Description:
------------
this code prints instance of object "b" and doesn't throw any errors or exceptions. If a::stat has modificator "static" it says "Notice: Undefined variable: this" and prints null.

Reproduce code:
---------------
class a
{
	public function stat()
	{
	    var_dump($this);
	}
}

class b
{
	public function test()
	{
		a::stat();
	}
}

$b= new b();
$b->test();


Expected result:
----------------
throws some errors or exceptions. 

Actual result:
--------------
prints instance of object "b"