ACC SHELL

                                                                                                           
Session_Start();                                                                                           
                                                                                                           
// pokud je autor prihlasen, vlozime do prislusnych promennych informace ze session                        
if (isset($_SESSION['auth'])) {                                                                            
  $user_id = $_SESSION['auth']['id'];                                                                      
  $name = $_SESSION['auth']['name'];                                                                       
  $time = $_SESSION['auth']['time'];                                                                       
                                                                                                           
  // pokud je autor vice nez 30 min neaktivni, musi se prihlasit znovu; jinak se aktualizuje cas v session 
  if ($time < time()) {                                                                                    
    session_destroy();                                                                                     
    header('Location: http://'. $_SERVER['HTTP_HOST'] . '/mff/orders/login.php');                          
    exit;                                                                                                  
  } else {                                                                                                 
    $_SESSION['auth']['time'] = time() + 1800;                                                             
  }                                                                                                        
} else {                                                                                                   
  // autor neni prihlasen                                                                                  
  header('Location: http://'. $_SERVER['HTTP_HOST'] . '/mff/orders/login.php');                            
  exit;                                                                                                    
}