What does the error that the SOAP client displays mean?

Question

PHP

Hello.

Unable to get data from SOAP server.

Throws an error:
Fatal error: Uncaught SoapFault exception: [Client] SOAP-ERROR: Encoding: object has no 'Type' property


Client code:

<?php
$client = new SoapClient(
      'http://89.208.141.8/CargoMSK/ws/Cargo3WS.1cws?wsdl',
            array(
                'login' => "web",         // логин
                'password' => "web",  // пароль
            )
        );

$a = array(
  'login' => 'login',
  'password' => 'password',
  'documents' => array(
    'Key' => 'Documents',
    'Properties' => array(
      'Key' => 'DocumentType',
      'Value ' => 'Order',
      'ValueType' => 'string',
    ),
    'List' => array(
      array('Key' => '00-00000497004')
    )
  ),
  'parameters' => array(
    'Key' => 'Parameters',
  )
);

$d = $client->Tracking($a);

print_r($d);
?>

Perhaps someone can tell me what I'm doing wrong.

Answer 1

Read wsdl. We find the required request.

operation tracking

<operation name="Tracking">
  <input message="tns:TrackingRequestMessage"/>
  <output message="tns:TrackingResponseMessage"/>
</operation>

This means that the Tracking request takes TrackingRequestMessage as input. Looking further

messageTrackingRequestMessage

<message name="TrackingRequestMessage">
  <part name="parameters" element="tns:Tracking"/>
</message>

The only parameters field with Tracking type. We are looking for this type.

element Tracking

<xs:element name="Tracking">
  <xs:complexType>
    <xs:sequence>
      <xs:element name="Language" type="xs:string" nillable="true"/>
      <xs:element name="Login" type="xs:string" nillable="true"/>
      <xs:element name="Password" type="xs:string" nillable="true"/>
      <xs:element name="Type" type="xs:string"/>
      <xs:element name="Documents" type="xs:string" nillable="true"/>
    </xs:sequence>
  </xs:complexType>
</xs:element>

We get an object or an associative array with text fields Language, Login, Password, Type and Documents, and all fields except Type can be null.
So the request should look like

$result = $client->Tracking([
    'Language' => ?string,
    'Login' => ?string,
    'Password' => ?string,
    'Type' => string,
    'Documents' => ?string
]);

The same can be obtained using PHP. After connecting to the client, we get a list of methods.

var_dump($client->__getFunctions());
/* ...
[92] => string(47) "TrackingResponse Tracking(Tracking $parameters)"
... */

This means that the Tracking method takes one parameter with the Tracking type and returns a TrackingResponse type response.
Let's ask for types.
var_dump($client->__getTypes());

Request result

/* ...
[120] => string(103) "struct Tracking {
 string Language;
 string Login;
 string Password;
 string Type;
 string Documents;
}"
[121] => string(51) "struct TrackingResponse {
 ResultTracking return;
}"
[24] => string(81) "struct ResultTracking {
 TrackingInfo Items;
 boolean Error;
 string ErrorInfo;
}"
[28] => string(227) "struct TrackingInfo {
 boolean Error;
 string Type;
 string Number;
 string Info;
 string AgentURL;
 dateTime CreateDate;
 string State;
 dateTime DeliveryDate;
 string DeliveryInfo;
 TrackingEvent History;
 Waybill Waybills;
}"
[27] => string(83) "struct TrackingEvent {
 dateTime EventDate;
 string EventName;
 string EventInfo;
}"
[31] => string(546) "struct Waybill {
 string Type;
 string Number;
 dateTime CreateDate;
 string State;
 dateTime DeliveryDate;
 string Sender;
 string SenderGeography;
 string Recipient;
 string RecipientGeography;
 string RecipientAddress;
 dateTime SendDate;
 string Payer;
 int CargoQty;
 float NetWeight;
 float GrossWeight;
 string ConsolidationNumber;
 string InventoryWaybillNumber;
 string DeliveryMethod;
 float Volume;
 boolean RequirePaymentInCash;
 float PaymentInCash;
 string PaymentInCashCurrency;
 string RecipientOfficial;
 TrackingEvent History;
}"
... */

The only difference from wsdl's self-parsing is that it doesn't specify which fields are optional, which fields can be filled with null, and whether some fields are arrays.