Description:
------------
callback call private method (in parent class) instead of public method in 
current class

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

class Foo
{
	public function run()
	{
		return call_user_func(array('Bar', 'getValue'));
	}

	private static function getValue()
	{
		return 'Foo';
	}
}

class Bar extends Foo
{
	public static function getValue()
	{
		return 'Bar';
	}
}

$x = new Bar;
$x->run();

Expected result:
----------------
'Bar'

Actual result:
--------------
'Foo'