Description:
------------
Context visibility of inherited private attributes when they apply 
to child classes.

When a private attribtue is inherited, it's still accessible from 
the context (base class) where it was declared and it becomes 
accessible from the child context (unidirectional visibility).

But when this attribute is static (class attribute), it becomes 
inaccessible from every context : the base class and the child 
class.

I don't know if it's the normal behavior, anyway I find it strange 
and it could be documented.

Thanks

Reproduce code:
---------------
class a {
	private $v ;
	private static $w ;
	function f($c) {
		$c -> v = 'asdf' ;
		$c :: $w = 'fdsa' ;
	}
}
class b extends a {
	function g($c) {
		$c -> v = 'asdf' ;
		$c :: $w = 'fdsa' ;
	}
}
$a = new a() ;
$b = new b() ;

$a-> f($a) ;
$a-> f($b) ;
$b -> f($b) ;
$b -> g($b) ;

Expected result:
----------------
no errors

Actual result:
--------------
A - protected static $w ;

all is ok

B - private static $w ;

1 : $a-> f($a) ; -> ok
2 : $a-> f($b) ; -> Cannot access property b::$w
3 : $b -> f($b) ; -> Cannot access property b::$w
4 : $b -> g($b) ; -> Cannot access property b::$w

2,3,4 : b:$w is accessible from nowhere.

The errors are not :
- Access to undeclared static property
- Cannot access private property