<?php

class Auth extends CI_Controller {

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

    function index()
    {

    }

    function login()
    {
        $this->load->model('auth_model');

        $username = $this->input->post('username');
        $password = $this->input->post('password');

        if ($this->auth_model->validate_login($username, $password))
        {
            // login success

            $this->session->set_userdata('logged_in', TRUE);

            if ($this->auth_model->validate_admin($username))
            {
                $this->session->set_userdata('is_admin', TRUE);
            }
            else
            {
                $this->session->set_userdata('is_admin', FALSE);
            }

            $session_id = $this->session->userdata('session_id');
            if ($this->session->userdata('logged_in'))
            {
                echo 'Logged in!';
                echo "<br>";
                echo $session_id;
            }
        }
        else
        {
            // login failed
            echo 'Login failed';
        }
    }

    function logout()
    {
        $this->session->sess_destroy();

        redirect('home');
    }
}



?>

// auth_model.php ===========================================

<?php

class Auth_model extends CI_Model {

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

    function index()
    {

    }

    function validate_login($username, $password)
    {
        $this->db->where('username', $username);
        $this->db->where('password', md5($password));
        $result = $this->db->get('users');

        if ($result->num_rows() == 1)
        {
            return TRUE;
        }
        else
        {
            return FALSE;
        }
    }

    function validate_admin($username)
    {
        $this->db->where('username', $username);
        $this->db->where('admin', 1);
        $result = $this->db->get('users');

        if ($result->num_rows() == 1)
        {
            return TRUE;
        }
        else
        {
            return FALSE;
        }
    }
}

?>