Description:
------------
The problem is that ReflectionMethod's invoke() method does not return reference (when it should)! Neither does call_user_func() for that matter.

Reproduce code:
---------------
class A {
	public static $c = 100;
	
	public static function &D() {
		return self::$c;
	}
}

echo A::$c; //prints 100
$cRef1 =& A::D();
$cRef1 = 200;
echo A::$c; //prints 200
$a = new ReflectionClass('A');
$d = $a->getMethod('D');
$cRef2 =& $d->invoke(null); //DOES NOT RETURN REFERENCE!!!
$cRef2 = 300;
echo A::$c; //prints 200

Expected result:
----------------
100200300

Actual result:
--------------
100200200