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 product.php in models folder as below:

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

class Product
{

    var $id;
    var $name;
    var $price;

    function __construct($id, $name, $price)
    {
        $this->id = $id;
        $this->name = $name;
        $this->price = $price;
    }
}

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

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

require 'product.php';

class Product_model extends CI_Model
{

    function find()
    {
        return new Product('p01', 'name 1', 2, 3, 'thumb1.gif');
    }

    function findAll()
    {
        $product1 = new Product('p01', 'name 1', 2);
        $product2 = new Product('p02', 'name 2', 7);
        $product3 = new Product('p03', 'name 3', 5);
        $products = array($product1, $product2, $product3);
        return $products;
    }
}

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

$autoload['model'] = array('Product_model' => 'productModel');

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()
    {
        /* Session Data */
        $this->session->set_userdata('age', 10);
        $this->session->set_userdata('username', 'PMKLab');

        /* Session Array Data */
        $account = array(
            'username' => 'pmk',
            'fullName' => 'PMK Lab'
        );
        $this->session->set_userdata('account', $account);

        /* Session Object Data */
        $this->session->set_userdata('product', serialize($this->productModel->find()));

        /* Session Object List Data */
        $this->session->set_userdata('products', serialize($this->productModel->findAll()));

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

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 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>Session Data</h3>
		Age: <?php echo $this->session->userdata('age'); ?>
		<br>
		Username: <?php echo $this->session->userdata('username'); ?>

		<h3>Session Array Data</h3>
		<?php
		  $account = $this->session->userdata('account');
		?>
		Username: <?php echo $account['username']; ?>
		<br>
		Full Name: <?php echo $account['fullName']; ?>

		<h3>Session Object Data</h3>
		<?php
		  $product = unserialize($this->session->userdata('product'));
		?>
		Id: <?php echo $product->id; ?>
		<br>
		Name: <?php echo $product->name; ?>
		<br>
		Price: <?php echo $product->price; ?>

		<h3>Session Object List Data</h3>
		<?php
		  $products = unserialize($this->session->userdata('products'));
		?>
		<table border="1" cellpadding="2" cellspacing="2">
			<tr>
				<th>Id</th>
				<th>Name</th>
				<th>Price</th>
			</tr>
			<?php foreach($products as $product) { ?>
				<tr>
					<td><?php echo $product->id; ?></td>
					<td><?php echo $product->name; ?></td>
					<td><?php echo $product->price; ?></td>
				</tr>
			<?php } ?>
		</table>

	</body>
</html>

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

Output

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

Set BASE URL

Create Product Entity

Create Product Model

AutoLoad Product Model

AutoLoad Libraries

Create Controller

Set Default Controller

Create View

Structure of CodeIgniter Project

Run Application

References