Gazelle/sections/bookmarks/mass_edit.php

<?php
#declare(strict_types=1);

authorize();
if ($UserID !== $LoggedUser['ID']
 || !Bookmarks::can_bookmark('torrent')) {
    error(403);
}

if ($_POST['type'] === 'torrents') {
    // require_once SERVER_ROOT.'/classes/mass_user_bookmarks_editor.class.php'; // Bookmark Updater Class
    $BU = new MASS_USER_BOOKMARKS_EDITOR;
  
    if ($_POST['delete']) {
        $BU->mass_remove();
    } elseif ($_POST['update']) {
        $BU->mass_update();
    }
}

header('Location: bookmarks.php?type=torrents');