PHP SoapClient calls .NET web service

1. Link to the WSDL output of the .NET web service as below
$client = new SoapClient("http://yourhost/your_web_service.asmx?wsdl");

2. Declare params
$params = array();
$params['param1'] = $value1; //param1 = first variable name in  YourWebMethod  of .Net web service
$params['param2'] = $value2; //param2 = second variable name in  YourWebMethod  of .Net web service
...

3. Call web method / function
$result = $client->YourWebMethod($params)->YourWebMethodResult;

4. Process $result