README

Luhn mod10 algorithms

Install

composer require krak/luhn

Usage

<?php

use function Krak\Luhn\luhn_validate,
    Krak\Luhn\luhn_checksum;

$ccnumber = '79927398713';

var_dump(luhn_validate($ccnumber));
// bool(true)

var_dump(luhn_checksum(substr($ccnumber, 0, -1)));
// int(67)

API

bool luhn_validate($number_string);
int luhn_checksum($number_string);

luhn_validate takes a numeric string and performs a mod10 check on it and verifies if it matches or not.

luhn_checksum takes a numeric string and returns the luhn checksum of it. This is used internally by the luhn_validate to compare a string with its last digit.

Test

You can run tests with peridot using make

make test