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Saturday, June 8, 2013

Login Page With CodeIgniter Framework in PHP

Login Page With CodeIgniter Framework in PHP

1. Database table

CREATE TABLE IF NOT EXISTS `users` (
  `id` int(11) NOT NULL AUTO_INCREMENT,
  `username` varchar(255) NOT NULL,
  `password` varchar(255) NOT NULL,
  PRIMARY KEY (`id`)
) ENGINE=InnoDB  DEFAULT CHARSET=latin1 AUTO_INCREMENT=2 ;

 INSERT INTO `users` (`id`, `username`, `password`) VALUES
(1, 'admin', 'admin');

2. Set application\config\routes.php
$route['default_controller'] = "login";
$route['404_override'] = '';

3. set autoload application\config\autoload.php
$autoload['libraries'] = array('database', 'session');

4. set the encryption_key
application\config\config.php
$config['encryption_key'] = 'REALLY_LONG_NUMBER';

Create Model application\models\user.php


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<?php
Class User extends CI_Model
{
 function login($username, $password)
 {
   $this -> db -> select('username, password');
   $this -> db -> from('users');
   $this -> db -> where('username = ' . "'" . $username . "'");
   $this -> db -> where('password = ' . "'" . $password . "'");
   $this -> db -> limit(1);
   
   $query = $this -> db -> get();
 
   if($query -> num_rows() == 1)
   {
     return $query->result();
   }
   else
   {
     return false;
   }
 }
}
?>
Create a controller application\controllers\login.php
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<?php if ( ! defined('BASEPATH')) exit('No direct script access allowed');
 
class Login extends CI_Controller {
  
function __construct()
 {
  parent::__construct();
 }
  
 function index()
 {
   $this->load->helper(array('form', 'url'));
   $this->load->view('login_view');
 }
  
}
  
?>
Create the home controller application\controllers\home.php
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<?php if ( ! defined('BASEPATH')) exit('No direct script access allowed');
session_start(); //we need to call PHP's session object to access it through CI
class Home extends CI_Controller {
 
 function __construct()
 {
   parent::__construct();
 }
  
 function index()
 {
   if($this->session->userdata('logged_in'))
   {
     $session_data = $this->session->userdata('logged_in');
     $data['username'] = $session_data['username'];
     $this->load->view('home_view', $data);
   }
   else
   {
     //If no session, redirect to login page
     redirect('login', 'refresh');
   }
 }
   
 function logout()
 {
   $this->session->unset_userdata('logged_in');
   session_destroy();
   redirect('home', 'refresh');
 }
  
}
  
?>
Create the view controllers\login_view.php
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<html xmlns="http://www.w3.org/1999/xhtml">
 <head>
   <title>Simple Login with CodeIgniter</title>
 </head>
 <body bgcolor="pink">
   <h1>Simple Login with CodeIgniter</h1>
   <?php echo validation_errors(); ?>
   <?php echo form_open('verifylogin'); ?>
      <label for="username">Username:</label>
      <input type="text" size="20" id="username" name="username"/>
      <br/>
      <label for="password">Password:</label>
      <input type="password" size="20" id="passowrd" name="password"/>
      <br/>
      <input type="submit" value="Login"/>
    </form>
  </body>
 </html>
VerifyLogin Controller (application/controllers/verifylogin.php)
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<?php if ( ! defined('BASEPATH')) exit('No direct script access allowed');
   
 class VerifyLogin extends CI_Controller {
   
  function __construct()
  {
    parent::__construct();
    $this->load->model('user','',TRUE);
  }
   
  function index()
  {
    //This method will have the credentials validation
   $this->load->library('form_validation');
   
    $this->form_validation->set_rules('username', 'Username', 'trim|required|xss_clean');
    $this->form_validation->set_rules('password', 'Password', 'trim|required|xss_clean|callback_check_database');
   
   if($this->form_validation->run() == FALSE)
    {
      //Field validation failed.  User redirected to login page
     $this->load->view('login_view');
 }
    else
    {
      //Go to private area
      redirect('home', 'refresh');
    }
   
  }
   
  function check_database($password)
  {
    //Field validation succeeded.  Validate against database
    $username = $this->input->post('username');
   
    //query the database
    $result = $this->user->login($username, $password);
   
    if($result)
    {
      $sess_array = array();
      foreach($result as $row)
      {
        $sess_array = array(
          //'id' => $row->id,
          'username' => $row->username
        );
        $this->session->set_userdata('logged_in', $sess_array);
      }
      return TRUE;
    }
    else
    {
      $this->form_validation->set_message('check_database', 'Invalid username or password');
      return false;
    }
  }
 }
 ?>
Create the home view
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<html xmlns="http://www.w3.org/1999/xhtml">
 <head>
   <title>Simple Login with CodeIgniter - Private Area</title>
 </head>
 <body bgcolor="pink">
   <h1>Home</h1>
   <h2>Welcome <?php echo $username; ?>!</h2>
   <a href="home/logout">Logout</a>
  </body>
 </html>
Posted by ednalan at 4:06 AM . Under .

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