Add code to function from another controller - php

Question

In CodeIgniter framework i have two controller files:
controllerA.php and controllerB.php
I need controllerB.php to add code in controllerA.php function
I have no idea how to do it, i checked Codeigniter manual, google and stackoverflow but was not able to find solution
controllerA.php has function:
function get_permission_conditions()
{
return do_action('staff_permissions_conditions', [
'contracts' => [
'view' => true,
'view_own' => true,
'edit' => true,
'create' => true,
'delete' => true,
]);
}
I want controllerB.php to communicate with controllerA.php and add custom code example:
function get_permission_conditions()
{
//Code from controllerA.php
return do_action('staff_permissions_conditions', [
'contracts' => [
'view' => true,
'view_own' => true,
'edit' => true,
'create' => true,
'delete' => true,
//custom code from controllerB.php goes here
]);
}

Answer 1

You should extend controllerA like this:
class controllerA extends CI_Controller{
// All the function will go here
return do_action('staff_permissions_conditions', [
'contracts' => [
'view' => true,
'view_own' => true,
'edit' => true,
'create' => true,
'delete' => true,
]);
}
class controllerB extends controllerA{
public $permission_array;
function __construct() {
$this->permission_array = $this->do_action(); // Here $permission_array will have the array returned by controllerA's function 'do_action'
}
//custom code from controllerB.php goes here
// You can use $permission all over
}

Answer 2

Create a parent controller for both of the and let them both extend that parent and move that method to that parent and let the parent extend CI_Controller .. pretty much like what you did with MY_Controller ...
That's your C_Controller (Parent controller):
class C_Controller extends CI_Controller
{
public function __construct()
{
parent::__construct();
}
// your methods that will be extended
...
}
That's your A_Controller:
class A_Controller extends C_Controller
{
public function __construct()
{
parent::__construct();
}
}
That's your B_Controller:
class B_Controller extends C_Controller
{
public function __construct()
{
parent::__construct();
}
}