Beginning Ajax with PHP: From Novice to Professional
From the reviews:"Within the hype of the Web 2.0 movement, Ajax is seen as a star technology. … The book is well organized, and the author’s writing is fairly easy to follow. … For Ajax to work, the Web application user must be using a device capable of processing JavaScript, and JavaScript processing must be enabled. … This book can help someone who wants to get a basic understanding of Ajax and PHP." (Will Wallace, ACM Computing Reviews, Vol. 49 (5), May, 2008)