PHP SOAP如何传入复杂对象

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Paymentexpress有一个SOAP服务方法Check3dsEnrollment(String username,String password, EnrolmentCheckRequest transaction).第三个参数是复杂参数，包括如下属性: acmout,cardNumber,dateExpiry,txnDescription,txnRef,currency
在php SOAP中使用数组来传入复杂参数，代码例如下：
$soapClient = new SoapClient('https://www.paymentexpress.com/WSTest/PXWS.asmx?WSDL');
$transactionDetails = array(
'acmout'=>'12.35',
'cardNumber'=>'',
'dateExpiry'=>'1010',
'txnDescription'=>'Payment Test',
'txnRef'=>'PT937459',
'currency'=>'USD',
);
$param=array(
'postUsername'       => 'My_Dev',
'postPassword'       => 'My_Password',
'transactionDetails' => $transactionDetails,
);
$ret  = $soapClient->Check3dsEnrollment($param);
print_r($ret);