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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) 2005-2008 Zend Technologies USA Inc. (http://www.zend.com)
 * @license    http://framework.zend.com/license/new-bsd     New BSD License
 * @version    $Id: Ean13.php 11791 2008-10-09 18:19:13Z andries $
 */

/**
 * @see Zend_Validate_Abstract
 */
require_once 'Zend/Validate/Abstract.php';

/**
 * @category   Zend
 * @package    Zend_Validate
 * @copyright  Copyright (c) 2005-2008 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 (false === ctype_digit($value)) {
            $this->_error(self::NOT_NUMERIC);
            return false;
        }

$valueString = (string) $value;
        $this->_setValue($valueString);

if (strlen($valueString) !== 13) {
            $this->_error(self::INVALID_LENGTH);
            return false;
        }

$barcode = strrev(substr($valueString, 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 ($valueString[12] != $checksum) {
            $this->_error(self::INVALID);
            return false;
        }

return true;
    }
}

Nama File / Folder	Size	Action
Ean13.php	3.148KB	Edit File Delete File Rename
UpcA.php	2.757KB	Edit File Delete File Rename