/**
  * return registered widget features
  */
 public static function get_all_features()
 {
     $data = array();
     $features = HW_HOANGWEB::get_classes_by_group('widget-features');
     foreach ($features as $item) {
         $feature_name = trim(self::get_feature_name_byClass($item['class']));
         $data[$feature_name] = $item['alias'];
     }
     return $data;
 }