In Codeigniter extends one controller into another controller - php

Question

I am using codeigniter(3.1.5) and Ihave two controllers in my application/controllers/ folder. with name controller A and Controller B. I want to extends Controller A in Controller B so that I can use methods of Controller A. But it generates class not found error.
Here is my sample code:
A_Controller.php:
defined('BASEPATH') OR exit('No direct script access allowed');
class A_Controller extends CI_Controller {
public function index()
{
}
public function display(){
echo 'base controller function called.';
}
}
B_Controller.php:
defined('BASEPATH') OR exit('No direct script access allowed');
class B_Controller extends A_Controller {
}
I want to execute display() method of controller A in controller B.
If i put controller A in application/core/ folder and in application/config/config.php file make
$config['subclass_prefix'] = 'A_';
then I can able to access methods of controller A.
Please suggest.
Thanks in advance.

Answer 1

Extending a controller in another controller is not really good. Building with MVC and especially with CI, you have other options to achieve this.
Use a class MY_Controller inside application/core that extends the CI_Controller. Later, all (or some) of your controllers should extend the MY_Controller. In MY_Controller you can have many functions and you can call which function you want in your controller.
Use a library. Write your own library in application/libraries and load it in your controller wherever you want. A library is a class with functionality for your project.
Use a helper. Write your own helper in application/helpers and load it in your controller. A helper should have a general purpose for your application.
In that way, your code will be more flexible and reusable for the future. Messing with 2 Controllers seems bad to me. Remember that with the default Routing system of CI you can be confused.

Answer 2

Try to use following code.
defined('BASEPATH') OR exit('No direct script access allowed');
class B_Controller extends A_Controller {
public function test()
{
$this->display();
}
}

Answer 3

Use construct in controller
defined('BASEPATH') OR exit('No direct script access allowed');
class B_Controller extends A_Controller {
public function __construct() {
parent::__construct();
}
public function test()
{
$this->display();
}
}

Answer 4

I found the solution using including parent controller on child controller like this -
require_once(APPPATH."modules/frontend/controllers/Frontend.php");
then my function like this -
class Home extends Frontend {
function __construct() {
parent::__construct();
}
function index() {
echo $this->test(); //from Frontend controller
}
}
I hope this will help.

Answer 5

add this script in B_Controller :
include_once (dirname(__FILE__) . "/A_Controller.php");
for example B_Controller.php :
defined('BASEPATH') OR exit('No direct script access allowed');
include_once (dirname(__FILE__) . "/A_Controller.php");
class B_Controller extends A_Controller {
}