yii框架非法登陆

 //非法登陆

       //定义构造方法， 传参id，$models=null

      public function __construct($id,$models=null){

          parent::__construct($id,$models);

          $session=yii::$app->session;

          $sid=$session['id'];

          if(!$sid){

          //echo "非法登陆";

          //return $this->redirect(array('/index/index/'));

          return $this->redirect('?r=login/index');

          }

      }