public function actionDetails()
 {
     if (Yii::$app->request->isGet) {
         $modelsDetail = new MerBase();
         //实例化商家信息
         $modelsComment = new Comment();
         //实例化评论
         $modelsUser = new Students();
         //实例化用户信息
         $mer_id = Yii::$app->request->get('mer_id');
         $mer_details = $modelsDetail->getDetail($mer_id);
         $comments = $modelsComment->getUserComment($mer_id);
         $pages = $comments['pages'];
         unset($comments['pages']);
         foreach ($comments as $key => $comment) {
             $user_id = $comment['user_id'];
             $comments[$key]['img'] = $modelsUser->getStuDetails($user_id);
         }
         $mer_id = $mer_details['mer_id'];
         $session = yii::$app->session;
         $session->set('mer_id', $mer_id);
         return $this->render('details', ['mer_details' => $mer_details, 'comments' => $comments, 'pages' => $pages]);
     }
 }