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<?php
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/**
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* Project: SmartyValidate: Form Validator for the Smarty Template Engine
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* File: validate_criteria.isCCNum.php
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* Author: Monte Ohrt <monte at newdigitalgroup dot com>
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*
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* @link http://www.phpinsider.com/php/code/SmartyValidate/
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* @copyright 2001-2005 New Digital Group, Inc.
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* @author Monte Ohrt <monte at newdigitalgroup dot com>
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* @package SmartyValidate
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*/
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/**
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* test if a value is a valid credit card checksum
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*
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* @param string $value the value being tested
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* @param boolean $empty if field can be empty
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* @param array params validate parameter values
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* @param array formvars form var values
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*/
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function smarty_validate_criteria_isCCNum($value, $empty, &$params, &$formvars) {
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if(strlen($value) == 0)
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return $empty;
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// strip everything but digits
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$value = preg_replace('!\D+!', '', $value);
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if (empty($value))
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return false;
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$_c_digits = preg_split('//', $value, -1, PREG_SPLIT_NO_EMPTY);
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$_max_digit = count($_c_digits)-1;
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$_even_odd = $_max_digit % 2;
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$_sum = 0;
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for ($_count=0; $_count <= $_max_digit; $_count++) {
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$_digit = $_c_digits[$_count];
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if ($_even_odd) {
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$_digit = $_digit * 2;
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if ($_digit > 9) {
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$_digit = substr($_digit, 1, 1) + 1;
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}
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}
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$_even_odd = 1 - $_even_odd;
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$_sum += $_digit;
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}
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$_sum = $_sum % 10;
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if($_sum)
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return false;
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return true;
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}
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?>
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