<?php if ( ! defined('BASEPATH')) exit('No direct script access allowed');
class Login extends CI_Controller {
function __construct()
{
parent::__construct();
$this->load->model('login_model','',TRUE);    }
public function index() {
$this->load->helper('form');
$this->load->library('form_validation');
$this->form_validation->set_rules('username', 'Username', 'required');
$this->form_validation->set_rules('password', 'Password', 'required');
if ($this->form_validation->run() == FALSE) {
if (isset($this->session->userdata['id'])) {
        redirect('home/profile');
    } else {

        //else it will redirect you to login page.
        $this->load->view('templates/header');
        $this->load->view('login');
         $this->load->view('templates/footer');
    }
} else {
    //if it's a post request with valid data it will validate data in database.
    $username = $this->input->post('username');
    $password = md5($this->input->post('password'));
    $result = $this->login_model->login($username, $password);
    //This condition redirect you to homepage if you entered valid credentials
    if (count($result) !== 0) {
        $this->session->set_userdata('id', $username);
        redirect('home/profile');
    } else {
        //This will redirect you to login page with error.
        $this->session->set_flashdata('message', 'Login Fail!!<br>Invalid username or password!!');
        redirect('login');
    }    }    }    }    ?>

<?php if ( ! defined('BASEPATH')) exit('No direct script access allowed');
class Login_model extends CI_Model
function login($username, $password)
$this->db->select('id','username','password');
$this->db->from('users');
$this->db->where('username', $username);
$this->db->where('password', md5($password));
$this->db->limit(1);
$query = $this->db->get();
if($query->num_rows()>1){
  return $query->result();
}
 else{
   return false;}    }     }