Build Ajax-Based Web sites with PHP
http://www.ibm.com/developerworks/web/library/wa-aj-php/index.html

Ramirez, Ken
IBM
2008

Abstract:

Learn the process of writing Asynchronous JavaScript + XML (Ajax) applications using native JavaScript™ code and PHP. This article introduces a few different frameworks and application program interfaces (APIs) that reduce the amount of code you need to write to achieve a complete Ajax-based Web application.