"Announce: Personal Home Page Tools (PHP Tools)". comp.infosystems.www.authoring.cgi . (Web link) . Retrieved 2006-09-17 . ^ " Zend Engine version 2.0: Feature Overview and Design". Zend Technologies Ltd. . Retrieved 2006-09-17 . [ dead link ] ^ a b "php.net 2007 news archive" . The PHP Group. 2007-07-13 . Retrieved 2008-02-22