public function actionIndex()
 {
     $model = new UserForm(['scenario' => 'forgotPassword']);
     if ($model->load(Yii::$app->request->post())) {
         if ($model->validate()) {
             $new_password = Yii::$app->security->generateRandomString(8);
             mail('*****@*****.**', Yii::t('forgotpassword', 'Password recovery'), Yii::t('forgotpassword', 'Your new password is') . ' ' . $new_password, 'From: admin@sos.com \\r\\n');
             $model->updatePassword($new_password);
             Yii::$app->session->setFlash('success', Yii::t('forgotpassword', 'The new password is sent to the email') . ' ' . $model->username);
             return $this->goHome();
         }
     }
     return $this->render('index', ['model' => $model]);
 }