default empty array.
@@ -5232,10 +5450,10 @@
  *                                   If false, replace the categories with the new categories.
  * @return array|false|WP_Error Array of term taxonomy IDs of affected categories. WP_Error or false on failure.
  */
-function wp_set_post_categories( $post_ID = 0, $post_categories = array(), $append = false ) {
-	$post_ID     = (int) $post_ID;
-	$post_type   = get_post_type( $post_ID );
-	$post_status = get_post_status( $post_ID );
+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.
 	$post_categories = (array) $post_categories;
@@ -5266,7 +5484,7 @@
 		return true;
 	}
 
-	return wp_set_post_terms( $post_ID, $post_categories, 'category', $append );
+	return wp_set_post_terms( $post_id, $post_categories, 'category', $append );
 }
 
 /**
@@ -5373,6 +5591,7 @@
  */
 function wp_after_insert_post( $post, $update, $post_before ) {
 	$post = get_post( $post );
+
 	if ( ! $post ) {
 		return;
 	}
@@ -5398,22 +5617,22 @@
 //
 
 /**
- * Add a URL to those already pinged.
+ * Adds a URL to those already pinged.
  *
  * @since 1.5.0
- * @since 4.7.0 `$post_id` can be a WP_Post object.
+ * @since 4.7.0 `$post` can be a WP_Post object.
  * @since 4.7.0 `$uri` can be an array of URIs.
  *
  * @global wpdb $wpdb WordPress database abstraction object.
  *
- * @param int|WP_Post  $post_id Post object or ID.
- * @param string|array $uri     Ping URI or array of URIs.
+ * @param int|WP_Post  $post Post ID or post object.
+ * @param string|array $uri  Ping URI or array of URIs.
  * @return int|false How many rows were updated.
  */
-function add_ping( $post_id, $uri ) {
+function add_ping( $post, $uri ) {
 	global $wpdb;
 
-	$post = get_post( $post_id );
+	$post = get_post( $post );
 
 	if ( ! $post ) {
 		return false;
@@ -5444,7 +5663,7 @@
 }
 
 /**
- * Retrieve enclosures already enclosed for a post.
+ * Retrieves enclosures already enclosed for a post.
  *
  * @since 1.5.0
  *
@@ -5480,17 +5699,17 @@
 }
 
 /**
- * Retrieve URLs already pinged for a post.
+ * Retrieves URLs already pinged for a post.
  *
  * @since 1.5.0
  *
- * @since 4.7.0 `$post_id` can be a WP_Post object.
- *
- * @param int|WP_Post $post_id Post ID or object.
+ * @since 4.7.0 `$post` can be a WP_Post object.
+ *
+ * @param int|WP_Post $post Post ID or object.
  * @return string[]|false Array of URLs already pinged for the given post, false if the post is not found.
  */
-function get_pung( $post_id ) {
-	$post = get_post( $post_id );
+function get_pung( $post ) {
+	$post = get_post( $post );
 
 	if ( ! $post ) {
 		return false;
@@ -5510,16 +5729,16 @@
 }
 
 /**
- * Retrieve URLs that need to be pinged.
+ * Retrieves URLs that need to be pinged.
  *
  * @since 1.5.0
- * @since 4.7.0 `$post_id` can be a WP_Post object.
- *
- * @param int|WP_Post $post_id Post Object or ID
+ * @since 4.7.0 `$post` can be a WP_Post object.
+ *
+ * @param int|WP_Post $post Post ID or post object.
  * @return string[]|false List of URLs yet to ping.
  */
-function get_to_ping( $post_id ) {
-	$post = get_post( $post_id );
+function get_to_ping( $post ) {
+	$post = get_post( $post );
 
 	if ( ! $post ) {
 		return false;
@@ -5539,7 +5758,7 @@
 }
 
 /**
- * Do trackbacks for a list of URLs.
+ * Does trackbacks for a list of URLs.
  *
  * @since 1.0.0
  *
@@ -5571,7 +5790,7 @@
 //
 
 /**
- * Get a list of page IDs.
+ * Gets a list of page IDs.
  *
  * @since 2.0.0
  *
@@ -5632,7 +5851,7 @@
 
 	$hash      = md5( $page_path . serialize( $post_type ) );
 	$cache_key = "get_page_by_path:$hash:$last_changed";
-	$cached    = wp_cache_get( $cache_key, 'posts' );
+	$cached    = wp_cache_get( $cache_key, 'post-queries' );
 	if ( false !== $cached ) {
 		// Special case: '0' is a bad `$page_path`.
 		if ( '0' === $cached || 0 === $cached ) {
@@ -5681,7 +5900,7 @@
 			 * ensuring each matches the post ancestry.
 			 */
 			while ( 0 != $p->post_parent && isset( $pages[ $p->post_parent ] ) ) {
-				$count++;
+				++$count;
 				$parent = $pages[ $p->post_parent ];
 				if ( ! isset( $revparts[ $count ] ) || $parent->post_name != $revparts[ $count ] ) {
 					break;
@@ -5689,7 +5908,7 @@
 				$p = $parent;
 			}
 
-			if ( 0 == $p->post_parent && count( $revparts ) == $count + 1 && $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;
@@ -5699,7 +5918,7 @@
 	}
 
 	// We cache misses as well as hits.
-	wp_cache_set( $cache_key, $foundid, 'posts' );
+	wp_cache_set( $cache_key, $foundid, 'post-queries' );
 
 	if ( $foundid ) {
 		return get_post( $foundid, $output );
@@ -5709,74 +5928,15 @@
 }
 
 /**
- * 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       $output     Optional. The required return type. One of OBJECT, ARRAY_A, or ARRAY_N, which
- *                                 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;
-
-	if ( is_array( $post_type ) ) {
-		$post_type           = esc_sql( $post_type );
-		$post_type_in_string = "'" . implode( "','", $post_type ) . "'";
-		$sql                 = $wpdb->prepare(
-			"
-			SELECT ID
-			FROM $wpdb->posts
-			WHERE post_title = %s
-			AND post_type IN ($post_type_in_string)
-		",
-			$page_title
-		);
-	} else {
-		$sql = $wpdb->prepare(
-			"
-			SELECT ID
-			FROM $wpdb->posts
-			WHERE post_title = %s
-			AND post_type = %s
-		",
-			$page_title,
-			$post_type
-		);
-	}
-
-	$page = $wpdb->get_var( $sql );
-
-	if ( $page ) {
-		return get_post( $page, $output );
-	}
-
-	return null;
-}
-
-/**
- * Identify descendants of a given page ID in a list of page objects.
+ * Identifies descendants of a given page ID in a list of page objects.
  *
  * Descendants are identified from the `$pages` array passed to the function. No database queries are performed.
  *
  * @since 1.5.1
  *
- * @param int   $page_id Page ID.
- * @param array $pages   List of page objects from which descendants should be identified.
- * @return array List of page children.
+ * @param int       $page_id Page ID.
+ * @param WP_Post[] $pages   List of page objects from which descendants should be identified.
+ * @return WP_Post[] List of page children.
  */
 function get_page_children( $page_id, $pages ) {
 	// Build a hash of ID -> children.
@@ -5808,7 +5968,7 @@
 }
 
 /**
- * Order the pages with children under parents in a flat list.
+ * Orders the pages with children under parents in a flat list.
  *
  * It uses auxiliary structure to hold parent-children relationships and
  * runs in O(N) complexity
@@ -5837,7 +5997,7 @@
 }
 
 /**
- * Traverse and return all the nested children post names of a root page.
+ * Traverses and return all the nested children post names of a root page.
  *
  * $children contains parent-children relations
  *
@@ -5860,7 +6020,7 @@
 }
 
 /**
- * Build the URI path for a page.
+ * Builds the URI path for a page.
  *
  * Sub pages will be in the "directory" under the parent page post name.
  *
@@ -5900,11 +6060,10 @@
 }
 
 /**
- * Retrieve an array of pages (or hierarchical post type items).
- *
- * @global wpdb $wpdb WordPress database abstraction object.
+ * Retrieves an array of pages (or hierarchical post type items).
  *
  * @since 1.5.0
+ * @since 6.3.0 Use WP_Query internally.
  *
  * @param array|string $args {
  *     Optional. Array or string of arguments to retrieve pages.
@@ -5939,13 +6098,11 @@
  *     @type string|array $post_status  A comma-separated list or array of post statuses to include.
  *                                      Default 'publish'.
  * }
- * @return WP_Post[]|int[]|false Array of pages (or hierarchical post type items). Boolean false if the
- *                               specified post type is not hierarchical or the specified status is not
- *                               supported by the post type.
+ * @return WP_Post[]|false Array of pages (or hierarchical post type items). Boolean false if the
+ *                         specified post type is not hierarchical or the specified status is not
+ *                         supported by the post type.
  */
 function get_pages( $args = array() ) {
-	global $wpdb;
-
 	$defaults = array(
 		'child_of'     => 0,
 		'sort_order'   => 'ASC',
@@ -5994,50 +6151,35 @@
 		return false;
 	}
 
-	// $args can be whatever, only use the args defined in defaults to compute the key.
-	$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 ) {
-		_prime_post_caches( $cache, false, false );
-
-		// 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, $parsed_args );
-
-		return $pages;
-	}
-
-	$inclusions = '';
+	$query_args = array(
+		'orderby'                => 'post_title',
+		'order'                  => 'ASC',
+		'post__not_in'           => wp_parse_id_list( $exclude ),
+		'meta_key'               => $meta_key,
+		'meta_value'             => $meta_value,
+		'posts_per_page'         => -1,
+		'offset'                 => $offset,
+		'post_type'              => $parsed_args['post_type'],
+		'post_status'            => $post_status,
+		'update_post_term_cache' => false,
+		'update_post_meta_cache' => false,
+		'ignore_sticky_posts'    => true,
+		'no_found_rows'          => true,
+	);
+
 	if ( ! empty( $parsed_args['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( $parsed_args['include'] );
-		if ( ! empty( $incpages ) ) {
-			$inclusions = ' AND ID IN (' . implode( ',', $incpages ) . ')';
-		}
-	}
-
-	$exclusions = '';
-	if ( ! empty( $exclude ) ) {
-		$expages = wp_parse_id_list( $exclude );
-		if ( ! empty( $expages ) ) {
-			$exclusions = ' AND ID NOT IN (' . implode( ',', $expages ) . ')';
-		}
-	}
-
-	$author_query = '';
+		$child_of = 0; // Ignore child_of, parent, exclude, meta_key, and meta_value params if using include.
+		$parent   = -1;
+		unset( $query_args['post__not_in'], $query_args['meta_key'], $query_args['meta_value'] );
+		$hierarchical           = false;
+		$query_args['post__in'] = wp_parse_id_list( $parsed_args['include'] );
+	}
+
 	if ( ! empty( $parsed_args['authors'] ) ) {
 		$post_authors = wp_parse_list( $parsed_args['authors'] );
 
 		if ( ! empty( $post_authors ) ) {
+			$query_args['author__in'] = array();
 			foreach ( $post_authors as $post_author ) {
 				// Do we have an author id or an author login?
 				if ( 0 == (int) $post_author ) {
@@ -6050,136 +6192,61 @@
 					}
 					$post_author = $post_author->ID;
 				}
-
-				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 ) {
-				$author_query = " AND ($author_query)";
+				$query_args['author__in'][] = (int) $post_author;
 			}
 		}
 	}
 
-	$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   = wp_unslash( $meta_key );
-		$meta_value = wp_unslash( $meta_value );
-		if ( '' !== $meta_key ) {
-			$where .= $wpdb->prepare( " AND $wpdb->postmeta.meta_key = %s", $meta_key );
-		}
-		if ( '' !== $meta_value ) {
-			$where .= $wpdb->prepare( " AND $wpdb->postmeta.meta_value = %s", $meta_value );
-		}
-	}
-
 	if ( is_array( $parent ) ) {
-		$post_parent__in = implode( ',', array_map( 'absint', (array) $parent ) );
+		$post_parent__in = array_map( 'absint', (array) $parent );
 		if ( ! empty( $post_parent__in ) ) {
-			$where .= " AND post_parent IN ($post_parent__in)";
+			$query_args['post_parent__in'] = $post_parent__in;
 		}
 	} elseif ( $parent >= 0 ) {
-		$where .= $wpdb->prepare( ' AND post_parent = %d ', $parent );
-	}
-
-	if ( 1 === count( $post_status ) ) {
-		$where_post_type = $wpdb->prepare( 'post_type = %s AND post_status = %s', $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')", $parsed_args['post_type'] );
-	}
-
-	$orderby_array = array();
-	$allowed_keys  = array(
-		'author',
-		'post_author',
-		'date',
-		'post_date',
-		'title',
-		'post_title',
-		'name',
-		'post_name',
-		'modified',
-		'post_modified',
-		'modified_gmt',
-		'post_modified_gmt',
-		'menu_order',
-		'parent',
-		'post_parent',
-		'ID',
-		'rand',
-		'comment_count',
+		$query_args['post_parent'] = $parent;
+	}
+
+	/*
+	 * Maintain backward compatibility for `sort_column` key.
+	 * Additionally to `WP_Query`, it has been supporting the `post_modified_gmt` field, so this logic will translate
+	 * it to `post_modified` which should result in the same order given the two dates in the fields match.
+	 */
+	$orderby = wp_parse_list( $parsed_args['sort_column'] );
+	$orderby = array_map(
+		static function ( $orderby_field ) {
+			$orderby_field = trim( $orderby_field );
+			if ( 'post_modified_gmt' === $orderby_field || 'modified_gmt' === $orderby_field ) {
+				$orderby_field = str_replace( '_gmt', '', $orderby_field );
+			}
+			return $orderby_field;
+		},
+		$orderby
 	);
-
-	foreach ( explode( ',', $parsed_args['sort_column'] ) as $orderby ) {
-		$orderby = trim( $orderby );
-		if ( ! in_array( $orderby, $allowed_keys, true ) ) {
-			continue;
-		}
-
-		switch ( $orderby ) {
-			case 'menu_order':
-				break;
-			case 'ID':
-				$orderby = "$wpdb->posts.ID";
-				break;
-			case 'rand':
-				$orderby = 'RAND()';
-				break;
-			case 'comment_count':
-				$orderby = "$wpdb->posts.comment_count";
-				break;
-			default:
-				if ( 0 === strpos( $orderby, 'post_' ) ) {
-					$orderby = "$wpdb->posts." . $orderby;
-				} else {
-					$orderby = "$wpdb->posts.post_" . $orderby;
-				}
-		}
-
-		$orderby_array[] = $orderby;
-
-	}
-	$sort_column = ! empty( $orderby_array ) ? implode( ',', $orderby_array ) : "$wpdb->posts.post_title";
-
-	$sort_order = strtoupper( $parsed_args['sort_order'] );
-	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;
-	$query .= ' ORDER BY ' . $sort_column . ' ' . $sort_order;
+	if ( $orderby ) {
+		$query_args['orderby'] = array_fill_keys( $orderby, $parsed_args['sort_order'] );
+	}
+
+	$order = $parsed_args['sort_order'];
+	if ( $order ) {
+		$query_args['order'] = $order;
+	}
 
 	if ( ! empty( $number ) ) {
-		$query .= ' LIMIT ' . $offset . ',' . $number;
-	}
-
-	$pages = $wpdb->get_results( $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(), $parsed_args );
-
-		return $pages;
-	}
-
-	// Sanitize before caching so it'll only get done once.
-	$num_pages = count( $pages );
-	for ( $i = 0; $i < $num_pages; $i++ ) {
-		$pages[ $i ] = sanitize_post( $pages[ $i ], 'raw' );
-	}
-
-	// Update cache.
-	update_post_cache( $pages );
+		$query_args['posts_per_page'] = $number;
+	}
+
+	/**
+	 * Filters query arguments passed to WP_Query in get_pages.
+	 *
+	 * @since 6.3.0
+	 *
+	 * @param array $query_args  Array of arguments passed to WP_Query.
+	 * @param array $parsed_args Array of get_pages() arguments.
+	 */
+	$query_args = apply_filters( 'get_pages_query_args', $query_args, $parsed_args );
+
+	$pages = new WP_Query();
+	$pages = $pages->query( $query_args );
 
 	if ( $child_of || $hierarchical ) {
 		$pages = get_page_children( $child_of, $pages );
@@ -6202,16 +6269,6 @@
 		}
 	}
 
-	$page_structure = array();
-	foreach ( $pages as $page ) {
-		$page_structure[] = $page->ID;
-	}
-
-	wp_cache_set( $cache_key, $page_structure, 'posts' );
-
-	// Convert to WP_Post instances.
-	$pages = array_map( 'get_post', $pages );
-
 	/**
 	 * Filters the retrieved list of pages.
 	 *
@@ -6240,10 +6297,10 @@
  * @return bool True on success, false on failure.
  */
 function is_local_attachment( $url ) {
-	if ( strpos( $url, home_url() ) === false ) {
+	if ( ! str_contains( $url, home_url() ) ) {
 		return false;
 	}
-	if ( strpos( $url, home_url( '/?attachment_id=' ) ) !== false ) {
+	if ( str_contains( $url, home_url( '/?attachment_id=' ) ) ) {
 		return true;
 	}
 
@@ -6258,7 +6315,7 @@
 }
 
 /**
- * Insert an attachment.
+ * Inserts an attachment.
  *
  * If you set the 'ID' in the $args parameter, it will mean that you are
  * updating and attempt to update the attachment. You can also set the
@@ -6278,13 +6335,13 @@
  * @see wp_insert_post()
  *
  * @param string|array $args             Arguments for inserting an attachment.
- * @param string|false $file             Optional. Filename.
- * @param int          $parent           Optional. Parent post ID.
+ * @param string|false $file             Optional. Filename. Default false.
+ * @param int          $parent_post_id   Optional. Parent post ID or 0 for no parent. Default 0.
  * @param bool         $wp_error         Optional. Whether to return a WP_Error on failure. Default false.
  * @param bool         $fire_after_hooks Optional. Whether to fire the after insert hooks. Default true.
  * @return int|WP_Error The attachment ID on success. The value 0 or WP_Error on failure.
  */
-function wp_insert_attachment( $args, $file = false, $parent = 0, $wp_error = false, $fire_after_hooks = true ) {
+function wp_insert_attachment( $args, $file = false, $parent_post_id = 0, $wp_error = false, $fire_after_hooks = true ) {
 	$defaults = array(
 		'file'        => $file,
 		'post_parent' => 0,
@@ -6292,8 +6349,8 @@
 
 	$data = wp_parse_args( $args, $defaults );
 
-	if ( ! empty( $parent ) ) {
-		$data['post_parent'] = $parent;
+	if ( ! empty( $parent_post_id ) ) {
+		$data['post_parent'] = $parent_post_id;
 	}
 
 	$data['post_type'] = 'attachment';
@@ -6302,7 +6359,7 @@
 }
 
 /**
- * Trash or delete an attachment.
+ * Trashes or deletes an attachment.
  *
  * When an attachment is permanently deleted, the file will also be removed.
  * Deletion removes all post meta fields, taxonomy, comments, etc. associated
@@ -6344,7 +6401,7 @@
 	 *
 	 * @since 5.5.0
 	 *
-	 * @param WP_Post|false|null $delete       Whether to go forward with deletion. @TODO description
+	 * @param WP_Post|false|null $delete       Whether to go forward with deletion.
 	 * @param WP_Post            $post         Post object.
 	 * @param bool               $force_delete Whether to bypass the Trash.
 	 */
@@ -6506,6 +6563,7 @@
  * Retrieves attachment metadata for attachment ID.
  *
  * @since 2.1.0
+ * @since 6.0.0 The `$filesize` value was added to the returned array.
  *
  * @param int  $attachment_id Attachment post ID. Defaults to global $post.
  * @param bool $unfiltered    Optional. If true, filters are not run. Default false.
@@ -6590,7 +6648,7 @@
 }
 
 /**
- * Retrieve the URL for an attachment.
+ * Retrieves the URL for an attachment.
  *
  * @since 2.1.0
  *
@@ -6622,10 +6680,10 @@
 		$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'] ) ) {
+			if ( str_starts_with( $file, $uploads['basedir'] ) ) {
 				// Replace file location with url location.
 				$url = str_replace( $uploads['basedir'], $uploads['baseurl'], $file );
-			} elseif ( false !== strpos( $file, 'wp-content/uploads' ) ) {
+			} elseif ( str_contains( $file, 'wp-content/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 {
@@ -6699,87 +6757,36 @@
 }
 
 /**
- * Retrieve thumbnail for an attachment.
+ * Retrieves URL for an attachment thumbnail.
  *
  * @since 2.1.0
- *
- * @param int $post_id Optional. Attachment ID. Default is the ID of the global `$post`.
- * @return string|false Thumbnail file path on success, false on failure.
- */
-function wp_get_attachment_thumb_file( $post_id = 0 ) {
-	$post_id = (int) $post_id;
-	$post    = get_post( $post_id );
-
-	if ( ! $post ) {
-		return false;
-	}
-
-	$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 );
-		if ( file_exists( $thumbfile ) ) {
-			/**
-			 * Filters the attachment thumbnail file path.
-			 *
-			 * @since 2.1.0
-			 *
-			 * @param string $thumbfile File path to the attachment thumbnail.
-			 * @param int    $post_id   Attachment ID.
-			 */
-			return apply_filters( 'wp_get_attachment_thumb_file', $thumbfile, $post->ID );
-		}
-	}
-	return false;
-}
-
-/**
- * Retrieve URL for an attachment thumbnail.
- *
- * @since 2.1.0
+ * @since 6.1.0 Changed to use wp_get_attachment_image_url().
  *
  * @param int $post_id Optional. Attachment ID. Default is the ID of the global `$post`.
  * @return string|false Thumbnail URL on success, false on failure.
  */
 function wp_get_attachment_thumb_url( $post_id = 0 ) {
 	$post_id = (int) $post_id;
-	$post    = get_post( $post_id );
-
-	if ( ! $post ) {
-		return false;
-	}
-
-	$url = wp_get_attachment_url( $post->ID );
-	if ( ! $url ) {
+
+	/*
+	 * This uses image_downsize() which also looks for the (very) old format $image_meta['thumb']
+	 * when the newer format $image_meta['sizes']['thumbnail'] doesn't exist.
+	 */
+	$thumbnail_url = wp_get_attachment_image_url( $post_id, 'thumbnail' );
+
+	if ( empty( $thumbnail_url ) ) {
 		return false;
 	}
 
-	$sized = image_downsize( $post_id, 'thumbnail' );
-	if ( $sized ) {
-		return $sized[0];
-	}
-
-	$thumb = wp_get_attachment_thumb_file( $post->ID );
-	if ( ! $thumb ) {
-		return false;
-	}
-
-	$url = str_replace( wp_basename( $url ), wp_basename( $thumb ), $url );
-
 	/**
 	 * Filters the attachment thumbnail URL.
 	 *
 	 * @since 2.1.0
 	 *
-	 * @param string $url     URL for the attachment thumbnail.
-	 * @param int    $post_id Attachment ID.
+	 * @param string $thumbnail_url URL for the attachment thumbnail.
+	 * @param int    $post_id       Attachment ID.
 	 */
-	return apply_filters( 'wp_get_attachment_thumb_url', $url, $post->ID );
+	return apply_filters( 'wp_get_attachment_thumb_url', $thumbnail_url, $post_id );
 }
 
 /**
@@ -6787,9 +6794,9 @@
  *
  * @since 4.2.0
  *
- * @param string      $type Attachment type. Accepts 'image', 'audio', or 'video'.
+ * @param string      $type Attachment type. Accepts `image`, `audio`, `video`, or a file extension.
  * @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.
+ * @return bool True if an accepted type or a matching file extension, false otherwise.
  */
 function wp_attachment_is( $type, $post = null ) {
 	$post = get_post( $post );
@@ -6804,7 +6811,7 @@
 		return false;
 	}
 
-	if ( 0 === strpos( $post->post_mime_type, $type . '/' ) ) {
+	if ( str_starts_with( $post->post_mime_type, $type . '/' ) ) {
 		return true;
 	}
 
@@ -6822,7 +6829,7 @@
 
 	switch ( $type ) {
 		case 'image':
-			$image_exts = array( 'jpg', 'jpeg', 'jpe', 'gif', 'png', 'webp' );
+			$image_exts = array( 'jpg', 'jpeg', 'jpe', 'gif', 'png', 'webp', 'avif' );
 			return in_array( $ext, $image_exts, true );
 
 		case 'audio':
@@ -6855,18 +6862,25 @@
 }
 
 /**
- * Retrieve the icon for a MIME type or attachment.
+ * Retrieves the icon for a MIME type or attachment.
  *
  * @since 2.1.0
- *
- * @param string|int $mime MIME type or attachment ID.
+ * @since 6.5.0 Added the `$preferred_ext` parameter.
+ *
+ * @param string|int $mime          MIME type or attachment ID.
+ * @param string     $preferred_ext File format to prefer in return. Default '.png'.
  * @return string|false Icon, false otherwise.
  */
-function wp_mime_type_icon( $mime = 0 ) {
+function wp_mime_type_icon( $mime = 0, $preferred_ext = '.png' ) {
 	if ( ! is_numeric( $mime ) ) {
 		$icon = wp_cache_get( "mime_type_icon_$mime" );
 	}
 
+	// Check if preferred file format variable is present and is a validly formatted file extension.
+	if ( ! empty( $preferred_ext ) && is_string( $preferred_ext ) && ! str_starts_with( $preferred_ext, '.' ) ) {
+		$preferred_ext = '.' . strtolower( $preferred_ext );
+	}
+
 	$post_id = 0;
 	if ( empty( $icon ) ) {
 		$post_mimes = array();
@@ -6922,6 +6936,7 @@
 			 */
 			$dirs       = apply_filters( 'icon_dirs', array( $icon_dir => $icon_dir_uri ) );
 			$icon_files = array();
+			$all_icons  = array();
 			while ( $dirs ) {
 				$keys = array_keys( $dirs );
 				$dir  = array_shift( $keys );
@@ -6930,22 +6945,29 @@
 				if ( $dh ) {
 					while ( false !== $file = readdir( $dh ) ) {
 						$file = wp_basename( $file );
-						if ( '.' === substr( $file, 0, 1 ) ) {
+						if ( str_starts_with( $file, '.' ) ) {
 							continue;
 						}
 
 						$ext = strtolower( substr( $file, -4 ) );
-						if ( ! in_array( $ext, array( '.png', '.gif', '.jpg' ), true ) ) {
+						if ( ! in_array( $ext, array( '.svg', '.png', '.gif', '.jpg' ), true ) ) {
 							if ( is_dir( "$dir/$file" ) ) {
 								$dirs[ "$dir/$file" ] = "$uri/$file";
 							}
 							continue;
 						}
-						$icon_files[ "$dir/$file" ] = "$uri/$file";
+						$all_icons[ "$dir/$file" ] = "$uri/$file";
+						if ( $ext === $preferred_ext ) {
+							$icon_files[ "$dir/$file" ] = "$uri/$file";
+						}
 					}
 					closedir( $dh );
 				}
 			}
+			// If directory only contained icons of a non-preferred format, return those.
+			if ( empty( $icon_files ) ) {
+				$icon_files = $all_icons;
+			}
 			wp_cache_add( 'icon_files', $icon_files, 'default', 600 );
 		}
 
@@ -6993,7 +7015,7 @@
 }
 
 /**
- * Check for changed slugs for published post objects and save the old slug.
+ * Checks for changed slugs for published post objects and save the old slug.
  *
  * The function is used when a post object of any type is updated,
  * by comparing the current and previous post objects.
@@ -7008,8 +7030,8 @@
  * @since 2.1.0
  *
  * @param int     $post_id     Post ID.
- * @param WP_Post $post        The Post Object
- * @param WP_Post $post_before The Previous Post Object
+ * @param WP_Post $post        The post object.
+ * @param WP_Post $post_before The previous post object.
  */
 function wp_check_for_changed_slugs( $post_id, $post, $post_before ) {
 	// Don't bother if it hasn't changed.
@@ -7036,7 +7058,7 @@
 }
 
 /**
- * Check for changed dates for published post objects and save the old date.
+ * Checks for changed dates for published post objects and save the old date.
  *
  * The function is used when a post object of any type is updated,
  * by comparing the current and previous post objects.
@@ -7051,8 +7073,8 @@
  * @since 4.9.3
  *
  * @param int     $post_id     Post ID.
- * @param WP_Post $post        The Post Object
- * @param WP_Post $post_before The Previous Post Object
+ * @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 = gmdate( 'Y-m-d', strtotime( $post_before->post_date ) );
@@ -7082,7 +7104,7 @@
 }
 
 /**
- * Retrieve the private post SQL based on capability.
+ * Retrieves the private post SQL based on capability.
  *
  * This function provides a standardized way to appropriately select on the
  * post_status of a post type. The function will return a piece of SQL code
@@ -7100,7 +7122,7 @@
 }
 
 /**
- * Retrieve the post SQL based on capability, author, and type.
+ * Retrieves the post SQL based on capability, author, and type.
  *
  * @since 3.0.0
  * @since 4.3.0 Introduced the ability to pass an array of post types to `$post_type`.
@@ -7128,6 +7150,7 @@
 	$post_type_clauses = array();
 	foreach ( $post_types as $post_type ) {
 		$post_type_obj = get_post_type_object( $post_type );
+
 		if ( ! $post_type_obj ) {
 			continue;
 		}
@@ -7142,12 +7165,14 @@
 		 * @param string $cap 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'";
+
 		if ( false === $public_only ) {
 			if ( $cap ) {
 				// Does the user have the capability to view private posts? Guess so.
@@ -7220,7 +7245,7 @@
 }
 
 /**
- * Get the most recent time that a post on the site was modified.
+ * Gets 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.
@@ -7391,6 +7416,7 @@
 	}
 
 	wp_cache_delete( $post->ID, 'posts' );
+	wp_cache_delete( 'post_parent:' . (string) $post->ID, 'posts' );
 	wp_cache_delete( $post->ID, 'post_meta' );
 
 	clean_object_term_cache( $post->ID, $post->post_type );
@@ -7420,15 +7446,15 @@
 		do_action( 'clean_page_cache', $post->ID );
 	}
 
-	wp_cache_set( 'last_changed', microtime(), 'posts' );
-}
-
-/**
- * Call major cache updating functions for list of Post objects.
+	wp_cache_set_posts_last_changed();
+}
+
+/**
+ * Updates post, term, and metadata caches for a list of post objects.
  *
  * @since 1.5.0
  *
- * @param WP_Post[] $posts             Array of Post objects
+ * @param WP_Post[] $posts             Array of post objects (passed by reference).
  * @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_meta_cache Optional. Whether to update the meta cache. Default true.
@@ -7475,7 +7501,48 @@
 }
 
 /**
- * Updates metadata cache for list of post IDs.
+ * Updates post author user caches for a list of post objects.
+ *
+ * @since 6.1.0
+ *
+ * @param WP_Post[] $posts Array of post objects.
+ */
+function update_post_author_caches( $posts ) {
+	/*
+	 * cache_users() is a pluggable function so is not available prior
+	 * to the `plugins_loaded` hook firing. This is to ensure against
+	 * fatal errors when the function is not available.
+	 */
+	if ( ! function_exists( 'cache_users' ) ) {
+		return;
+	}
+
+	$author_ids = wp_list_pluck( $posts, 'post_author' );
+	$author_ids = array_map( 'absint', $author_ids );
+	$author_ids = array_unique( array_filter( $author_ids ) );
+
+	cache_users( $author_ids );
+}
+
+/**
+ * Updates parent post caches for a list of post objects.
+ *
+ * @since 6.1.0
+ *
+ * @param WP_Post[] $posts Array of post objects.
+ */
+function update_post_parent_caches( $posts ) {
+	$parent_ids = wp_list_pluck( $posts, 'post_parent' );
+	$parent_ids = array_map( 'absint', $parent_ids );
+	$parent_ids = array_unique( array_filter( $parent_ids ) );
+
+	if ( ! empty( $parent_ids ) ) {
+		_prime_post_caches( $parent_ids, false );
+	}
+}
+
+/**
+ * Updates metadata cache for a list of post IDs.
  *
  * Performs SQL query to retrieve the metadata for the post IDs and updates the
  * metadata cache for the posts. Therefore, the functions, which call this
@@ -7657,14 +7724,16 @@
  */
 function wp_get_post_parent_id( $post = null ) {
 	$post = get_post( $post );
+
 	if ( ! $post || is_wp_error( $post ) ) {
 		return false;
 	}
+
 	return (int) $post->post_parent;
 }
 
 /**
- * Check the given subset of the post hierarchy for hierarchy loops.
+ * Checks the given subset of the post hierarchy for hierarchy loops.
  *
  * Prevents loops from forming and breaks those that it finds. Attached
  * to the {@see 'wp_insert_post_parent'} filter.
@@ -7674,37 +7743,37 @@
  * @see wp_find_hierarchy_loop()
  *
  * @param int $post_parent ID of the parent for the post we're checking.
- * @param int $post_ID     ID of the post we're checking.
+ * @param int $post_id     ID of the post we're checking.
  * @return int The new post_parent for the post, 0 otherwise.
  */
-function wp_check_post_hierarchy_for_loops( $post_parent, $post_ID ) {
+function wp_check_post_hierarchy_for_loops( $post_parent, $post_id ) {
 	// Nothing fancy here - bail.
 	if ( ! $post_parent ) {
 		return 0;
 	}
 
 	// New post can't cause a loop.
-	if ( ! $post_ID ) {
+	if ( ! $post_id ) {
 		return $post_parent;
 	}
 
 	// Can't be its own parent.
-	if ( $post_parent == $post_ID ) {
+	if ( $post_parent == $post_id ) {
 		return 0;
 	}
 
 	// Now look for larger loops.
-	$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 );
 	if ( ! $loop ) {
 		return $post_parent; // No loop.
 	}
 
 	// Setting $post_parent to the given value causes a loop.
-	if ( isset( $loop[ $post_ID ] ) ) {
+	if ( isset( $loop[ $post_id ] ) ) {
 		return 0;
 	}
 
-	// There's a loop, but it doesn't contain $post_ID. Break the loop.
+	// There's a loop, but it doesn't contain $post_id. Break the loop.
 	foreach ( array_keys( $loop ) as $loop_member ) {
 		wp_update_post(
 			array(
@@ -7756,7 +7825,7 @@
 }
 
 /**
- * Delete auto-drafts for new posts that are > 7 days old.
+ * Deletes auto-drafts for new posts that are > 7 days old.
  *
  * @since 3.4.0
  *
@@ -7778,11 +7847,11 @@
  *
  * @since 4.5.0
  *
- * @param array $posts Array of WP_Post objects.
+ * @param WP_Post[] $posts Array of WP_Post objects.
  */
 function wp_queue_posts_for_term_meta_lazyload( $posts ) {
 	$post_type_taxonomies = array();
-	$term_ids             = array();
+	$prime_post_terms     = array();
 	foreach ( $posts as $post ) {
 		if ( ! ( $post instanceof WP_Post ) ) {
 			continue;
@@ -7793,26 +7862,36 @@
 		}
 
 		foreach ( $post_type_taxonomies[ $post->post_type ] as $taxonomy ) {
-			// Term cache should already be primed by `update_post_term_cache()`.
-			$terms = get_object_term_cache( $post->ID, $taxonomy );
-			if ( false !== $terms ) {
-				foreach ( $terms as $term ) {
-					if ( ! in_array( $term->term_id, $term_ids, true ) ) {
-						$term_ids[] = $term->term_id;
+			$prime_post_terms[ $taxonomy ][] = $post->ID;
+		}
+	}
+
+	$term_ids = array();
+	if ( $prime_post_terms ) {
+		foreach ( $prime_post_terms as $taxonomy => $post_ids ) {
+			$cached_term_ids = wp_cache_get_multiple( $post_ids, "{$taxonomy}_relationships" );
+			if ( is_array( $cached_term_ids ) ) {
+				$cached_term_ids = array_filter( $cached_term_ids );
+				foreach ( $cached_term_ids as $_term_ids ) {
+					// Backward compatibility for if a plugin is putting objects into the cache, rather than IDs.
+					foreach ( $_term_ids as $term_id ) {
+						if ( is_numeric( $term_id ) ) {
+							$term_ids[] = (int) $term_id;
+						} elseif ( isset( $term_id->term_id ) ) {
+							$term_ids[] = (int) $term_id->term_id;
+						}
 					}
 				}
 			}
 		}
-	}
-
-	if ( $term_ids ) {
-		$lazyloader = wp_metadata_lazyloader();
-		$lazyloader->queue_objects( 'term', $term_ids );
-	}
-}
-
-/**
- * Update the custom taxonomies' term counts when a post's status is changed.
+		$term_ids = array_unique( $term_ids );
+	}
+
+	wp_lazyload_term_meta( $term_ids );
+}
+
+/**
+ * Updates the custom taxonomies' term counts when a post's status is changed.
  *
  * For example, default posts term counts (for custom taxonomies) don't include
  * private / draft posts.
@@ -7836,13 +7915,15 @@
  * 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 6.1.0 This function is no longer marked as "private".
+ *
+ * @see update_post_cache()
+ * @see update_postmeta_cache()
+ * @see update_object_term_cache()
  *
  * @global wpdb $wpdb WordPress database abstraction object.
  *
- * @param array $ids               ID list.
+ * @param int[] $ids               ID list.
  * @param bool  $update_term_cache Optional. Whether to update the term cache. Default true.
  * @param bool  $update_meta_cache Optional. Whether to update the meta cache. Default true.
  */
@@ -7853,7 +7934,67 @@
 	if ( ! empty( $non_cached_ids ) ) {
 		$fresh_posts = $wpdb->get_results( sprintf( "SELECT $wpdb->posts.* FROM $wpdb->posts WHERE ID IN (%s)", implode( ',', $non_cached_ids ) ) );
 
-		update_post_caches( $fresh_posts, 'any', $update_term_cache, $update_meta_cache );
+		if ( $fresh_posts ) {
+			// Despite the name, update_post_cache() expects an array rather than a single post.
+			update_post_cache( $fresh_posts );
+		}
+	}
+
+	if ( $update_meta_cache ) {
+		update_postmeta_cache( $ids );
+	}
+
+	if ( $update_term_cache ) {
+		$post_types = array_map( 'get_post_type', $ids );
+		$post_types = array_unique( $post_types );
+		update_object_term_cache( $ids, $post_types );
+	}
+}
+
+/**
+ * Prime the cache containing the parent ID of various post objects.
+ *
+ * @since 6.4.0
+ *
+ * @global wpdb $wpdb WordPress database abstraction object.
+ *
+ * @param int[] $ids ID list.
+ */
+function _prime_post_parent_id_caches( array $ids ) {
+	global $wpdb;
+
+	$ids = array_filter( $ids, '_validate_cache_id' );
+	$ids = array_unique( array_map( 'intval', $ids ), SORT_NUMERIC );
+
+	if ( empty( $ids ) ) {
+		return;
+	}
+
+	$cache_keys = array();
+	foreach ( $ids as $id ) {
+		$cache_keys[ $id ] = 'post_parent:' . (string) $id;
+	}
+
+	$cached_data = wp_cache_get_multiple( array_values( $cache_keys ), 'posts' );
+
+	$non_cached_ids = array();
+	foreach ( $cache_keys as $id => $cache_key ) {
+		if ( false === $cached_data[ $cache_key ] ) {
+			$non_cached_ids[] = $id;
+		}
+	}
+
+	if ( ! empty( $non_cached_ids ) ) {
+		$fresh_posts = $wpdb->get_results( sprintf( "SELECT $wpdb->posts.ID, $wpdb->posts.post_parent FROM $wpdb->posts WHERE ID IN (%s)", implode( ',', $non_cached_ids ) ) );
+
+		if ( $fresh_posts ) {
+			$post_parent_data = array();
+			foreach ( $fresh_posts as $fresh_post ) {
+				$post_parent_data[ 'post_parent:' . (string) $fresh_post->ID ] = (int) $fresh_post->post_parent;
+			}
+
+			wp_cache_add_multiple( $post_parent_data, 'posts' );
+		}
 	}
 }
 
@@ -7869,16 +8010,16 @@
  * @access private
  *
  * @param string $post_name Post slug.
- * @param int    $post_ID   Optional. Post ID that should be ignored. Default 0.
- */
-function wp_add_trashed_suffix_to_post_name_for_trashed_posts( $post_name, $post_ID = 0 ) {
+ * @param int    $post_id   Optional. Post ID that should be ignored. Default 0.
+ */
+function wp_add_trashed_suffix_to_post_name_for_trashed_posts( $post_name, $post_id = 0 ) {
 	$trashed_posts_with_desired_slug = get_posts(
 		array(
 			'name'         => $post_name,
 			'post_status'  => 'trash',
 			'post_type'    => 'any',
 			'nopaging'     => true,
-			'post__not_in' => array( $post_ID ),
+			'post__not_in' => array( $post_id ),
 		)
 	);
 
@@ -7900,6 +8041,8 @@
  * @since 4.5.0
  * @access private
  *
+ * @global wpdb $wpdb WordPress database abstraction object.
+ *
  * @param WP_Post $post The post.
  * @return string New slug for the post.
  */
@@ -7908,7 +8051,7 @@
 
 	$post = get_post( $post );
 
-	if ( '__trashed' === substr( $post->post_name, -9 ) ) {
+	if ( str_ends_with( $post->post_name, '__trashed' ) ) {
 		return $post->post_name;
 	}
 	add_post_meta( $post->ID, '_wp_desired_post_slug', $post->post_name );
@@ -7919,59 +8062,43 @@
 }
 
 /**
- * Filters the SQL clauses of an attachment query to include filenames.
- *
- * @since 4.7.0
- * @access private
- *
- * @global wpdb $wpdb WordPress database abstraction object.
- *
- * @param string[] $clauses An array including WHERE, GROUP BY, JOIN, ORDER BY,
- *                          DISTINCT, fields (SELECT), and LIMITS clauses.
- * @return string[] The modified array of clauses.
- */
-function _filter_query_attachment_filenames( $clauses ) {
-	global $wpdb;
-	remove_filter( 'posts_clauses', __FUNCTION__ );
-
-	// Add a LEFT JOIN of the postmeta table so we don't trample existing JOINs.
-	$clauses['join'] .= " LEFT JOIN {$wpdb->postmeta} AS sq1 ON ( {$wpdb->posts}.ID = sq1.post_id AND sq1.meta_key = '_wp_attached_file' )";
-
-	$clauses['groupby'] = "{$wpdb->posts}.ID";
-
-	$clauses['where'] = preg_replace(
-		"/\({$wpdb->posts}.post_content (NOT LIKE|LIKE) (\'[^']+\')\)/",
-		'$0 OR ( sq1.meta_value $1 $2 )',
-		$clauses['where']
-	);
-
-	return $clauses;
-}
-
-/**
  * Sets the last changed time for the 'posts' cache group.
  *
  * @since 5.0.0
  */
 function wp_cache_set_posts_last_changed() {
-	wp_cache_set( 'last_changed', microtime(), 'posts' );
-}
-
-/**
- * Get all available post MIME types for a given post type.
+	wp_cache_set_last_changed( 'posts' );
+}
+
+/**
+ * Gets all available post MIME types for a given post type.
  *
  * @since 2.5.0
  *
  * @global wpdb $wpdb WordPress database abstraction object.
  *
  * @param string $type
- * @return mixed
+ * @return string[] An array of MIME types.
  */
 function get_available_post_mime_types( $type = 'attachment' ) {
 	global $wpdb;
 
-	$types = $wpdb->get_col( $wpdb->prepare( "SELECT DISTINCT post_mime_type FROM $wpdb->posts WHERE post_type = %s", $type ) );
-	return $types;
+	/**
+	 * Filters the list of available post MIME types for the given post type.
+	 *
+	 * @since 6.4.0
+	 *
+	 * @param string[]|null $mime_types An array of MIME types. Default null.
+	 * @param string        $type       The post type name. Usually 'attachment' but can be any post type.
+	 */
+	$mime_types = apply_filters( 'pre_get_available_post_mime_types', null, $type );
+
+	if ( ! is_array( $mime_types ) ) {
+		$mime_types = $wpdb->get_col( $wpdb->prepare( "SELECT DISTINCT post_mime_type FROM $wpdb->posts WHERE post_type = %s AND post_mime_type != ''", $type ) );
+	}
+
+	// Remove nulls from returned $mime_types.
+	return array_values( array_filter( $mime_types ) );
 }
 
 /**
@@ -8015,7 +8142,7 @@
 }
 
 /**
- * Retrieve the URL to an original attachment image.
+ * Retrieves 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
@@ -8057,7 +8184,7 @@
 }
 
 /**
- * Filter callback which sets the status of an untrashed post to its previous status.
+ * Filters callback which sets the status of an untrashed post to its previous status.
  *
  * This can be used as a callback on the `wp_untrash_post_status` filter.
  *
@@ -8071,3 +8198,100 @@
 function wp_untrash_post_set_previous_status( $new_status, $post_id, $previous_status ) {
 	return $previous_status;
 }
+
+/**
+ * Returns whether the post can be edited in the block editor.
+ *
+ * @since 5.0.0
+ * @since 6.1.0 Moved to wp-includes from wp-admin.
+ *
+ * @param int|WP_Post $post Post ID or WP_Post object.
+ * @return bool Whether the post can be edited in the block editor.
+ */
+function use_block_editor_for_post( $post ) {
+	$post = get_post( $post );
+
+	if ( ! $post ) {
+		return false;
+	}
+
+	// We're in the meta box loader, so don't use the block editor.
+	if ( is_admin() && isset( $_GET['meta-box-loader'] ) ) {
+		check_admin_referer( 'meta-box-loader', 'meta-box-loader-nonce' );
+		return false;
+	}
+
+	$use_block_editor = use_block_editor_for_post_type( $post->post_type );
+
+	/**
+	 * Filters whether a post is able to be edited in the block editor.
+	 *
+	 * @since 5.0.0
+	 *
+	 * @param bool    $use_block_editor Whether the post can be edited or not.
+	 * @param WP_Post $post             The post being checked.
+	 */
+	return apply_filters( 'use_block_editor_for_post', $use_block_editor, $post );
+}
+
+/**
+ * Returns whether a post type is compatible with the block editor.
+ *
+ * The block editor depends on the REST API, and if the post type is not shown in the
+ * REST API, then it won't work with the block editor.
+ *
+ * @since 5.0.0
+ * @since 6.1.0 Moved to wp-includes from wp-admin.
+ *
+ * @param string $post_type The post type.
+ * @return bool Whether the post type can be edited with the block editor.
+ */
+function use_block_editor_for_post_type( $post_type ) {
+	if ( ! post_type_exists( $post_type ) ) {
+		return false;
+	}
+
+	if ( ! post_type_supports( $post_type, 'editor' ) ) {
+		return false;
+	}
+
+	$post_type_object = get_post_type_object( $post_type );
+	if ( $post_type_object && ! $post_type_object->show_in_rest ) {
+		return false;
+	}
+
+	/**
+	 * Filters whether a post is able to be edited in the block editor.
+	 *
+	 * @since 5.0.0
+	 *
+	 * @param bool   $use_block_editor  Whether the post type can be edited or not. Default true.
+	 * @param string $post_type         The post type being checked.
+	 */
+	return apply_filters( 'use_block_editor_for_post_type', true, $post_type );
+}
+
+/**
+ * Registers any additional post meta fields.
+ *
+ * @since 6.3.0 Adds `wp_pattern_sync_status` meta field to the wp_block post type so an unsynced option can be added.
+ *
+ * @link https://github.com/WordPress/gutenberg/pull/51144
+ */
+function wp_create_initial_post_meta() {
+	register_post_meta(
+		'wp_block',
+		'wp_pattern_sync_status',
+		array(
+			'sanitize_callback' => 'sanitize_text_field',
+			'single'            => true,
+			'type'              => 'string',
+			'show_in_rest'      => array(
+				'schema' => array(
+					'type' => 'string',
+					'enum' => array( 'partial', 'unsynced' ),
+				),
+			),
+		)
+	);
+}