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Source View: delete_{$meta_type}_meta

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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
217           $query .= $wpdb->prepare(" AND meta_value = %s", $meta_value );
218
219      $meta_ids = $wpdb->get_col( $query );
220      if ( !count( $meta_ids ) )
221           return false;
222
223      if ( $delete_all )
224           $object_ids = $wpdb->get_col( $wpdb->prepare( "SELECT $type_column FROM $table WHERE meta_key = %s", $meta_key ) );
225
226      do_action( "delete_{$meta_type}_meta", $meta_ids, $object_id, $meta_key, $_meta_value );
227
228      // Old-style action.
229      if ( 'post' == $meta_type )
230           do_action( 'delete_postmeta', $meta_ids );
231
232      $query = "DELETE FROM $table WHERE $id_column IN( " . implode( ',', $meta_ids ) . " )";
233
234      $count = $wpdb->query($query);
235
 
Line Code
483
484      // object and id columns
485      $column = sanitize_key($meta_type . '_id');
486      $id_column = 'user' == $meta_type ? 'umeta_id' : 'meta_id';
487
488      // Fetch the meta and go on if it's found.
489      if ( $meta = get_metadata_by_mid( $meta_type, $meta_id ) ) {
490           $object_id = $meta->{$column};
491
492           do_action( "delete_{$meta_type}_meta", (array) $meta_id, $object_id, $meta->meta_key, $meta->meta_value );
493
494           // Old-style action.
495           if ( 'post' == $meta_type || 'comment' == $meta_type )
496                do_action( "delete_{$meta_type}meta", $meta_id );
497
498           // Run the query, will return true if deleted, false otherwise
499           $result = (bool) $wpdb->delete( $table, array( $id_column => $meta_id ) );
500
501           // Clear the caches.