How to make a notification when the status changes?

Question

Yii

How to change stouts in one controller. Let's say the admin assigned an order to the designer, then the designer should receive a notification that a new order has appeared.
In frontend/views/layouts/main.php I have already specified the widget

use yii\bootstrap\Alert;
<?= Alert::widget() ?>

And in the designer's controller I display

if ($model->status == 3) {
            Yii::$app->session->addFlash('success', 'Получили новый заказ');
        }

Answer 1

If you plan to make alerts via flash messages, then you should not only write it down but also read it. You can read more about working with flash messages here.