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);

            //将stdclass object的$result转换为array
            $result = get_object_vars($result);
            //输出结果
            echo $result["AddOEMOrderResult"];


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

服务器无法处理请求。 ---> 值不能为 null。
参数名: value

1.传入的参数为空

   通过打印print_r($client->__getFunctions()); print_r($client->__getTypes());得知调用 AddOEMOrder 函数需要传入string类型的model变量，如果没有传入model变量则会出现上述问题

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]); 是调用成功的，

　　而 $result = $client->AddOEMOrder(['modl'=>$param]);则会出现上述问题