Phillip created popular HTML pages that I wanted to add PHP code to, to track the number of hits they’ve been getting. I didn’t want to change the file’s extension or use redirection, so I wondered if it was possible for Apache to treat HTML files as PHP files; it is: add the following to your httpd.conf file:
AddType application/x-httpd-php .htm
AddType application/x-httpd-php .html
Works like a charm. You could use that technique to hide the fact that your website is using PHP to process your pages.