How to extend controller in Codeigniter 4? - codeigniter

Question

How can I create my own core controller in codeigniter 4 like codeigniter 3?

Answer 1

When you say "core" controller I understand you to mean a "base" controller which in CI v3 is often named MY_Controller. If that is what you are asking for it's actually much easier in v4 because of namespaces and the autoloader. Also, there is no need for the trickery of using a prefix like MY_.
Here's just how easy it is. The "base" controller...
File: /application/Controllers/Base.php
<?php namespace App\Controllers;
class Base extends \CodeIgniter\Controller
{
//your code here
}
Then extend the above to create any other controller
File: /application/Controllers/Home.php
<?php namespace App\Controllers;
class Home extends \App\Controllers\Base
{
// Your code here
}
The Home controller will inherit all the properties and methods you define in Base.

Answer 2

You do not need to create another core controller, there is already a core controller provided, which is BaseController.
You need to just extend it to your choice

Answer 3

Try this
<?php namespace App\Core;
use CodeIgniter\Controller;
class Home extends Controller
{
}

Answer 4

see my codes
<?php
namespace Modules\Shared\Controllers;
/**
* Class BaseController
*
* BaseController provides a convenient place for loading components
* and performing functions that are needed by all your controllers.
* Extend this class in any new controllers:
* class Home extends BaseController
*
* For security be sure to declare any new methods as protected or private.
*
* #package CodeIgniter
*/
use CodeIgniter\HTTP\RequestInterface;
use CodeIgniter\HTTP\ResponseInterface;
use CodeIgniter\RESTful\ResourceController;
use Modules\Auth\Config\Services;
use Myth\Auth\AuthTrait;
use Psr\Log\LoggerInterface;
use Modules\Shared\Interfaces\UrlQueryParamInterface;
use Modules\Shared\Libraries\UrlQueryParam;
class ApiController extends ResourceController
{
use AuthTrait;
protected $format = "";
public object $userObject;
public UrlQueryParamInterface $urlQueryParam;
/**
* An array of helpers to be loaded automatically upon
* class instantiation. These helpers will be available
* to all other controllers that extend BaseController.
*
* #var array
*/
protected $helpers = [
'cookie',
'url',
'from',
'filesystem',
'text',
'shared'
];
/**
* Constructor.
*
* #param RequestInterface $request
* #param ResponseInterface $response
* #param LoggerInterface $logger
*/
/**
* #var string
* Holds the session instance
*/
protected $session;
public function __construct()
{
$this->userObject = (object)[];
}
public function initController(RequestInterface $request, ResponseInterface $response, LoggerInterface $logger)
{
// Do Not Edit This Line
parent::initController($request, $response, $logger);
$this->urlQueryParam = new UrlQueryParam($request);
$requestWithUser = Services::requestWithUser();
$this->userObject = $requestWithUser->getUser();
}
}
<?php
namespace Modules\Common\Controllers;
use Modules\Common\Config\Services;
use Modules\Common\Entities\AdvertisementEntity;
use CodeIgniter\HTTP\ResponseInterface;
use Modules\Shared\Controllers\ApiController;
class Advertisement extends ApiController
{
/**
* index function
* #method : GET
*/
public function index()
{
$advertisementEntity = new AdvertisementEntity();
$this->urlQueryParam->dataMap($advertisementEntity->getDataMap());
$advertisementService = Services::advertisementService();
$findAllData = $advertisementService->index($this->urlQueryParam);
return $this->respond([
'data' => $findAllData['data'],
'pager' => $findAllData['pager']
], ResponseInterface::HTTP_OK, lang('Shared.api.receive'));
}
/**
* show function
* #method : GET with params ID
*/
public function show($id = null)
{
$advertisementService = Services::advertisementService();
$findOneData = $advertisementService->show($id);
return $this->respond([
'data' => $findOneData['data'],
'pager' => $findOneData['pager']
], ResponseInterface::HTTP_OK, lang('Shared.api.receive'));
}
/**
* create function
* #method : POST
*/
public function create()
{
$rules = [
'name' => 'required|min_length[3]|max_length[255]',
'link' => 'required',
];
if (!$this->validate($rules)) {
return $this->respond([
'error' => $this->validator->getErrors(),
], ResponseInterface::HTTP_NOT_ACCEPTABLE, lang('Shared.api.validation'));
};
$advertisementEntity = new AdvertisementEntity((array)$this->request->getVar());
$advertisementEntity->enableStatus()->createdAt();
$advertisementService = Services::advertisementService();
$advertisementService->create($advertisementEntity);
return $this->respond([
'insertId' => $advertisementService->getInsertID()
], ResponseInterface::HTTP_CREATED, lang('Shared.api.save'));
}
/**
* update function
* #method : PUT or PATCH
*/
public function update($id = null)
{
if ($this->request) {
//get request from Vue Js
$json = $this->request->getJSON();
if (!isset($id)) {
$id = $json->id;
}
$rules = [
'name' => 'required|min_length[3]|max_length[255]',
'link' => 'required',
];
if (!$this->validate($rules)) {
return $this->respond([
'error' => $this->validator->getErrors(),
], ResponseInterface::HTTP_NOT_ACCEPTABLE, lang('Shared.api.validation'));
}
$advertisementEntity = new AdvertisementEntity((array)$this->request->getVar());
$advertisementEntity->updatedAt();
$advertisementService = Services::advertisementService();
$advertisementService->update($id, $advertisementEntity);
}
return $this->respond([
], ResponseInterface::HTTP_OK, lang('Shared.api.update'));
}
/**
* edit function
* #method : DELETE with params ID
*/
public function delete($id = null)
{
$advertisementService = Services::advertisementService();
$advertisementService->delete($id);
return $this->respond([
], ResponseInterface::HTTP_OK, lang('Shared.api.remove'));
}
}