Description:
------------
In bug #48290 was the function get_caller_vars() suggested. But in that case it was irrelevant. However do I seek such a function.

get_defined_vars() returns the vars in the current scope. As do i like to get the variables of the caller routine.

This would allow me to use parameters from a subroutine without having to refactor another parameter being get_defined_vars() as this would obviously uglify my code, which would impeach the reason to refactor in the first place.

Test script:
---------------
function a() {
  $test = 'A';
  b();
}

function b() {
  $test = 'B';
  $vars_local = get_defined_vars();
  $vars_caller = get_caller_vars();

  echo $vars_caller['test']; // Expexted: A
  echo $vars_local['test']; // Expected: B
}

a();

Expected result:
----------------
A
B

Actual result:
--------------
such a function does not exist