Description:
------------
While building up a tree structure, i got strange troubles with some broken references. 
I used an array as stack holding references to objects. Some references within the object were broken after using a reference returned by array_pop.
PHP 4.3.2-r4
(Apache/1.3.28)

Reproduce code:
---------------
class Gnaa {
	var $something;
	var $name;
	function Gnaa( $name ) { $this->name = $name;}
	
	function setGnaa( &$something ) { $this->something = &$something; }
	function &getGnaa() { return $something; }
}

$a =& new Gnaa("a");
$stack[] = &$a;

$b =& new Gnaa("b");
$stack[] = &$b;

$child = &array_pop($stack); // should be &$b
$child->setGnaa( &$a );

print_r($child); // output differs!
print_r( $b );   // 


Expected result:
----------------
That $b has the reference to $a, because $child should be a reference to $b.