How to creat remember me checkbox with codeigniter?

[eluser]Unknown[/eluser]
Hello,
I have this code in header to login:

Code:

echo form_open('login');
    echo form_input("email","email");
    echo form_password("password","");
    echo form_submit("ok","ok");
    echo form_hidden('url',current_url());
    echo form_close();

and this is the login function in controller:

Code:

function login(){
        $this->load->model('my_mod');
  
        $email = $this->input->post('email');
        $password = $this->input->post('password');
        $url = $this->input->post('url');
        $user = $this->my_mod->user_exist_employer($email,$password);

        $user = $this->my_mod->user_exist($email,$password);
        if($user!=false){
foreach($user as $user):
        $data = array(
                   'fname'  => $user->fname,
                   'lname'  => $user->lname,
                   'id' => $user->id,
                   'logged_in' => true
               );

        $this->session->set_userdata($data);
endforeach;
        redirect($url);
    }
}

and I wonder how to put checkbox (remember me) like any website.