private function add_comment()
 {
     if (isset($_POST['comment'])) {
         $adv_id = isset($_POST['adventure2comment']) ? $_POST['adventure2comment'] : '';
         $content = isset($_POST['content']) ? $_POST['content'] : '';
         Model_adventure::add_comment($adv_id, $_SESSION["id"], $content);
         $this->display_adventure($adv_id);
     }
 }
 private function remove_adventure()
 {
     $adv_id = isset($_POST['adventure2remove']) ? $_POST['adventure2remove'] : '';
     Model_adventure::remove_adventure($adv_id);
     new Controller_visitor('home');
 }
 private function display_profile()
 {
     global $rep, $views;
     $user_id = isset($_GET['id_user']) ? $_GET['id_user'] : '';
     $user = Model_user::getUserById($user_id);
     $adventures = Model_adventure::getUserAdventures($user_id);
     require $rep . $views["profile"];
 }