CodeIgniter Controller Tutorial

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What is a Controller?

In CodeIgniter, a Controller is a PHP class that acts as the middleman between the user (browser) and your application logic.

It receives requests from the browser, processes them (using models if needed), and then loads the appropriate view.

Controller Structure

Controllers are stored in:
application/controllers/ (CodeIgniter 3)
app/Controllers/ (CodeIgniter 4)
File name must match the class name.
The class name should start with a capital letter.

Example

<?php

namespace App\Controllers;

class Home extends BaseController

{

public function index()

{

return view('welcome_message', [

'message' => 'Welcome to CodeIgniter 4!'

]);

}

Passing Data to Views

Example

public function about()

{

return view('about_view', [

'message' => 'About Us Page'

]);

}

Controller Action Return Types

1. Normal Website Pages (Views)

return view('page_view', $data);

2. Redirect to Another Route

return redirect()->to('/dashboard');

3. Return JSON (API)

public function getData()
{
  return $this->response->setJSON(['a', 'b', 'c']);
}

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