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| <?php | |
| /** | |
| * EAN validation and checksumming functionality | |
| * | |
| * PHP version 7 | |
| * | |
| * Copyright (c) Demian Katz 2019. | |
| * | |
| * This program is free software; you can redistribute it and/or modify | |
| * it under the terms of the GNU General Public License version 2, | |
| * as published by the Free Software Foundation. | |
| * | |
| * This program 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 General Public License for more details. | |
| * | |
| * You should have received a copy of the GNU General Public License | |
| * along with this program; if not, write to the Free Software | |
| * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA | |
| * | |
| * @category VuFind | |
| * @package Code | |
| * @author Demian Katz <demian.katz@villanova.edu> | |
| * @license http://opensource.org/licenses/gpl-2.0.php GNU General Public License | |
| * @link https://vufind.org Main Page | |
| */ | |
| namespace VuFindCode; | |
| /** | |
| * EAN Class | |
| * | |
| * This class provides EAN validation and checksumming functionality. | |
| * | |
| * @category VuFind | |
| * @package Code | |
| * @author Demian Katz <demian.katz@villanova.edu> | |
| * @license http://opensource.org/licenses/gpl-2.0.php GNU General Public License | |
| * @link https://vufind.org Main Page | |
| */ | |
| class EAN | |
| { | |
| /** | |
| * Return the first sequence of at least 12 digits followed by an optional X. | |
| * These characters may be separated by any number of '.', '-', '_' and | |
| * whitespace characters; the separation characters are removed. | |
| * A lower x is converted to an upper X. | |
| * | |
| * @param string $raw EAN to clean up. | |
| * | |
| * @return string Normalized EAN. | |
| */ | |
| public static function normalizeEAN($raw) | |
| { | |
| if (!preg_match('/(?:\d(?:[\s_.-])*){12,}[xX]?/', $raw, $match)) { | |
| return ''; | |
| } | |
| return preg_replace('/[^0-9X]/', '', strtoupper($match[0])); | |
| } | |
| /** | |
| * Given the first 12 digits of an EAN, generate the check digit. | |
| * | |
| * @param string $ean The first 12 digits of an EAN. | |
| * | |
| * @return string The check digit. | |
| */ | |
| public static function getEAN13CheckDigit($ean) | |
| { | |
| $sum = 0; | |
| $weight = 1; | |
| for ($x = 0; $x < strlen($ean); $x++) { | |
| $sum += intval(substr($ean, $x, 1)) * $weight; | |
| $weight = $weight == 1 ? 3 : 1; | |
| } | |
| $retval = 10 - ($sum % 10); | |
| return $retval == 10 ? 0 : $retval; | |
| } | |
| /** | |
| * Is the provided EAN valid? | |
| * | |
| * @param string $ean The EAN to test. | |
| * | |
| * @return bool | |
| */ | |
| public static function isValidEAN13($ean) | |
| { | |
| $ean = static::normalizeEAN($ean); | |
| if (strlen($ean) != 13) { | |
| return false; | |
| } | |
| return | |
| substr($ean, 12) == self::getEAN13CheckDigit(substr($ean, 0, 12)); | |
| } | |
| } |