Now onto the logout. Earlier we left this function blank, now is the time to fill it. In UsersController::logout() add the following:

$this->Session->setFlash('Good-Bye');
$this->redirect($this->Auth->logout());

1. $this->Session->setFlash('Good-Bye');
2. $this->redirect($this->Auth->logout());

This sets a Session flash message and logs out the User using Auth's logout method. Auth's logout method basically deletes the Auth Session Key and returns a url that can be used in a redirect. If there is other session data that needs to be deleted as well add that code here.