Mine

if (isset($_POST['nimi']) && $_POST['nimi'] != "") {
  $dbh->query("INSERT INTO $taulu (ilmo, nimi) VALUES('$tapahtuma', '" . $dbh->escape($_POST['nimi']) . "')");
  $_SESSION['status'] = "OK";

  $server = "";
  if (isset($_SERVER['SCRIPT_URI'])) {
    $server = $_SERVER['SCRIPT_URI'];
  } else {
    $server = 'http://' . $_SERVER['SERVER_NAME'] . $_SERVER['SCRIPT_NAME'];
  }
  header("Location: " . $server);
  die();
}