This book simply rawks!!!,
This review is from: Professional PHP Web Services (Paperback)
The content in this book simply rawks - all the latest information on how you can do web services using PHP.There is a wealth on information on how you can use PHP and SOAP (using popular libraries such as NuSOAP, PEAR::SOAP and ezSOAP), PHP and SOAP's front-runner (XML-RPC), how you can discover web services using UDDI. Infact, there is a quality library for PHP::UDDI, that was created for the book, and which the authors have very kindly hosted on sourceforge (phpuddi.sourceforge.net/).
This is *the* book on the subject. Check it out today.