items = []; } /** * Register a new item. * * @param $instance - Item instance. * @param string $id - Optional - For BC - Deprecated. * * @return boolean - Whether the item was registered. */ public function register( $instance, $id = null ) { // TODO: For BC. Remove in the future. if ( ! $id ) { // Get the ID or default to the class name. $id = ( method_exists( $instance, 'get_id' ) ) ? $instance->get_id() : get_class( $instance ); } if ( $this->get( $id ) ) { return false; } $this->items[ $id ] = $instance; return true; } /** * Get an item by ID. * * @param string $id * * @return array|null */ public function get( $id = null ) { if ( ! $id ) { return $this->items; } return isset( $this->items[ $id ] ) ? $this->items[ $id ] : null; } }