Operating Systems: - Linux (with Apache)
                   - Win2k (with both Apache and IIS)

I have a script with two object, one that has the reference to the other. Once the objects are initialized I put them in session before the parent and then the child.

If I reload the page, accessing the child object and modifying a property, after 2-3 times I receive a server error on php module.

On IIS:           ACCESS VIOLATION XXXXXX
On Apache(Linux): child pid xxxxx exit signal Segmentation fault

If I invert the two session_register (registering before the child object and then the parent), it all works perfectly.

<?
class Nephew  {
	var $name = "-";
}


class Family {
	var $nephew = null; 

    function setNephew(&$n) {
    	$this->nephew = &$n;
    }

    function toString() {
        if($this->nephew) {
	    	echo "The nephews are " . $this->nephew->name."<br>";
        }
        else {
	        echo "No nephews<br>";
        }
    }
}

session_start();

if(!isset($family)) {
	$family = new Family();
	$nephew = new Nephew();
	$family->setNephew(&$nephew);

        session_register('family');
        session_register('nephew');
}

$nephew->name .= " - ";
?>