调试php的soapCient

try {
            import('@.Ext.xml');
            header("Content-Type:text/html; charset=utf-8");
            $soap = new SoapClient('http://localhost/index.php/Api/index?wsdl');
            $usr = $_POST['usr'];
            $psw = $_POST['psw'];
            $ret = $soap->userLogin($usr, $psw);
            dump(xml_unserialize($ret));
        } catch (SoapFault $e) {
            echo '__getLastRequest<br/>';
            echo $soap->__getLastRequest();
            echo '__getLastResponse<br/>';
            echo $soap->__getLastResponse();
            echo 'getMessage<br/>';
            echo $e->getMessage();
        }