check auth session in controller

I have used Auth component in my cakephp site. I want to check whether au开发者_运维问答th session is there or not from controller.

Please help.

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You can access Auth component by $this->Auth from the controller.

$this->Auth->user() will give you the currently authenticated user. The information is taken from the session. If this method returns null, the user is not logged in.