How to find website developed in php or not

Hi friends, Most of the websites are developed in php and extension are changing to static html files using .htaccess files, to find those websites, just place bellow url at browser we can find the information for most of the websites, i am not sure for it will work for all webisites. http://www.anil2u.info/?=PHPE9568F36-D428-11d2-A769-00AA001ACF42 website...