Description:
------------
When trying to access a member of the threadclass from outside the thread after the thread was joined causes a segfault.

I used the latest git version of the code, since a part of the problem is fixed there already

Test script:
---------------
<?php
class Test3 extends Thread {
    var $x;
    public function run() {
        $this->x = 7;
        sleep(5);
        return 0;
    }
}

$thread3 = new Test2();
$thread3->x = 5;
1echo $thread3->x; //works(5)
$thread3->start();
echo $thread3->x; //works(5 or 7 - racecondition)
sleep(3);
echo $thread3->x; //works(7)
$thread3->join();
echo $thread3->x; //segfault

?>


Expected result:
----------------
5577

Actual result:
--------------
557Segmentation fault: 11 (core dumped)