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)