Description:
------------
I could call and change static variable from object or from class

Reproduce code:
---------------
class A{
    public static $pp;
    public function ch(){
	$this->pp+=2;
	print $this->pp.'<br>';
    }
}
$b = new A();
$b->ch();
print $b->pp;


Expected result:
----------------
I expected error

Actual result:
--------------
output is:
2
2