Question

Given that my class looks like this:

class Methods{
    function a(){
        return 'a';
    }

    function b(){  
        $this->a();   
    }

    function c(){ 
        $this->a();
    }  
}

Is it possible to ensure that function a can only be called from function b?

In the above example function c should fail. I could just include it in function b, but in the future I may want to let a() be called by some new functions (e.g. d() or e())

Answer 1

Start by learning the difference between public, private and protected methods… it’s useful to have at least a grasp of OOP basics before wanting to do something incredibly complicated like this.
Yes, it’s possible using debug_backtrace() to identify where the call to the method was made from; but it’s a very big overhead…. and I see no value in actually setting such a restriction.