Description:
------------
See the attached script. The problem is reproduceable with PHP 4.3.4 on Apache 2.0.48 (Apache and PHP versions that are distributed with Mandrake 10.0).

The problem seems to be caused by method setX(). If I replace that method with
	function setX($x) {
		return $this->x = $x;
	}
or
	function &setX($x) {
		$this->x = $x;
		return $this->x;
	}
I get the expected end result. [Note that the former doesn't return the reference so it isn't equivalent to original code.]

Also note that if I remove the first echo, the result of the second echo is different so it seems that serialize($this) is modifying $this. It might be that object's internal represenation is already trashed, though.


Reproduce code:
---------------
<pre><?php
class foo
{
	function test() {
		$this->setX("28");
		echo "this = ".serialize($this)."\n";
		echo "this->getX() = ".serialize($this->getX())."\n";
	}
	function &setX($x) {
		return $this->x = $x;
	}
	function &getX() {
		return $this->x;
	}
}
$foo =& new foo();
$foo->test();
?></pre>


Expected result:
----------------
this = O:3:"foo":1:{s:1:"x";s:2:"28";}
this->getX() = s:2:"28";


Actual result:
--------------
this = O:3:"foo":1:{s:1:"x";O:3:"foo":1:{s:1:"x";N;}}
this->getX() = O:3:"foo":1:{s:1:"x";O:3:"foo":1:{s:1:"x";R:2;}}