code: public static function remember($url = '', $name = null)
      {
          $url = static::to($url);
  
          if ($name === null) {
              Yii::$app->getUser()->setReturnUrl($url);
          } else {
              Yii::$app->getSession()->set($name, $url);
          }
      }
docs: Remembers the specified URL so that it can be later fetched back by [[previous()]].
  
  @param string|array $url the URL to remember. Please refer to [[to()]] for acceptable formats.
  If this parameter is not specified, the currently requested URL will be used.
  @param string $name the name associated with the URL to be remembered. This can be used
  later by [[previous()]]. If not set, [[\yii\web\User::setReturnUrl()]] will be used with passed URL.
  @see previous()
  @see \yii\web\User::setReturnUrl()