使用带有.NET的布尔返回值的PHP webservice方法

I have a PHP SOAP (NuSOAP) web service method that returns a boolean value. I've executed the method in a 3rd party test application, and it seems to return the value fine. If I look directly at the XML message that's returned, it looks fine as well - returns "true" and "false" when it's supposed to.I have a PHP SOAP (NuSOAP) web service method t