helper.php

<?

$cookies = array();

function getCookies() {
  global $cookies;
  $res = "";
  foreach ($cookies as $key => $cookie) {
    $res .= "$key=$cookie; ";
  }
  return $res;
}

function saveCookies($r) {
  global $cookies;
  foreach ($r as $hdr) {
    if (preg_match('/^Set-Cookie:\s*([^;]+)/', $hdr, $matches)) {
      parse_str($matches[1], $tmp);
      $cookies += $tmp;
    }
  }
}

function sendRequest($url, $data) {
  $options = array(
    'http'=>array(
      'header' => "Cookie: ".getCookies() . "\r\nContent-type: application/x-www-form-urlencoded\r\n",
      'method' => 'POST',
      'content' => http_build_query($data),
    )
  );
  $context = stream_context_create($options);
  $result = file_get_contents($url, false, $context);
  $obj = json_decode($result);
  if ($obj->status == 'error') {
    echo "There is an error: $obj->message";
    exit;
  }
  saveCookies($http_response_header);
  return $obj;
}

?>