help with soapvar and xml list

I'm trying to create a request with a list. Here is what the request should be: <?xml version="1.0" encoding="utf-8"?> <soap:Envelope xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:soap="http://schemas.xmlsoap.org/soap/envelope/"> <soap:Body> <OFSFAAByAirportPairPerHour xmlns="http://ws.oag.com">

     <SecurityToken>string</SecurityToken>
     <DepartureDateTime>string</DepartureDateTime>
     <DepAirportCode>string</DepAirportCode>
     <ArrAirportCode>string</ArrAirportCode>
    * <CarrierCodeFilterList>
       <CarrierCode>string</CarrierCode>
       <CarrierCode>string</CarrierCode>
     </CarrierCodeFilterList>*
     <ServiceTypeIndicator>short</ServiceTypeIndicator>
     <GMTLocalTimeIndicator>short</GMTLocalTimeIndicator>
     <IncludeCodeShareDisclosure>boolean</IncludeCodeShareDisclosure>
     <SchedStatusIndicator>short</SchedStatusIndicator>
     <DataSource>short</DataSource>
     <ResultXML>string</ResultXML>

</OFSFAAByAirportPairPerHour> </soap:Body> </soap:Envelope> So I can get everything except the CarrierCodeFilterList right. How would I use SoapVar or something else to create that? Here is an excerpt of what I'm using for the rest: $params->SecurityToken = new SoapVar($sectoken, XSD_STRING, 'string', "http://www.w3.org/2001/XMLSchema"); $params->DepartureDateTime = new SoapVar('2007-06-06', XSD_STRING, 'string', "http://www.w3.org/2001/XMLSchema"); $params->DepAirportCode = new SoapVar('BOI', XSD_STRING, 'string', "http://www.w3.org/2001/XMLSchema"); $client = new SoapClient('file.wsdl'); $airresult = $client->OFSByAirportPairPerHour($air); $airport = $airresult->OFSByAirportPairPerHourResult; It gives me an error about the specified type was not recognized for the CarrierCodeFilterList so I can't even use __getLastRequest. Thanks!