header("content-type:text/html;charset=utf-8");
        try {
            $client = new SoapClient("http://xxx?wsdl"
            );
//            print_r($client->__getFunctions());
//            print_r($client->__getTypes());
            $customerCode = 'wwggr';
            $sign = Md5(date
 
('Ymd',time()).$customerCode);

            $param = array(
                'factoryCode' => '1244',
                ....
                'product'=>['quantity'=>1,'sku'=>'4D5100126005'],
                ....
             );
            $param = json_encode($param,JSON_UNESCAPED_UNICODE);
            
 
print_r($param);
//            die;
//            $result = $client->__soapCall('AddOEMOrder',array("parameters"=>$param));
            $result = $client->AddOEMOrder(['model'=>$param]);
            //print_r($result);

            //將stdclass object的$result轉換為array
            $result = get_object_vars
 
($result);
            //輸出結果
            echo $result["AddOEMOrderResult"];


        } catch (SOAPFault $e) {
            print $e;
        }

伺服器無法處理請求。 ---> 值不能為 null。
引數名: value

1.傳入的引數為空

通過列印print_r($client->__getFunctions());print_r($client->__getTypes());得知呼叫AddOEMOrder 函式需要傳入string型別的model變數，如果沒有傳入model變數則會出現上述問題

Array
(
    [0] => AddOEMOrderResponse AddOEMOrder(AddOEMOrder $parameters)
    [1] => AddOEMOrderResponse AddOEMOrder(AddOEMOrder     $parameters)
)
Array
(
    [0] => struct AddOEMOrder {
        string model;
    }
    [1] => struct AddOEMOrderResponse {
        string AddOEMOrderResult;
    }
)        

例如：$result = $client->AddOEMOrder(['model'=>$param]); 是呼叫成功的，

　　而$result = $client->AddOEMOrder(['modl'=>$param]);則會出現上述問題