Yandex.Metrics 1.6

/**
 * Gets counter ID for the current site from Yandex.Metrics.
 */
function yandex_metrics_get_counter_for_current_site() {

  $counter_id = variable_get('yandex_metrics_counter_id', '');
  if (!empty($counter_id)) {
    return $counter_id;
  }

  $result = yandex_metrics_retreive_data('/counters', array('field' => 'mirrors'));

  if (isset($result->error)) {
    watchdog('yandex_metrics', 'Counters request seems to be fail, due to "%error".', array('%error' => $result->code . ' ' . $result->error), WATCHDOG_WARNING);
    return;
  }

  $counters = json_decode($result->data);

  $current_host = $_SERVER['HTTP_HOST'];

  // Try to decode national domain.
  $decoded_domain = _yandex_metrics_idna_decode($current_host);

  if ($decoded_domain != FALSE && $decoded_domain != $current_host) {
      $current_host = $decoded_domain;
  }

  // list of domains, mirrors for current counter;
  $available_domains = array();
  foreach ($counters->counters as $key => $counter) {
    if ($counter->site == $current_host) {
      variable_set('yandex_metrics_counter_id', $counter->id);
      return $counter->id;
    }
    else {
      $available_domains[] = $counter->site;
    }

    // If current host is equal of any site mirror.
    if (isset($counter->mirrors)) {
      if(in_array($current_host, $counter->mirrors)) {
        variable_set('yandex_metrics_counter_id', $counter->id);
        return $counter->id;
      }
      else {
        $available_domains = array_merge($available_domains, $counter->mirrors);
      }
    }
  }

  if (!empty($available_domains)) {
    watchdog('yandex_metrics', 'No legal domains or mirrors for this host. Current host: "%host"; available domains: "%available_domains".', array('%error' => $current_host, "%available_domains" => implode(", ", $available_domains) ), WATCHDOG_WARNING);
  }
  return FALSE;
}