Field_Helper = AD()->Helper; // Save metabox data hook add_action( 'save_post', [ $this, 'save_metabox_data' ] ); } /** * Method register_custom_metabox * * @return void */ abstract public function register_custom_metabox(); /** * Method save_metabox_data * * @param $post_id $post_id * * @return void */ abstract public function save_metabox_data( $post_id ); }