public function actionUpdateEmailNotification($id)
 {
     $user = $this->_loadUser($id);
     $newValues = array();
     if (!empty($_POST['value'])) {
         $newValues = (array) $_POST['value'];
     }
     $oldValues = UserNotification::model()->findAll('user_id=:user_id', array(':user_id' => $user->id));
     if (!empty($oldValues)) {
         foreach ($oldValues as $key => $value) {
             if (false !== ($key_ar = array_search($value->notification_id, $newValues))) {
                 // get key of $newValues array if value = id
                 $value->by_email = true;
                 $value->save(false);
                 unset($newValues[$key_ar]);
             } else {
                 $value->by_email = false;
                 $value->save(false);
             }
         }
     }
     if (!empty($newValues)) {
         foreach ($newValues as $value) {
             $userNotification = new UserNotification();
             $userNotification->user_id = $user->id;
             $userNotification->notification_id = (int) $value;
             $userNotification->by_email = true;
             if (!$userNotification->save()) {
                 header('HTTP 400 Bad Request', true, 400);
                 echo CJSON::encode($userNotification->errors);
                 Yii::app()->end();
             }
         }
     }
     echo '[]';
 }