带有多个参数的SOAP XML函数调用

亲爱的Stackoverflowers，

有可能做到以下几点吗?

$client = new SoapClient("wsdldocument.wsdl");
$result = $client->myFunction( $param1, $param2, $param3 );

(如何)我可以传递多个参数到调用?

我已经尝试了以下方法，但这也不适合我:

$client = new SoapClient("wsdldocument.swdl");
$params = array( "param1" => $param1, "param2" => $param2, "param3" => $param3 );
$result = $client->__soapCall( "myFunction", $params );