";
$topic = filter_input(INPUT_GET, 'topic', FILTER_SANITIZE_STRING, FILTER_NULL_ON_FAILURE);
$section = filter_input(INPUT_GET, 'section', FILTER_SANITIZE_STRING, FILTER_NULL_ON_FAILURE);
if ($topic) {
  $helps = $db->get_Help($topic);
  if (is_array($helps) && count($helps) && isset($helps['section'])) {
    $helps = [0 => $helps];
  }
  foreach ($helps as $key => $help) {
    print "";
    if (preg_match('/^[A-D]$/', $help['section'])) {
      print "Appendix ";
    }
    print "{$help['section']} - {$help['title']}
";
    print "