Kris Hadlock has written a well tutorial, How To Create an RSS Aggregator with PHP and AJAX on informit.com. Imagine using a simple HTML file to send a request to a server-side script, receive a custom XML file based on that request, and then display it to the user without ever refreshing the browser! Kris Hadlock explains how to use a combination of PHP and AJAX to create real-time data transfers in any application without a browser refresh.

The contents include
1. Creating the Form To Make the Request.
2. Creating the Custom PHP Object.
3. GET and POST with AJAX.
4. Parsing the Response.