PHP and CGI

I did some research in the archives on this, but couldn't come up with a straight answer. I have a CGI script that uses and HTML template/form. I would like to embed a PHP script in the template to take some of the values of the CGI and put them in a database. I set up the database, wrote the PHP, but now find that the CGI script apparently won't recognize my PHP. Anyone have any ideas as to what I need to do? The CGI is a preset thing I can't re-write in PHP (at least for now). And I don't know much CGI myself. Thanks! -Mike