/**
 * Compute the counters.
 */
if (!($counter_since = variable_get('mycounter_since', 0))) {
  $page_hits = 1;
  $unique_visits = 1;
  $counter_since = time();
  $_SESSION['mycounter'] = TRUE;
  variable_set('mycounter_page_hits', 1);
  variable_set('mycounter_unique_visits', 1);
  variable_set('mycounter_since', $counter_since);
}
else {
  $page_hits = (int)variable_get('mycounter_page_hits', 0);
  $unique_visits = (int)variable_get('mycounter_unique_visits', 0);
  if (!isset($_SESSION['mycounter'])) {
    $_SESSION['mycounter'] = TRUE;
    $unique_visits++;
    variable_set('mycounter_unique_visits', $unique_visits);
  }
  $page_hits++;
  variable_set('mycounter_page_hits', $page_hits);
}

/**
 * Format and display the counters.
 */
print t('Total page hits: %page-hits, unique visits: %unique-visits, since %counter-since', array(
  '%page-hits' => number_format($page_hits, 0, '.', ','),
  '%unique-visits' => number_format($unique_visits, 0, '.', ','),
  //'%counter-since' => format_date($counter_since, 'custom', 'j F, Y')
  '%counter-since' => format_date(time(), 'custom', 'j F, Y')
));