This is a little demo code to go along with my PHP 101 Project: Building a Guestbook.
This page gives you all of the information you should need to build your own (as long as you have access to a webserver with PHP and SQL).
Anyone is free to use this for their own project.
The file included called guestbook.sql holds the database schema for the project, but the tutorial linked above also goes over how to set this up.