In this tutorial we are going to build a little chat program that is really easy to get up and running on any server running PHP. No database is required – as the chat will store itself in a simple text file.
PHP – Will handle all the server side stuff
jQuery/JavaScript – Will handle the client side stuff. This is an AJAX-y application, meaning that messages pop onto the screen (both yours and others) without needing any page refresh.
Text File – Stores the chat