public function actionLogin()
 {
     $model = new LoginForm();
     $model->load(Yii::$app->request->post());
     if ($model->validate()) {
         if ($model->validatePassword()) {
             $model->login();
             $this->redirect('/register/index');
         }
     }
     return $this->render('login', ['model' => $model]);
 }
 public function loginWithCredentials($username, $password)
 {
     $loginModel = new LoginForm();
     $loginModel->username = $username;
     $loginModel->password = $password;
     if (!$loginModel->validate()) {
         $ex = new ValidationException();
         $ex->setData($loginModel->errors);
         throw $ex;
     }
     if (!$loginModel->login()) {
         throw new BusinessException("Invalid Credentials");
     }
     return true;
 }