Php Soap请求参数作为数组

XML请求：

<ID xsi:type="xs:string">9832457</ID>    
<BookingDetails xsi:type="soapenc:Array" soapenc:arrayType="ns1:TBookingDetail[2]">

       <item xsi:type="ns1:TBookingDetail">

            <Question xsi:type="xs:string">COMMENTS</Question>

            <Answer xsi:type="xs:string">This is where the appointment notes go</Answer>

            <ErrorCode xsi:type="xs:int">0</ErrorCode>

            <ErrorDesc xsi:type="xs:string"></ErrorDesc>

            <RequestID xsi:type="xs:string"></RequestID>

        </item>

</BookingDetails>

我有一个方法要调用，soap请求中的MakeRegistration（），第二个参数是数组。上面的XML请求是我在SoapUi中的XML请求，那么我应该如何传递下面的请求

$newresult  = $client->MakeRegistration($id,$arr);

---

这是我的解决方案，对我很有用，也许对某人有帮助

   $arr = array(
                      0 => array(
                         "Question"  => "COMMENTS",
                         "Answer"    => $comment, 
                         "ErrorCode" => 0,
                         "ErrorDesc" => "",  
                         "RequestID" => ""
                   ));

    $result  = $client->MakeRegistration($id,$arr);

   $arr = array(
                      0 => array(
                         "Question"  => "COMMENTS",
                         "Answer"    => $comment, 
                         "ErrorCode" => 0,
                         "ErrorDesc" => "",  
                         "RequestID" => ""
                   ));

    $result  = $client->MakeRegistration($id,$arr);