Description:
------------
the object's method was called as 'call back' function

Reproduce code:
---------------
<?php
class hello {
  var $me;
  function hello() {
    $this->me = 1;
    register_shutdown_function(array(&$this, 'show'));
  }
  function show() {
    echo $this->me . "\n";
  }
  function add() {
    $this->me++;
  } 
}
$h = new hello;
$h->add();
echo "real value: ";
$h->show();
echo "cb value: ";
?>

Expected result:
----------------
real value: 2
cb value: 2

Actual result:
--------------
real value: 2
cb value: 1