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<?php 
                 $hostname = $_SERVER['HTTP_HOST'];
                 $path = dirname($_SERVER['PHP_SELF']);

                  if (!isset($_SESSION['angemeldet']) || !$_SESSION['angemeldet'])
                 {
                      header('location:http://'.$hostname.($path == '/' ? '' : $path).'/login.php');
                      exit;
                 }
 ?>