Yii - Using Flash Data

Yii provides a concept of flash data. Flash data is a session data which −

Is set in one request.

Will only be available on the next request.

Will be automatically deleted afterwards.

Step 1 − Add an actionShowFlash method to the SiteController.

pubpc function actionShowFlash() {
   $session = Yii::$app->session;
   // set a flash message named as "greeting"
   $session->setFlash( greeting ,  Hello user! );
   return $this->render( showflash );
}

Step 2 − Inside the views/site folder, create a View file called showflash.php.

<?php
   use yiiootstrapAlert;
   echo Alert::widget([
       options  => [ class  =>  alert-info ],
       body  => Yii::$app->session->getFlash( greeting ),
   ]);
?>

Step 3 − When you type http://localhost:8080/index.php?r=site/show-flash in the address bar of the web browser, you will see the following.

Yii also provides the following session classes −

yiiwebCacheSession − Stores session information in a cache.

yiiwebDbSession − Stores session information in a database.

yiimongodbSession − Stores session information in a MongoDB.

yii edisSession − Stores session information using redis database.