$ch = curl_init();

curl_setopt($ch, CURLOPT_URL,$url);
curl_setopt($ch, CURLOPT_POST, 1);

$postfields = array();
$postfields['CostCode'] = '999999801';

curl_setopt($ch, CURLOPT_POSTFIELDS,
          $postfields);

curl_setopt($ch, CURLOPT_HTTPHEADER, array(
                                        'Content-Type: multipart/form-data;
charset=UTF-8',
                                        'Connection: Keep-Alive'
                                        ));

// receive server response ...
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);

$server_output = curl_exec ($ch);

curl_close ($ch);

$postfields = array();
    $postfields['CostCode'] = '999999801';

    $client = new ZendHttpClient();

    $client->setAdapter(new ZendHttpClientAdapterCurl());

    $request = new ZendHttpRequest();

    $request->setUri($url);
    $request->setMethod(ZendHttpRequest::METHOD_POST);
    $request->getHeaders()->addHeaders([
        'Content-Type' => 'multipart/form-data; charset=UTF-8'
    ]);

    $request->setContent($postfields);

    $response = $client->dispatch($request);