Description:
------------
---
From manual page: http://www.php.net/class.serializable
---

When a Serializable object contains a reference to it self a Segmentation fault 
is caused.

I first encountered this in 5.3.3, then found a binary package for 5.3.5 for my 
distribution. Finally I compiled my own 5.3.6. The segmentation fault persists in 
all three versions.

If the Serializable interface is removed the code works fine. 

Although the fault is reproducible, I found encountered other self-reference 
scenarios where it is not triggered, making this very unpredictable.

Test script:
---------------
class Test implements Serializable {
	public $member, $message;
	
	function __construct($message) {
		$this->message = $message;
	}

	function serialize() {
		return serialize(array($this->message, $this->member));
	}
	
	function unserialize($serialized) {
		list($this->message, $this->member) = unserialize($serialized); 
	}
}

$constructed = new Test("original");
$constructed->member = $constructed; //References to self (in this example pointless, but technically legal)
var_dump($constructed);
$transported = unserialize(serialize($constructed)); // Segmentation fault.

Expected result:
----------------
Clean exit..

Actual result:
--------------
object(Test)#1 (2) {
  ["member"]=>
  *RECURSION*
  ["message"]=>
  string(8) "original"
}
Segmentation fault