+ // Make sure everything is valid.
+ if ( ! $meta_type || ! is_numeric( $meta_id ) ) {
+ return false;
+ }
+
+ $meta_id = absint( $meta_id );
+ if ( ! $meta_id ) {
+ return false;
+ }
+
+ $table = _get_meta_table( $meta_type );
+ if ( ! $table ) {
+ return false;
+ }
+
+ // object and id columns
+ $column = sanitize_key($meta_type . '_id');
+ $id_column = 'user' == $meta_type ? 'umeta_id' : 'meta_id';
+
+ // Fetch the meta and go on if it's found.
+ if ( $meta = get_metadata_by_mid( $meta_type, $meta_id ) ) {
+ $object_id = $meta->{$column};
+
+ /** This action is documented in wp-includes/meta.php */
+ do_action( "delete_{$meta_type}_meta", (array) $meta_id, $object_id, $meta->meta_key, $meta->meta_value );
+
+ // Old-style action.
+ if ( 'post' == $meta_type || 'comment' == $meta_type ) {
+ /**
+ * Fires immediately before deleting post or comment metadata of a specific type.
+ *
+ * The dynamic portion of the hook, `$meta_type`, refers to the meta
+ * object type (post or comment).
+ *
+ * @since 3.4.0
+ *
+ * @param int $meta_id ID of the metadata entry to delete.
+ */
+ do_action( "delete_{$meta_type}meta", $meta_id );
+ }
+
+ // Run the query, will return true if deleted, false otherwise
+ $result = (bool) $wpdb->delete( $table, array( $id_column => $meta_id ) );
+
+ // Clear the caches.
+ wp_cache_delete($object_id, $meta_type . '_meta');
+
+ /** This action is documented in wp-includes/meta.php */
+ do_action( "deleted_{$meta_type}_meta", (array) $meta_id, $object_id, $meta->meta_key, $meta->meta_value );
+
+ // Old-style action.
+ if ( 'post' == $meta_type || 'comment' == $meta_type ) {
+ /**
+ * Fires immediately after deleting post or comment metadata of a specific type.
+ *
+ * The dynamic portion of the hook, `$meta_type`, refers to the meta
+ * object type (post or comment).
+ *
+ * @since 3.4.0
+ *
+ * @param int $meta_ids Deleted metadata entry ID.
+ */
+ do_action( "deleted_{$meta_type}meta", $meta_id );
+ }
+
+ return $result;
+
+ }
+
+ // Meta id was not found.
+ return false;
+}
+
+/**
+ * Update the metadata cache for the specified objects.
+ *
+ * @since 2.9.0
+ *
+ * @global wpdb $wpdb WordPress database abstraction object.
+ *
+ * @param string $meta_type Type of object metadata is for (e.g., comment, post, or user)
+ * @param int|array $object_ids Array or comma delimited list of object IDs to update cache for
+ * @return array|false Metadata cache for the specified objects, or false on failure.
+ */
+function update_meta_cache($meta_type, $object_ids) {
+ global $wpdb;
+
+ if ( ! $meta_type || ! $object_ids ) {
+ return false;
+ }
+
+ $table = _get_meta_table( $meta_type );
+ if ( ! $table ) {
+ return false;
+ }
+
+ $column = sanitize_key($meta_type . '_id');
+