shows you how to extend smarty with custom plugins (blocks, functions and modifierts) and keep the functions inside the module folder
put the vt-devutils folder into the modules directory in your shop. You will find the code snippet in the module description in OXID backend
Copyright (C) 2013 Marat Bedoev
This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 3 of the License, or (at your option) any later version.
This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.
You should have received a copy of the GNU General Public License along with this program; if not, see http://www.gnu.org/licenses/