A colleague in the company is calling the webservice interface with PHP, but it keeps prompting failure, and the data cannot be exchanged. I don"t understand PHP myself. I see that he may be too busy to ask questions. Thank you all for your help.

$usertoken="****";
$url="http://********";
$arr_data=array("shopNo"=>2,"date"=>date("Y-m-d"),"data"=>array("spNum"=>"***==","isBuy"=>0,"price"=>"1.00"));
$json_data=json_encode($arr_data);
//$str_url=$url."?usertoken=".$usertoken."&data=".$json_data;
//echo $str_url;exit;
$data=array("usertoken"=>$usertoken,"data"=>"2134564");
$client = new SoapClient($url,array("track" => 1));
try {
            $response=$client->__call("HelloWorld",$data);
            print_r($response->HelloWorldResult);
        } catch (SoapFault $e) {
            print_r($e->getMessage());
        }
        exit;
        
        

this is his code. Can you see the problem when this code is posted?