1. Go to this page and download the library: Download substacks/gs1_128 library. Choose the download type require.
2. Extract the ZIP file and open the index.php.
3. Add this code to the index.php.
<?php
require_once('vendor/autoload.php');
/* Start to develop here. Best regards https://php-download.com/ */
substacks / gs1_128 example snippets
$builder = new Barcode\Builder();
$builder->output('(10)123456(400)11');