Description:
------------
The property_exists function returns true on private properties if called within a class. That doesn't work, if it is called in a function of a parent class. If you overload the function in the childclass it works, but this is actually not the idea behind OOP ;-)

Reproduce code:
---------------
<?
class x {
	private $x;
	public function prop ($p) {
		return property_exists($this,$p);
	}
}
class y extends x {
	private $y;
}
$x = new x;
echo 'prop(x): '.$x->prop('x').'<br>';
$y = new y;
echo 'prop(y): '.$y->prop('y').'<br>';
?>

Expected result:
----------------
you should see
prop(x): 1
prop(y): 1

Actual result:
--------------
prop(x): 1
prop(y):