NuSOAP is a rewrite of SOAPx4, provided by NuSphere and Dietrich Ayala. It is a set of PHP classes - no PHP extensions required - that allow developers to create and consume web services based on SOAP 1.1, WSDL 1.1 and HTTP 1.0/1.1.
Not WS-I compatible. My Java™ cow-orkers complain, and I inherited lots of code using NuSOAP…
Still not useful at all for soap clients that need to implement security. Does not even support soap 1.2. Cannot set the content-type to application/soap+xml. Only good for insecure soap requests, otherwise it just plain doesn't work. Also the caching of the WSDL files doesn't work at all. Using packet sniffers you can watch it constantly request the WSDL files over and over.
Thumbs down I can't send a file with more than 1000bytes.