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<?php
/**
* Zend Framework
*
* LICENSE
*
* This source file is subject to the new BSD license that is bundled
* with this package in the file LICENSE.txt.
* It is also available through the world-wide-web at this URL:
* http://framework.zend.com/license/new-bsd
* If you did not receive a copy of the license and are unable to
* obtain it through the world-wide-web, please send an email
* to license@zend.com so we can send you a copy immediately.
*
* @category Zend
* @package Zend_Validate
* @copyright Copyright (c) 2005-2009 Zend Technologies USA Inc. (http://www.zend.com)
* @license http://framework.zend.com/license/new-bsd New BSD License
* @version $Id: Ean13.php 16223 2009-06-21 20:04:53Z thomas $
*/
/**
* @see Zend_Validate_Abstract
*/
require_once 'Zend/Validate/Abstract.php';
/**
* @category Zend
* @package Zend_Validate
* @copyright Copyright (c) 2005-2009 Zend Technologies USA Inc. (http://www.zend.com)
* @license http://framework.zend.com/license/new-bsd New BSD License
*/
class Zend_Validate_Barcode_Ean13 extends Zend_Validate_Abstract
{
/**
* Validation failure message key for when the value is
* an invalid barcode
*/
const INVALID = 'invalid';
/**
* Validation failure message key for when the value is
* not 13 characters long
*/
const INVALID_LENGTH = 'invalidLength';
/**
* Validation failure message key for when the value
* does not only contain numeric characters
*/
const NOT_NUMERIC = 'ean13NotNumeric';
/**
* Validation failure message template definitions
*
* @var array
*/
protected $_messageTemplates = array(
self::INVALID => "'%value%' is an invalid EAN-13 barcode",
self::INVALID_LENGTH => "'%value%' should be 13 characters",
self::NOT_NUMERIC => "'%value%' should contain only numeric characters",
);
/**
* Defined by Zend_Validate_Interface
*
* Returns true if and only if $value contains a valid barcode
*
* @param string $value
* @return boolean
*/
public function isValid($value)
{
if (!is_string($value) || !ctype_digit($value)) {
$this->_error(self::NOT_NUMERIC);
return false;
}
$this->_setValue($value);
if (strlen($value) !== 13) {
$this->_error(self::INVALID_LENGTH);
return false;
}
$barcode = strrev(substr($value, 0, -1));
$oddSum = 0;
$evenSum = 0;
for ($i = 0; $i < 12; $i++) {
if ($i % 2 === 0) {
$oddSum += $barcode[$i] * 3;
} elseif ($i % 2 === 1) {
$evenSum += $barcode[$i];
}
}
$calculation = ($oddSum + $evenSum) % 10;
$checksum = ($calculation === 0) ? 0 : 10 - $calculation;
if ($value[12] != $checksum) {
$this->_error(self::INVALID);
return false;
}
return true;
}
}
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