This is what my host says:
PHP (officially "PHP: Hypertext Preprocessor") is a server-side HTML-embedded scripting language. It is extemely popular to use with mySQL and other databases.
CommuniTech.Net is currently offering PHP version 3.0.9 and 4.0.3pl1. PHP 4.0.3pl1 is currently installed as a CGI binary, while PHP 3.0.9 is compiled into Apache. Below are the paths to PHP version 4.0.3pl1:
/usr/bin/php4
For backwards compatibility, PHP 3.0.6 is also available in:
/usr/bin/php
And PHP 3.0.9 is also available in:
/usr/local/php/php3.0.9