Description:
------------
Manual says:
"Note: It is not possible to unset $this inside an object method since PHP 5."

Reproduce code:
---------------
<?php

class foo {
  public function __construct() {
    unset($this);
    var_dump($this);
  }
}

new foo;

Expected result:
----------------
object(foo)#1 (0) {
}


Actual result:
--------------
NULL