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Learn how to create a controller in CodeIgniter! Step-by-step tutorial covering manual file setup, Spark CLI, and route configuration.
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This content was added on Spotenjin at 03 Feb 2022 and got 1165 visits untill now.
In the Model-View-Controller (MVC) architectural pattern, controllers act as the central orchestrator of web applications. A controller processes incoming HTTP requests from the browser, interacts with database models to fetch or manipulate data, and renders the final view template back to the user. Whether you are building a simple dynamic website or a complex RESTful API, knowing how to properly create, structure, and route new controllers in the CodeIgniter PHP framework is an essential backend development skill.\n\nCodeIgniter 4 simplifies controller creation by utilizing object-oriented principles, namespaces, and strict file-naming rules. Every controller class file must be saved within the primary application directory—located at `app/Controllers/`. Furthermore, class names must follow PascalCase naming conventions (e.g., `ProductController.php`), and the internal PHP class name must exactly match the file name to ensure the framework's Autoloader can locate and execute the script seamlessly.\n\n### How to Create a Controller Manually\n\n1. **Navigate to Controllers Directory:** Open your project files and locate the `app/Controllers/` folder.\n\n2. **Create a New File:** Create a new PHP file named `Products.php` or `ProductController.php`.\n\n3. **Define Class and Namespace:** Open the file and define the `App\\Controllers` namespace. Extend the framework's base controller class (`BaseController`).\n\n4. **Add Controller Methods:** Inside the class, create public methods (actions) like `index()` or `detail()`. Use these methods to load views or process data.\n\nHere is a clean example of a basic controller file:\n\n```php\nget('products', 'Products::index');` maps the `example.com/products` URL directly to the `index()` method inside your `Products` controller. If your controller accepts dynamic parameters like an item ID, use wildcard rules such as `$routes->get('products/(:num)', 'Products::detail/$1');`.\n\nIn addition to standard web controllers, CodeIgniter allows you to organize controllers into subfolders (e.g., `app/Controllers/Admin/Users.php`) for modular project architecture. When placing controllers inside subdirectories, remember to update the namespace declaration accordingly (e.g., `namespace App\\Controllers\\Admin;`) and specify the subfolder path in your routes file (`$routes->get('admin/users', 'Admin\\Users::index');`).\n\nIn conclusion, creating a new controller in CodeIgniter is a fast, straightforward process whether done manually or through Spark CLI commands. By sticking to proper directory structures, extending `BaseController`, and setting clean route bindings, you can build scalable, well-structured backend web applications. To create a controller in CodeIgniter, you will need to follow these steps: Open your CodeIgniter project in your preferred text editor or development environment. Navigate to the "Controllers" folder, which is located in the "application" directory of your project. Create a new PHP file in the "Controllers" folder and give it a name that reflects the purpose of the controller. For example, if the controller will handle user authentication, you might name it "Auth.php". At the top of the file, define the controller class by extending the CodeIgniter "CI_Controller" class. The class name should match the filename, with the first letter capitalized. For example: class Auth extends CI_Controller { } Inside the controller class, define a method (also called an "action") for each function you want the controller to perform. For example, you might define a "login" method to handle user login requests. To access the controller from a web browser, you will need to specify the controller and method in the URL. For example, to access the "login" method of the "Auth" controller, you would use the following URL: http://your-site.com/index.php/auth/login By following these steps, you should be able to create a controller in CodeIgniter and define methods to handle specific functions in your application.
