As we seen in  login page if we click or check the checkbox of  “Remember Me” then our  login id will be remembered by the browser . This is done by using cookies .

our login form contain email field and password along with checkbox name remember me . when we submit our form if this remember me checkbox is checked then we are storing value of user in the cookie.

Below is the Appcontroller logic.

public function beforeFilter() {
        $this->Cookie->httpOnly = true;
        if (!$this->Auth->user() && $this->Cookie->read('rememberMe')) {

            $cookie = $this->Cookie->read('rememberMe');
            //checking cookie is non empty
      
           if(isset($cookie) && !empty($cookie)) {
            
                $user = $this->User->find('first', array(
                        'conditions' => array(
                                'User.username' => $cookie['username'],
                                'User.password' => $cookie['password']
                        )
                ));
            }    
        }
         
    }
}

In below code we are storing user information to cookie if remember me checkbox  is checked .We are setting 1 week as cookie expiration time, so user can be logged in for 1 week.

Below is the user controller logic.

function login(){
    $this->layout="main";

    if ($this->Auth->user())
    {
        $this->redirect(array('controller'=>'users', 'action'=>'home'));
    }
   
   if ($this->request->is('post')){
   
         if ($this->Auth->login()){
           
            if ($this->request->data['User']['rememberMe'] == 1) {
                                    // After what time frame should the cookie expire
                $cookieTime = "1 week"; // You can do e.g: 1 week, 17 weeks, 14 days

                // remove "remember me checkbox"
                unset($this->request->data['User']['rememberMe']);

                // write the cookie
               
                $cookie = $this->request->data['User'];

                $this->Cookie->write('rememberMe', $cookie, true, $cookieTime);

            }
                    
            $this->redirect($this->Auth->redirectUrl());
        }
    
        $this->Flash->error(__('Invalid username or password, try again'));
    }
    $user = $this->Cookie->read('rememberMe');
    $this->set('user', $user); //passing username and password to view
    $this->set('checked', 1);

}