PHP SOAP Toolkit
Michael Tutty, a friend and co-worker, gave the below talk at the DC PHP Conference . PHP SOAP Toolkit is a handy way to fill-in some of the "missing" pieces of SOAP support in PHP that make implementing both SOAP services and clients in a way that is inter-operable with other languages like .NET and Java. If you are interested in getting your feet wet with PHP and SOAP particularly with contract-first type of development you can take your WSDL on over here where you can quickly turn it into a downloadable PHP SOAP client that supports code completion.