[PHP]problem z redirect Opcje

[Mgorka]

podczas logowania po przejściu całego przełącznika :

[PHP] pobierz, plaintext 
switch ($_REQUEST['action']) {
    case 'Zaloguj':
      if (isset($_POST['name'])
          and isset($_POST['passwd']))
      {
        $sql = "SELECT login, passwd, access_lvl " .
               "FROM user " .
               "WHERE login='" . $_POST['login'] . "' " .
               "AND passwd='" . $_POST['passwd'] . "'";
        $result = mysql_query($sql, $conn)
          or die('Could not look up user information; ' . 
                 mysql_error());
 
        if ($row = mysql_fetch_array($result)) {
          session_start();
          $_SESSION['passwd'] = $row['passwd'];
          $_SESSION['access_lvl'] = $row['access_lvl'];
          $_SESSION['login'] = $row['login'];
        }
      }
      redirect('index.php');
      break;
[PHP] pobierz, plaintext 

zwraca mi błąd
Fatal error: Call to undefined function redirect()