Media: Add a filter to the `get_available_post_mime_types()` function to allow overriding its database query.

This introduces the `get_available_post_mime_types` filter so this query can be skipped or cached by plugins.

Props maciejmackowiak, archon810, rcorrales

Fixes #52759

Built from https://develop.svn.wordpress.org/trunk@56452


git-svn-id: http://core.svn.wordpress.org/trunk@55964 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-includes/post.php

@@ -7866,8 +7866,21 @@ function wp_cache_set_posts_last_changed() {
 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( '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", $type ) );
+	}
+
+	return $mime_types;
 }
 
 /**

wp-includes/version.php

@@ -16,7 +16,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '6.4-alpha-56451';
+$wp_version = '6.4-alpha-56452';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.