login.php

<?php if ( ! defined('BASEPATH')) exit('No direct script access allowed');

class Login extends CI_Controller {

  function __construct()
  {
    parent::__construct();
  }

  function index()
  {
    if($this->session->userdata('logged_in'))
        {
            redirect('home', 'refresh');
        }
        else
        {
            $this->load->helper(array('form'));
            $this->load->view('login_view');
        }

  }

}

?>