Description:
------------
Cannot access original objects by call by reference.

function tryCallback(&$ref){
  $ref =& $this->object;  
}


Only a copies work:

function tryCallback(&$ref){
  $ref = $this->object;  
}


Reproduce code:
---------------
<?php
class myObject{ var $value = 'The original value'; }
function tryCallback(&$ref){
  global $object;
  $ref =& $object;  // in a class it would be: $ref =& $this->object;
  dump($ref, 'Before the proplem: The object is still here but will fail from outside.');
}
function dump($var, $name){
  print '<p  style="background:#eeeeee;">' . $name . '</p>';
  if($var){ print '<pre style="color:green">'; print_r($var); print '</pre>'; }
  else{ print '<p style="color:red"><strong>$var is empty!!!</strong></p>'; }
}
$object = new myObject();
tryCallback($callback);
dump($callback, 'Here the object is missing in my test.');
$callback->value = 'Try to set a value.';
dump($callback, 'Ooops, what a funny object now.');
dump($object, 'This is the original object. Unaltered. No reference was created.');
?>

Expected result:
----------------
Dump 1:

myObject Object
(
    [value] => The original value
)

Dump 2:

myObject Object
(
    [value] => The original value
)

[...]

Actual result:
--------------
Dump 1:

myObject Object
(
    [value] => The original value
)

Dump 2:

$var is empty!!!

[...]