PHP calls WebService of ASP.NET

There is an web method like this:

 
[WebMethod] 
public string HelloWorld() 
{ 
return "Hello World"; 
} 

ok, all set. In an php file, write as follows:
php5 itself supports SOAP calling Web Service:

 
<?php 
//get localization strings from C# webservice 
$client = new SoapClient('http://localhost/webservice1/Localization.asmx?wsdl'); 

echo "Call web service method from C# WebService:\n"; 
$result = $client->GetLocalizationResource(); 

if(!is_soap_fault($result)) 
{ 
echo "return:\n", $result->GetLocalizationResourceResult; 
} 
else 
{ 
echo "soap call fault"; 
} 
?> 

So that's OK, and we'll continue with SOAP