[FIXED] Extending CakePHP's AppController with functions from other classes

Issue

I wan't to extend the default AppController class by function from another class from the 'library' folder inside the application root.

On this moment I can reach the class and his function by adding a @property declaration above my class definition like below. But when I run the application it's returning a Call to a member function showTest() on boolean exception. Is this because I've not declared a namespace or something in that way?

// Default class inside 'root/src/Controller/'
/**
* Class    AppController
*
* @property testControl $testControl
*
* @package     App\Controller
*/
class AppController extends Controller
{
    public function initialize() {
        parent::initialize();
    }

    public function beforeFilter(Event $event) : void
    {
       $this->testControl->showTest();
    }
}

// The class inside folder 'root/library/' 
class testControl
{
    public function showTest() {
        die("test");
    }
}

Solution

You need to create a new instance of the testControl object before calling the method:-

public function beforeFilter(Event $event) : void
{
    $testControl = new testControl;
    $testControl->showTest();
}

The PHP error you are seeing is because you haven't initiated the object and $this->testControl hasn't been defined.

You will also need to make sure you tell PHP where to find the testControl class by adding a use statement at the top of your file or referencing the namespace when initiating the object.

Answered By - drmonkeyninja