$params->SecurityToken = new SoapVar($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 all depends on if you REALLY need to use SoapVars.
Without SoapVars it is very simple:
$params->CarrierCodeFilterList = new StdClass();
$params->CarrierCodeFilterList->CarrierCode = array("string1", "string2");
If you have to use SoapVars (which is not always - in fact I found using SoapVars necessary only where ComplexType with extensions were used in WSDL - rare thing):
$carrierCode1 = new SoapVar("string1", XSD_STRING, "string", "
http://www.w3.org/2001/XMLSchema");
$carrierCode2 = new SoapVar("string1", XSD_STRING, "string", "
http://www.w3.org/2001/XMLSchema");
$carrierCodeFilterList = new StdClass();
$carrierCodeFilterList->CarrierCode = array($carrierCode1, $carrierCode2);
$params->CarrierCodeFilterList = new SoapVar($carrierCodeFilterList, SOAP_ENC_OBJECT, "CarrierCodeFilterList", "
http://ws.oag.com");
The main trick is to use arrays where some element is defined with maxOccurs > 1 in WSDL.
(I guessed type name of CarrierCodeFilterList - it should be easily found in WSDL. I'm not sure what should be there if it is an anonymous type)
Hope it helps (I didn't test the code above).