class User extends CI_Controller{
 
    function __construct() {
        parent::__construct();
 
        if ( $this->input->post( 'remember_me' ) ) // set sess_expire_on_close to 0 or FALSE when remember me is checked.
            $this->config->set_item('sess_expire_on_close', '0'); // do change session config
 
        $this->load->library('session');
    }
 
    function login() {
        if ( $this->input->post( 'login_submit' ) ) {
            $username = $this->input->post('username');
            $password = $this->input->post('password');
  
            if ( $this->my_model->check_login( $username, $password ) ) { 
 
                // do login success action as usual
 
            } else {
 
                // login failed handling here   
 
            }
        }
 
        // load view
        $this->load->view('simple_login_view');
    }
}