frontend\controllers\SiteController::actionContact PHP Method

    public function actionContact()
    {
        $model = new ContactForm();
        if ($model->load(Yii::$app->request->post()) && $model->validate()) {
            if ($model->sendEmail(Yii::$app->params['adminEmail'])) {
                Yii::$app->session->setFlash('success', 'Thank you for contacting us. We will respond to you as soon as possible.');
            } else {
                Yii::$app->session->setFlash('error', 'There was an error sending your message.');
            }
            return $this->refresh();
        } else {
            return $this->render('contact', ['model' => $model]);
        }
    }