Login Form with Session in CodeIgniter Framework

In CodeIgniter Project, Open config.php file in config folder. Set value for base_url config as below:

$config['base_url'] = 'http://localhost:9092/LearnCodeIgniterWithRealApps/';

Create new PHP file named account_model.php in models folder as below:

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

class Account_model extends CI_Model
{

    function login($username, $password)
    {
        return $username == 'pmk' && $password == 'lab';
    }

}

In CodeIgniter Project, Open autoload.php file in config folder and set value for model config as below:

$autoload['model'] = array('Account_model' => 'accountModel');

In CodeIgniter Project, Open autoload.php file in config folder. Add url and form helper to helper config as below:

$autoload['helper'] = array('url', 'form');

In CodeIgniter Project, Open autoload.php file in config folder. Add session library to libraries config as below:

$autoload['libraries'] = array('session');

Create new PHP file named demo.php in controllers folder as below:

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

class Demo extends CI_Controller
{

    public function index()
    {
        $this->load->view('demo/index');
    }

    public function process_login()
    {
        $username = $_POST['username'];
        $password = $_POST['password'];
        if ($this->accountModel->login($username, $password)) {
            $this->session->set_userdata('username', $username);
            $this->load->view('demo/welcome');
        } else {
            $data['error'] = 'Invalid Account';
            $this->load->view('demo/index', $data);
        }
    }

    public function logout() {
        $this->session->unset_userdata('username');
        redirect('demo');
    }

}

In CodeIgniter Project, Open routes.php file in config folder. Set value for default_controller as below:

$route['default_controller'] = 'demo';

Create new folder named demo in views folder. In this folder, create new views as below:

Create new PHP file named index.php as below:

<?php defined('BASEPATH') or exit('No direct script access allowed'); ?>
<html>
	<head>
		<title>Demo Page</title>
	</head>
	<body>

		<h3>Login Form</h3>
		<?php echo isset($error) ? $error : ''; ?>
		<?php echo form_open('demo/process_login'); ?>
    		<table cellpadding="2" cellspacing="2">
    			<tr>
    				<td>Username</td>
    				<td>
    					<input type="text" name="username" required="required">
    				</td>
    			</tr>
    			<tr>
    				<td>Password</td>
    				<td>
    					<input type="password" name="password" required="required">
    				</td>
    			</tr>
    			<tr>
    				<td>&nbsp;</td>
    				<td>
    					<input type="submit" value="Login">
    				</td>
    			</tr>
    		</table>
		<?php echo form_close(); ?>

	</body>
</html>

Create new PHP file named welcome.php as below:

<?php defined('BASEPATH') or exit('No direct script access allowed'); ?>
<html>
	<head>
		<title>Welcome Page</title>
	</head>
	<body>

		Welcome <?php echo $this->session->userdata('username'); ?>
		<br>
		<a href="<?php echo site_url('demo/logout'); ?>">Logout</a>

	</body>
</html>

Access index action in Demo controller with following url: http://localhost:9092/LearnCodeIgniterWithRealApps/demo/index

Output

Test with invalid account is username: abc and password: 123

Output

Test with valid account is username: pmk and password: lab.

Output

Click logout link from success page to remove session and open login page again

Output

I recommend you refer to the books below to learn more about the knowledge in this article:

Set BASE URL

Create Account Model

AutoLoad Account Model

AutoLoad Helpers

AutoLoad Libraries

Create Controller

Set Default Controller

Create View

Index View

Welcome View

Structure of CodeIgniter Project

Run Application

References

Set BASE URL

Create Account Model

AutoLoad Account Model

AutoLoad Helpers

AutoLoad Libraries

Create Controller

Set Default Controller

Create View

Index View

Welcome View

Structure of CodeIgniter Project

Run Application

References

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