PHP SoapClient WSDL DeserializationFailed无效的枚举值

Question

我试图在PHP中使用SoapClient从WSDL中检索数据。如果我使用硬编码值，那么它可以使用零错误：

$client = new SoapClient(someWSDLUrl);
$params2 = array();
$params2['AuthenticationKey'] = $obj->{'LoginResult'}; 
$params2['VehicleClass'] = 'UsedCar';
$params2['ApplicationCategory'] = 'Consumer';
$params2['VersionDate'] = '2016';
$result2 = $client->GetMakes($params2);

当我使用变量或动态内容时，我收到以下错误：

Fatal error: Uncaught SoapFault exception: [a:DeserializationFailed
] The formatter threw an exception while trying to deserialize the message: There was an error while trying to deserialize parameter 
http://someURL/VehicleInformationService:VehicleClass
. The InnerException message was 'Invalid enum value 'UsedCars'

我试过了

$client = new SoapClient(someWSDLUrl);
$params2 = array();
$params2['AuthenticationKey'] = $obj->{'LoginResult'}; 
$params2['VehicleClass'] = $VehicleClass;
$params2['ApplicationCategory'] = $ApplicationCategory;
$params2['VersionDate'] = $VersionDate;
$result2 = $client->GetMakes($params2);

我也试过

$client = new SoapClient(someWSDLUrl);
$params2 = array();
$params2['AuthenticationKey'] = (string) $obj->{'LoginResult'}; 
$params2['VehicleClass'] = (string) $VehicleClass;
$params2['ApplicationCategory'] = (string) $ApplicationCategory;
$params2['VersionDate'] = (string) $VersionDate;
$result2 = $client->GetMakes($params2);

我也尝试过：

$SubmitData = new stdClass();
$SubmitData->AuthenticationKey = new SoapVar($obj->{'LoginResult'}, XSD_STRING);
$SubmitData->VehicleClass = new SoapVar($VehicleClass, XSD_STRING);
$SubmitData->ApplicationCategory = new SoapVar($ApplicationCategory, XSD_STRING);
$SubmitData->VersionDate = new SoapVar($VersionDate, XSD_STRING);

$result2 = $client->GetMakes($SubmitData);

每次都有相同的错误。我不知道如何解决“无效的枚举值”错误

提前致谢