README

ABANDONED! This package is discontinued and will not be updated.

Checkdigit

Helper classes to calculate and validate ckecksums.

Installation

composer require byrokrat/checkdigit

Checkdigit requires the bcmath php extension.

API

The Calculator interface defines two methods:

• isValid(string $number): bool checks if number contains a valid check digit.
• calculateCheckDigit(string $number): string calculates the check digit for number.

Implementations include:

• Modulo10 and Luhn for modulo 10 check digits (Luhn is simply a shorthand for Modulo10).
• Modulo10Gtin for modulo 10 check digits variant used in GTIN barcodes.
• Modulo11 for modulo 11 check digits.
• Modulo97 for modulo 97 check digits.

Usage

$luhn = new byrokrat\checkdigit\Luhn;

// outputs '1' (true)
echo $luhn->isValid('55555551');

// outputs '' (false)
echo $luhn->isValid('55555550');

// outputs '1'
echo $luhn->calculateCheckDigit('5555555');