* * This library is free software; you can redistribute it and/or * modify it under the terms of the GNU Lesser General Public * License as published by the Free Software Foundation; either * version 2.1 of the License, or (at your option) any later version. * * This library 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 * Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public * License along with this library; if not, write to the Free Software * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA * * @link http://www.phpinsider.com/php/code/SmartyValidate/ * @copyright 2001-2005 New Digital Group, Inc. * @author Monte Ohrt * @package SmartyValidate */ /** * test if a value is a valid credit card checksum * * @param string $value the value being tested * @param boolean $empty if field can be empty * @param array params validate parameter values * @param array formvars form var values */ function smarty_validate_criteria_isCCNum($value, $empty, &$params, &$formvars) { if(strlen($value) == 0) return $empty; // strip everything but digits $value = preg_replace('!\D+!', '', $value); if (empty($value)) return false; $_c_digits = preg_split('//', $value, -1, PREG_SPLIT_NO_EMPTY); $_max_digit = count($_c_digits)-1; $_even_odd = $_max_digit % 2; $_sum = 0; for ($_count=0; $_count <= $_max_digit; $_count++) { $_digit = $_c_digits[$_count]; if ($_even_odd) { $_digit = $_digit * 2; if ($_digit > 9) { $_digit = substr($_digit, 1, 1) + 1; } } $_even_odd = 1 - $_even_odd; $_sum += $_digit; } $_sum = $_sum % 10; if($_sum) return false; return true; } ?>