Language
- contact.php
- a simple PHP email contact form
- database.php
- how to connect to a MySQL database and a variety of database functions
System
- info.php
- very basic, print out of the PHP server info
Set up a PHP server to serve the code, possibly a database too.
For Linux, check on how to set up a LAMP server for your distribution.
For Windows, WAMP is a simple solution.
For Mac, there is a web server built in, but MAMP is another solid option.