Object references appear to change every time a change is made to the object, at least under NT. This means that you can't store mutable objects inside an array, for example. This is bad!

<?php

class example {

var $a;

function test() {
	$temp=$this;
	$this->a=10;
	return $temp;
	}

}

$c = new example;
$c->a=1;
$result=$c->test();
print($result->a);

# prints out the number 1, not the number 10!!

?>