To see the actual XML generated by the PHP SOAP Client class, you can use the __getLastRequest() method.
To call a SOAP web service on Android, you can use the HttpURLConnection class to send an HTTP request to the web service and receive the response.
SOAP (Simple Object Access Protocol) and REST (Representational State Transfer) are two different styles of web services that can be used to expose the functionality of a web-based system over the internet.
There are a few ways to convert a WSDL file to PHP code with Basic Auth.