Fatal error: Cannot redeclare class soapclient in C:\Program Files\xampp\htdocs\dev\lib\nusoap.php on line 7240

It turns out that PHP5′s own SOAP extension uses soapclient as a class name. The easy solution is to replace all instances of soapclient in the NuSOAP library files (and your own code) with something else – I chose nusoapclient. If you use Notepad++, it’s as simple as opening all 13 source files and running a search/replace.