Why is the current object being returned?

Question

PHP

I am learning MVC.
There are two controllers Controller_AJAX and Controller_Blog. Both are derived from Controller. In the action of the first controller I write, $blog = Controller_Blog::getInstance();
but the Controller_AJAX object is returned. At the same time with other controllers everything works fine.

Answer 1

What's in the getInstance method? Controller_Blog definitely inherits from Controller?
Perhaps this will help

Answer 2

You have a very strange application architecture. I think it's worth digging towards the singleton ... As an option.

Answer 3

Understood. It turns out that use Singleton was separately registered in Controller_User, and for other classes it was registered in the parent Controller class. Accordingly, getInstance returned the parent class, and the current successor of this class was assigned. I registered use Singleton in all controllers and the problem was solved.