Consuming (.NET) Web services using PHP and NuSoap

In my scenario a .NET Web service offers particular encrypting capabilities.
I need to consume this Web service sending my clear string, I aspect to receive an encrypted string.
The Web service is obviously working properly.

I found this interesting library, so I adopted it:

require_once('lib/nusoap.php');

Here is the code:

// requires web service's specifications aka wsdl
// $parameters:    
// requires following the array 'notation'
// array('parameters' => (array('text' => 'Hello World!!!')));
// that equals to Hello World!!!
// $proxy (->host, ->port, ->username, -> password)
// optional, uses a proxy server

function consume_webservice($wsdl, $method, $parameters, $debug = false, $proxy = null)
{
	if ($proxy != null)
		$proxy->host = $proxy->port = $proxy->username = $proxy->password = false;

	$client = new soapclient($wsdl, true, $proxy->host, $proxy->port, $proxy->username, $proxy->password);
	$err = $client->getError();

	if ($err)
		echo '
Constructor error
' . $err . '
';

	$result = $client->call($method, $parameters);

	// check for a fault
	if ($client->fault)
	{
		echo '
Fault
';
		print_r($result);
		echo '
';
	}
	else
	{
		// check for errors
		$err = $client->getError();

		if ($err)
			echo '
Error
' . $err . '
';
	}

	if ($debug)
	{
		echo '
Request
' . htmlspecialchars($client->request, ENT_QUOTES) . '
';
		echo '
Response
' . htmlspecialchars($client->response, ENT_QUOTES) . '
';
		echo '
Debug
' . htmlspecialchars($client->debug_str, ENT_QUOTES) . '
';
	}

	return $result;
}

This may work (only) with all soap Web services.
Please note that .NET Web services includes all response content into a "parameters" section.