Call to a member function call() on a non-object question

[holepro]

I can call the following function successfully as a single php program

 

  // Acknowledge and clear the orders

  function ack($client, $merchant, $id) {

        $docs = array('string' => $id);

        $params = array('merchant' => $merchant, 'documentIdentifierArray' => $docs);

        $result = $client->call('postDocumentDownloadAck', $params);

        return $result;

        }

with

 

$result = ack($t, $merchant,'2779540483');

 

successful output

 

    [documentDownloadAckProcessingStatus] => _SUCCESSFUL_

    [documentID] => 2779540483

 

I'm trying to figure out how to call this function as an object from another program.

 

Trying the following gives error  ***Call to a member function call() on a non-object***

 

  function postDocumentDownloadAck($t, $merchant, $id) {

    $this->error = null;

    $docs = array('string' => $this->id);

    $params = array('merchant' => $this->merchant, 'documentIdentifierArray' => $docs);

 

**  I've tried the following which does nothing

    $result = $this->soap->call('postDocumentDownloadAck', $params);

 

** I've tried the following  -  which gives error "Call to a member function call() on a non-object"

    $result = $this->t->soap->call('postDocumentDownloadAck', $params);

 

    if($this->soap->fault) {

        $this->error = $result;

        return false;

    }

 

    return $result;

  }

 

 

***

 

calling program snippet for above function

$merchant= array( "merchant"=> $merchantid, "merchantName" => $merchantname, "email"=> $login, "password"=> $password);

$t = new AmazonMerchantAPI($merchantid, $merchantname, $login, $password);

$documentlist= $t->GetAllPendingDocumentInfo('_GET_ORDERS_DATA_');

$docid = $documentlist['MerchantDocumentInfo'][$i]['documentID'];

$docs = array('string' => $docid);

$ackorders = $t->postDocumentDownloadAck($t, $merchant,$docs);

 

Any ideas of what I'm doing wrong are greatly appreciated.