sunaoka/damm

A PHP library that calculates and verifies the check digit using the Damm algorithm.

v1.2.0 2025-09-25 02:06 UTC

Requires

• php: ^7.2 || ^8.0

Requires (Dev)

• phpstan/phpstan: ^1.12
• phpunit/phpunit: ^8.5 || ^9.6 || ^10.5 || ^11.5 || ^12.3

MIT

• sunaoka

• Check digit
• damm

README

A PHP library that calculates and verifies the check digit using the Damm algorithm.

Quasigroups are supported from order 3 to order 64 as well as order 10.

Installation

composer require sunaoka/damm

Usage

Quasigroup of order 10 (default)

<?php

use Sunaoka\Damm\Damm;

$damm = new Damm('0123456789');

echo $damm->calculate('572');
// => 4

var_dump($damm->validate('5724'));
// => bool(true)

Quasigroup of order 62

<?php

use Sunaoka\Damm\Damm;
use Sunaoka\Damm\Order\Order62;

$damm = new Damm('0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ', new Order62());

echo $damm->calculate('4MTYDKH0S0E');
// => D

var_dump($damm->validate('4MTYDKH0S0ED'));
// => bool(true)