Source View: update_postmeta

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Understanding Source Code

The best way to understand what a hook does is to look at where it occurs in the source code.

  • Action hooks look like this: do_action( "hook_name" )
  • Filter hooks look like this: apply_filters( "hook_name", "what_to_filter" ).

Remember, this hook may occur in more than one file. Moreover, the hook's context may change from version to version.

Source View

This hook occurs 2 times in this file.

Line Code
238                 * Fires immediately before updating a post's metadata.
239                 *
240                 * @since 2.9.0
241                 *
242                 * @param int    $meta_id    ID of metadata entry to update.
243                 * @param int    $object_id  Object ID.
244                 * @param string $meta_key   Meta key.
245                 * @param mixed  $meta_value Meta value.
246                 */
247                do_action( 'update_postmeta', $meta_id, $object_id, $meta_key, $meta_value );
248           }
249      }
250
251      $result = $wpdb->update( $table, $data, $where );
252      if ( ! $result )
253           return false;
254
255      wp_cache_delete($object_id, $meta_type . '_meta');
256
 
Line Code
696           // Format the where query arguments.
697           $where = array();
698           $where[$id_column] = $meta_id;
699
700           /** This action is documented in wp-includes/meta.php */
701           do_action( "update_{$meta_type}_meta", $meta_id, $object_id, $meta_key, $_meta_value );
702
703           if ( 'post' == $meta_type ) {
704                /** This action is documented in wp-includes/meta.php */
705                do_action( 'update_postmeta', $meta_id, $object_id, $meta_key, $meta_value );
706           }
707
708           // Run the update query, all fields in $data are %s, $where is a %d.
709           $result = $wpdb->update( $table, $data, $where, '%s', '%d' );
710           if ( ! $result )
711                return false;
712
713           // Clear the caches.
714           wp_cache_delete($object_id, $meta_type . '_meta');