104 lines
2.7 KiB
PHP
104 lines
2.7 KiB
PHP
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<?php
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/**
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* Zend Framework
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*
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* LICENSE
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*
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* This source file is subject to the new BSD license that is bundled
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* with this package in the file LICENSE.txt.
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* It is also available through the world-wide-web at this URL:
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* http://framework.zend.com/license/new-bsd
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* If you did not receive a copy of the license and are unable to
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* obtain it through the world-wide-web, please send an email
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* to license@zend.com so we can send you a copy immediately.
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*
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* @category Zend
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* @package Zend_Validate
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* @copyright Copyright (c) 2005-2009 Zend Technologies USA Inc. (http://www.zend.com)
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* @license http://framework.zend.com/license/new-bsd New BSD License
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* @version $Id: UpcA.php 16223 2009-06-21 20:04:53Z thomas $
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*/
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/**
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* @see Zend_Validate_Abstract
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*/
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require_once 'Zend/Validate/Abstract.php';
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/**
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* @category Zend
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* @package Zend_Validate
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* @copyright Copyright (c) 2005-2009 Zend Technologies USA Inc. (http://www.zend.com)
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* @license http://framework.zend.com/license/new-bsd New BSD License
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*/
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class Zend_Validate_Barcode_UpcA extends Zend_Validate_Abstract
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{
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/**
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* Validation failure message key for when the value is
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* an invalid barcode
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*/
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const INVALID = 'invalid';
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/**
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* Validation failure message key for when the value is
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* not 12 characters long
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*/
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const INVALID_LENGTH = 'invalidLength';
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/**
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* Validation failure message template definitions
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*
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* @var array
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*/
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protected $_messageTemplates = array(
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self::INVALID => "'%value%' is an invalid UPC-A barcode",
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self::INVALID_LENGTH => "'%value%' should be 12 characters",
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);
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/**
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* Defined by Zend_Validate_Interface
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*
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* Returns true if and only if $value contains a valid barcode
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*
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* @param string $value
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* @return boolean
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*/
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public function isValid($value)
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{
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if (!is_string($value)) {
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$this->_error(self::INVALID);
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return false;
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}
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$this->_setValue($value);
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if (strlen($value) !== 12) {
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$this->_error(self::INVALID_LENGTH);
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return false;
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}
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$barcode = substr($value, 0, -1);
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$oddSum = 0;
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$evenSum = 0;
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for ($i = 0; $i < 11; $i++) {
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if ($i % 2 === 0) {
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$oddSum += $barcode[$i] * 3;
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} elseif ($i % 2 === 1) {
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$evenSum += $barcode[$i];
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}
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}
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$calculation = ($oddSum + $evenSum) % 10;
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$checksum = ($calculation === 0) ? 0 : 10 - $calculation;
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if ($value[11] != $checksum) {
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$this->_error(self::INVALID);
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return false;
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}
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return true;
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}
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}
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