yii\helpers\BaseArrayHelper::merge PHP Метод

    public static function merge($a, $b)
    {
        $args = func_get_args();
        $res = array_shift($args);
        while (!empty($args)) {
            $next = array_shift($args);
            foreach ($next as $k => $v) {
                if ($v instanceof UnsetArrayValue) {
                    unset($res[$k]);
                } elseif ($v instanceof ReplaceArrayValue) {
                    $res[$k] = $v->value;
                } elseif (is_int($k)) {
                    if (isset($res[$k])) {
                        $res[] = $v;
                    } else {
                        $res[$k] = $v;
                    }
                } elseif (is_array($v) && isset($res[$k]) && is_array($res[$k])) {
                    $res[$k] = self::merge($res[$k], $v);
                } else {
                    $res[$k] = $v;
                }
            }
        }
        return $res;
    }

 public function actionIndex($search)
 {
     if ($search != null && $search != '') {
         $search = htmlspecialchars($search, ENT_HTML5);
         $activitySearchModel = new ActivitySearchGlobal();
         $activitySearchModel->globalSearch = $search;
         $activitySearchModelDataProvider = $activitySearchModel->search(Yii::$app->request->queryParams);
         $outdoorAttractionSearchModel = new OutsideAttractionSearchGlobal();
         $outdoorAttractionSearchModel->globalSearch = $search;
         $outdoorAttractionDataProvider = $outdoorAttractionSearchModel->search(Yii::$app->request->queryParams);
         $dataProvider = BaseArrayHelper::merge($activitySearchModelDataProvider, $outdoorAttractionDataProvider);
         if (Yii::$app->user->can('postIndex')) {
             $postSearchModel = new PostSearchGlobal();
             $postSearchModel->globalSearch = $search;
             $postDataProvider = $postSearchModel->search(Yii::$app->request->queryParams);
             $dataProvider = BaseArrayHelper::merge($dataProvider, $postDataProvider);
             $postReplySearchModel = new PostReplaySearchGlobal();
             $postReplySearchModel->globalSearch = $search;
             $postReplyDataProvider = $postReplySearchModel->search(Yii::$app->request->queryParams);
             $dataProvider = BaseArrayHelper::merge($dataProvider, $postReplyDataProvider);
         }
         if (Yii::$app->user->can('announcementIndex')) {
             $announcementSearchModel = new AnnouncementSearchGlobal();
             $announcementSearchModel->globalSearch = $search;
             $announcementDataProvider = $announcementSearchModel->search(Yii::$app->request->queryParams);
             $dataProvider = BaseArrayHelper::merge($dataProvider, $announcementDataProvider);
         }
         return $this->render('index', ['input' => $search, 'result' => $dataProvider]);
     } else {
         throw new ForbiddenHttpException(Yii::t('yii', 'Input something'));
     }
 }