Here is my simple example:
Code printing variable of class which instatiates the printing class.

Well, I am sure you understand when looking at the code:
Print result is: jippii

<?php
class A {

        function something() {
                $s = debug_backtrace();
                
                $callingObject = $s[1]['object']; 
                $test = $callingObject->jip;
                print $test;
        }

}

class B {
      var $jip; 
      
        function execute() {
                $a = new A();
                $this->jip = "jippii";  
                $a->something(); 
        }

}
$control = new B();
$control->execute();
?>