CommentController::actionUpdate PHP Method

    public function actionUpdate()
    {
        $model = $this->loadModel();
        if (isset($_POST['ajax']) && $_POST['ajax'] === 'comment-form') {
            echo CActiveForm::validate($model);
            Yii::app()->end();
        }
        if (isset($_POST['Comment'])) {
            $model->attributes = $_POST['Comment'];
            if ($model->save()) {
                $this->redirect(array('index'));
            }
        }
        $this->render('update', array('model' => $model));
    }