Description:
------------
After upgrading to PHP 4.4.1 I started seeing "Fatal error: Call to a member function on a non-object" where previously there had been none.  

It appears that the behaviour of references has changed, so the the reuse of a variable name no longer unassigns that variable name from earlier copies of the previous contents of that variable.  

The attempt at a reproduce code below doesn't actually cause the bug to reproduce, but illustrates the type of code that was causing the problem.  I haven't worked out what feature of my more complex production code is causing the issue, but it wasn't there before upgrading to from 4.3.11 to 4.4.1.

Googling "Fatal error: Call to a member function on a non-object PHP 4.4.1" shows up a few other people who appear to have run into a similar unexpected issue.

Reproduce code:
---------------
Class Foo
{
  var $name;

  function Foo($n) {
    $this->name = $n;
  }

  function getName() {
    return $this->name;
  }
}


$result =& new Foo("First");

$c =& $result;

$b = "Second";

$result =& $b;

print $c->getName();


Expected result:
----------------
"First"

Actual result:
--------------
Attempted reproduce code: "First"

Production code: "Fatal error: Call to a member function on a non-object"

In production, querying the zval of $c finds that it has somehow been set to the value of on the the object's properties... major head-scratcher!  

When I changed the code to remove the variable re-use, like this:

$c =& new Foo("First");

$b = "Second";

$result =& $b;

The problem went away...