This package provides few functions that calculate EAN13 digits and checksum digit. It does not generate barcode images (and it will stay that way). You can use this package to generate barcode image using calculated value.
It uses https://github.com/ronanguilloux/IsoCodes to validate generated codes.
checkdigit
function was taken from here: https://edmondscommerce.github.io/php/barcode/ean13-barcode-check-digit-with-php.html
I hope this package helps you.
use function Newride\EAN13\create;
create('123'); // 0000000001236
use function Newride\EAN13\checkdigit;
checkdigit('123'); // 6