Source View: delete_{$meta_type}_metadata

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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

Line Code
324       *
325       * @param null|bool $delete     Whether to allow metadata deletion of the given type.
326       * @param int       $object_id  Object ID.
327       * @param string    $meta_key   Meta key.
328       * @param mixed     $meta_value Meta value. Must be serializable if non-scalar.
329       * @param bool      $delete_all Whether to delete the matching metadata entries
330       *                              for all objects, ignoring the specified $object_id.
331       *                              Default false.
332       */
333      $check = apply_filters( "delete_{$meta_type}_metadata", null, $object_id, $meta_key, $meta_value, $delete_all );
334      if ( null !== $check )
335           return (bool) $check;
336
337      $_meta_value = $meta_value;
338      $meta_value = maybe_serialize( $meta_value );
339
340      $query = $wpdb->prepare( "SELECT $id_column FROM $table WHERE meta_key = %s", $meta_key );
341
342      if ( !$delete_all )