if (isset($_POST['multidelete'])) {
    foreach ((array) $delete_lh as $lh) {
        delete_lh($lh);
    }
    cm_redirect(admin_url("lecture-edit.php"));
}
switch ($action) {
    case 'delete':
        delete_lh($lh);
        cm_redirect(admin_url("lecture-edit.php"));
        break;
    case 'edit':
        $editing = true;
        $lh = get_lh_to_edit($lh);
        setup_lhdata($lh);
        $title = __("Chỉnh sửa giảng đường - ") . get_lh_name();
        require_once 'template-loader.php';
        break;
    case 'update':
        $new_lh_data['name'] = strip_all_tags($_POST['lh_name']);
        $new_lh_data['address'] = strip_all_tags($_POST['lh_address']);
        $redirect = admin_url("lecture-hall.php?action=edit&lh={$lh}");
        $cmdb->update($cmdb->lecture_hall, $new_lh_data, array("lh_id" => $lh));
        cm_redirect($redirect);
        break;
    case 'new':
        //$lh=0;
        $new_lh_data['name'] = strip_all_tags($_POST['lh_name']);
        $new_lh_data['address'] = strip_all_tags($_POST['lh_address']);
        $cmdb->insert($cmdb->lecture_hall, $new_lh_data);
        if ($redirect_to) {
function lh_name()
{
    echo get_lh_name();
}