frontend\controllers\SiteController::actionLogin PHP Method

    public function actionLogin()
    {
        if (!Yii::$app->user->isGuest) {
            return $this->goHome();
        }
        $model = new LoginForm();
        if ($model->load(Yii::$app->request->post()) && $model->login()) {
            return $this->goBack();
        } else {
            return $this->render('login', ['model' => $model]);
        }
    }

 /**
  * Creates a new Blog model.
  * If creation is successful, the browser will be redirected to the 'view' page.
  * @return mixed
  */
 public function actionCreate()
 {
     if (Yii::$app->user->can('create-blog')) {
         $model = new Blog();
         if ($model->load(Yii::$app->request->post())) {
             $model->date_create = date('Y-m-d h:m:s');
             $model->user_id = Yii::$app->user->id;
             $model->image = UploadedFile::getInstance($model, 'image');
             if ($model->image && $model->validate()) {
                 $model->image->saveAs($_SERVER['DOCUMENT_ROOT'] . '/frontend/web/uploads/' . $model->image->baseName . '.' . $model->image->extension);
                 $model->image = $model->image->baseName . '.' . $model->image->extension;
             }
             $model->save();
             return $this->redirect('index.php?r=blog/index');
         } else {
             return $this->renderAjax('create', ['model' => $model]);
         }
     } else {
         return parent::actionLogin();
     }
 }