如何从复杂类型的webservices wsdl文件中获取值

Question

$wsdl_url = 'http://devapi.stellatravelgateway.stellatravelservices.co.uk/AirService.svc?wsdl';
$client = new SOAPClient($wsdl_url);

$result = $client -> Search(  array( 
                    'AirSearch' => array('MaxResultsPerAirline' => 10,  
                    'SessionID' => $token, 
                    'FareType' => 'Published', 
                    'IncludePriorDepartues' => false,
                    'ReturnIncompleteResults' => true)));