SOAP is an XML-based protocol for messaging and RPC-style communication between two processes. The World Wide Web Consortium's XML Protocol (XP) Working Group is working on a SOAP standard, which will be called XP.
The SOAPX4 (Simple Object Access Protocol) implementation for PHP is at http://dietrich.ganx4.com/soapx4.
Alternate SOAP implementation is at http://sourceforge.net/projects/phpxmlp.
Krysalis is the XML/XSLT publishing engine, inspired from Cocoon but adapted to the PHP technology.
InterAKT has developed Krysalis to achieve what the next generation of web services have to offer - the complete separation of the information, application logic and presentation layer.
Krysalis is an open-source PHP development platform, based on the XML/XSLT core. It reused most of PHAkt code to create the Krysalis taglib library.
Major features are:
Please visit the Krysalis site for more information http://www.interakt.ro/products/Krysalis.