public function actionIndex()
 {
     $error = '';
     $model = new AnketForm();
     if ($model->load(Yii::$app->request->post())) {
         if ($code = $model->validateCode()) {
             if ($model->processCode($code)) {
                 $this->redirect(['/site/welcome']);
             } else {
                 $this->redirect(['/site/index']);
             }
         } else {
             $error = $model->getLastErrorMessage();
         }
     }
     return $this->render('index', ['model' => $model, 'error' => $error]);
 }