Description:
------------
get_class_vars() fails to return in-scope private properties that have been shadowed in a child-class.

This report is essentially the same as bug #46812, which has been incorrectly closed after an tangentially related documentation issue has been fixed.

Test script:
---------------
<?php

class A {
    private $foo = "a";

    public static function getClassVars() {
        var_dump(get_class_vars(B::class));
    }
}
class B extends A {
    private $foo = "b"; // comment me out
}

A::getClassVars();

Expected result:
----------------
array(1) {
  ["foo"]=>
  string(1) "a"
}

Actual result:
--------------
array(0) {
}