Destructor not called when extending SimpleXMLElement

Afternoon all. I seem to be having a little trouble with extending the SimpleXMLElement class. I would like to add a destructor to the subclass, but am finding that it is not called. Attached is a minimal demonstration of the problem. The XMLConfig class extends SimpleXMLElement, and its destructor is not called. The XMLConfig2 class, which does not use inheritance, does have its destructor called. The test platform is CentOS 6.2, with PHP version 5.3.3. What am I missing? Thanks for your help. Nick. -- Nick Chalk. Loadbalancer.org Ltd. Phone: +44 (0)870 443 8779 http://www.loadbalancer.org/

Attachment: [application/x-httpd-php] minimal_test.php