Description:
------------
When using extend to extend a class . Static variables are not  inherited .

Reproduce code:
---------------
class a
{
        public static $myvar;
        public function __construct()
        {
                $this->myvar = '1';
                echo ' Set myvar to 1 ... ' . "\n";
                var_dump($this);
        }
}

$a =  new a();
class b extends a
{
        function __construct()
        {
                echo 'DUmping from class b' . "\n";
                var_dump($this);
        }
}
$a = new b();
?>

Expected result:
----------------
 Set myvar to 1 ... 
object(a)#1 (1) {
  ["myvar"]=>
  string(1) "1"
}
Dumping from class b
object(b)#2 (1) {
  ["myvar"]=>
  string(1) "1"
}


Actual result:
--------------
 Set myvar to 1 ... 
object(a)#1 (1) {
  ["myvar"]=>
  string(1) "1"
}
Dumping from class b
object(b)#2 (0) {
}