Create & Extend Reusable Base Controller in CodeIgniter
![](https://iamarunchaitanyajami.com/wp-content/uploads/2024/06/1663052052514.png)
In CodeIgniter, you can create a base controller and then extend it to other controllers as a Reusable Base Controller. This approach is useful for sharing common functionality, like loading models, setting common properties, or including utility methods.
Here’s how you can do it:
Step 1: Create the Base Controller
- Create a new PHP file for your base controller in the
application/core
directory. Let’s name itMY_Controller.php
. - Define the base controller class. This class should extend
CI_Controller
.
<?php
defined('BASEPATH') OR exit('No direct script access allowed');
class MY_Controller extends CI_Controller {
public function __construct() {
parent::__construct();
// Load common models, libraries, helpers, etc.
$this->load->model('User_model');
// Additional common setup
}
// Add any common methods you want to use in all controllers
protected function render($view, $data = array()) {
$this->load->view('header', $data);
$this->load->view($view, $data);
$this->load->view('footer', $data);
}
}
Step 2: Extend the Base Controller in Your Controllers
- Modify your existing controllers to extend
MY_Controller
instead ofCI_Controller
.
![](https://iamarunchaitanyajami.com/wp-content/uploads/2024/06/CodeIgniter_Logo-1024x168.png)
User Controller Example
- Create or modify the controller in the
application/controllers
directory. Let’s useUser.php
as an example.
<?php
defined('BASEPATH') OR exit('No direct script access allowed');
class User extends MY_Controller {
public function __construct() {
parent::__construct();
// User-specific setup
}
public function show($id) {
$data['user'] = $this->User_model->get_user_by_id($id);
$this->render('user_view', $data);
}
public function index() {
$data['users'] = $this->User_model->get_all_users();
$this->render('users_view', $data);
}
}
Step 3: Create Views (If Necessary)
Ensure your view files are set up correctly in the application/views
directory.
Example View Files
user_view.php
<!DOCTYPE html>
<html>
<head>
<title>User Details</title>
</head>
<body>
<h1>User Details</h1>
<?php if ($user): ?>
<p>ID: <?php echo $user['id']; ?></p>
<p>Name: <?php echo $user['name']; ?></p>
<p>Email: <?php echo $user['email']; ?></p>
<?php else: ?>
<p>User not found.</p>
<?php endif; ?>
</body>
</html>
users_view.php
<!DOCTYPE html>
<html>
<head>
<title>All Users</title>
</head>
<body>
<h1>All Users</h1>
<?php if ($users): ?>
<ul>
<?php foreach ($users as $user): ?>
<li><?php echo $user['name']; ?> (<?php echo $user['email']; ?>)</li>
<?php endforeach; ?>
</ul>
<?php else: ?>
<p>No users found.</p>
<?php endif; ?>
</body>
</html>
header.php
<!DOCTYPE html>
<html>
<head>
<title>My Application</title>
</head>
<body>
footer.php
</body>
</html>
Summary
- Create a base controller (
MY_Controller.php
) inapplication/core
. - Extend the base controller in your specific controllers (
User.php
). - Use common methods defined in the base controller in your specific controllers.
By following these steps, you can create a base controller in CodeIgniter and extend it in other controllers, allowing for code reuse and better organization of common functionality.
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