Simple Login with CodeIgniter in PHP

Simple Login with CodeIgniter

CodeIgniter is an open source web application MVC structure Framework built in PHP designed to make your life as a programmer easier. CodeIgniter allowing good speed and good performance when the site up and running. CodeIgniter details already previous post discussed CodeIgniter.

CodeIgniter Login Database

CREATE TABLE `users` (
`id` tinyint(4) NOT NULL AUTO_INCREMENT,
`username` varchar(10) NOT NULL,
`password` varchar(100) NOT NULL,
PRIMARY KEY (`id`)
) ENGINE=MyISAM DEFAULT CHARSET=latin1 AUTO_INCREMENT=1 ;

insert into users (username, password) values ('dev2tricks', MD5('secret'));
or
insert into users (username, password) values ('dev2tricks', base64('secret'));

Configure CodeIgniter

Database Access

Update the file application/config/database.php in your CodeIgniter installation with your database info:

$db['default']['hostname'] = 'localhost';
$db['default']['username'] = 'yourdbusername';
$db['default']['password'] = 'yourdbpassword';
$db['default']['database'] = 'yourdbname';

Default Controller

We need to tell CodeIgniter to land into our login page instead of the default welcome page. Update the file application/config/routes.php in your CodeIgniter installation with you controller’s name. We’ll call our landing controller login.

$route['default_controller'] = "login";

Libraries

In the file application/config/autoload.php you can configure the default libraries you want to load in all your controllers.

$autoload['libraries'] = array('database','session');
$autoload['helper'] = array('url');

Model (application/models/user.php)

<?php

Class User 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;
}
}
}
?>

<?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'));
$this->load->view('login');
}

}

?>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title>Simple Login with CodeIgniter</title>
</head>
<body>
<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>

<?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;
}
}
}
?>

and Codeigniter database Table access insert,update delete click here