// 削除実行
    // SQLインジェクション対策のためintvalでフィルタリング
    $delete_ids = array_map('intval', array_keys($delete)) or print_error('err_shared_id', 'block_sharing_cart', $return_to);
    $items = $DB->get_records_select('sharing_cart', 'user = '******' AND ' . 'id IN (' . implode(',', $delete_ids) . ')') or print_error('err_shared_id', 'block_sharing_cart', $return_to);
    $user_dir = make_user_directory($USER->id, true);
    // ファイル削除に成功したIDのみをDB削除に渡す
    $delete_ids = array();
    foreach ($items as $id => $item) {
        if (@unlink($user_dir . '/' . $item->file)) {
            $delete_ids[] = $id;
        } else {
            $notifications[] = get_string('err_delete', 'block_sharing_cart');
        }
    }
    delete_records_select('sharing_cart', 'id IN (' . implode(',', $delete_ids) . ')');
    sharing_cart_table::renumber($USER->id);
    if (count($notifications)) {
        notice(implode('<br />', $notifications), $return_to);
    } else {
        redirect($return_to);
    }
    exit;
}
$title = get_string('bulkdelete', 'block_sharing_cart');
$navlinks = array();
if ($course_id != SITEID) {
    $navlinks[] = array('name' => get_field('course', 'shortname', 'id', $course_id), 'link' => $CFG->wwwroot . '/course/view.php?id=' . $course_id, 'type' => 'title');
}
$navlinks[] = array('name' => $title, 'link' => '', 'type' => 'title');
print_header_simple($title, '', build_navigation($navlinks));
print_heading($title);