Description:
------------
when a class which extends a parent class with a method which define a static variable is created then a condition is verified, the static variable is not reset in the chield class.

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

abstract class singleton
{
	public static function getInstance()
	{
		static $instance = null;

		if ($instance === null)
		{
			$instance = new static();
		}

		return $instance;
	}

	protected function __construct() {}
	protected function __clone() {}
}

class a extends singleton {
}

var_dump(a::getInstance());

if (1 > 0)
{
	class b extends a {}
}

var_dump(b::getInstance());

?>

Expected result:
----------------
object(a)#1 (0) {
}
object(b)#2 (0) {
}    

Actual result:
--------------
object(a)#1 (0) {
}
object(a)#1 (0) {
}