ISO 7064

Soundways Iso7064 provides an implementation of ISO 7064:1983 Mod 37, 36, intended primarily for use in calculating the check character for GRid standard 2.1.

This requires PHP 8.0

Installation

Using Composer, require this package in the root directory of your project.

$ composer require 'soundways/iso7064'

Dependencies

ext-mbstring is required for mb_strlen. If ext-mbstring is unavailable for any reason, symfony\polyfill-mbstring is required in its place.

Iso7064 uses type hinting which requires a PHP version ^7.1

Quickstart

Calculate a check character using a GRid object:

use Soundways\Iso7064\GRid;

$grid = new GRid('A1-2425G-ABC1234002');

$grid->encode();

// returns 'A1-2425G-ABC1234002-M'
$grid->getDelimitedGRid();

Reference

The namespace contains the Mod3736 class for general-purpose encoding within the ISO standard and the GRid class which enforces GRid specific requirements and includes some helper functions.

Mod

Mod is an abstract class providing general functionality for encoding and verifying check characters using ISO 7064, regardless of modulus. Codes will be stripped of non-alphanumeric characters and stored in the object's $code attribute.

• function encode(): string
  Encode is a helper function for generating and appending a check character for the object's $code attribute. When called, the $code attribute will be updated with its check character. The result is equivalent to:

$mod = new Mod3736();
$code = 'ABCDEFG';
$code .= $mod->generateCheckChar($code);

• function generateCheckChar(?string $code): string
  Generates and returns a check character for the given code. If a code is not passed as an argument, the function will instead use the object's $code attribute.
  To create a class for a specific modulus, this function must be overridden with the algorithm for that modulus.

• function validateCheckChar(): bool
  Takes the check character from the object's $code attribute and returns whether it matches the string's calculated check character.

• function setCode(string $code): void
  Setter for the $code attribute. Strips non-alphanumeric characters automatically.

• function getCode(): string
  Getter for the $code attribute.

• function format(array $lengths, string $delimiter): string
  Returns the $code attribute delimited with sequences of the given lengths. For example, if the current code is 'ABCDEFGR' and you pass [1, 3, 3, 1] as the lengths array with '-' as the delimiter, the function will return 'A-BCD-EFG-R'.

• function getCheckChar(): string
  Helper function for returning the last character of the object's $code attribute.

Mod3736

The Mod3736 class extends Mod with functionality for Mod 37, 36.

• function generateCheckChar(?string $code): string
  Generates a check character following Mod 37, 36

GRid

The GRid class extends Mod3736 and offers largely the same functionality, but also enforces the GRid standard and includes additional helpers for formatting. If pssed a code in the constructor, the code will be checked for formatting as well as being parsed as in the Mod3736 constructor.

Functions that are directly inherited from Mod3736:

getCode()

getCheckChar()

Functions that behave like Mod3736 but enforce GRid standards:

This includes not encoding already-encoded GRids and not validating unencoded GRids.

encode()

generateCheckChar()

validateCheckChar()

setCode()

GRid function reference

• function format(): string
  Returns object's $code attribute delimited in the format XX-XXXXX-XXXXXXXXXX-X per GRid standard 2.1. Function will throw GRidException if called while the $code attribute is unencoded.
  As this function inherits from Mod3736::format(), it can be passed the $lengths and $delimiter arguments; however, these are ignored in favor of enforcing the GRid format. No arguments need to be passed to this function.

• static function checkGRid(string $code): bool
  Static helper function for quickly validating GRid codes without manually creating any instances of the GRid object, like so:

// returns true
GRid::checkGRid('A1-2425G-ABC1234002-M');

// returns false
GRid::checkGRid('A1-2425G-ABC1234002-0');

Addendum

With respect to André Catita's implementation of ISO 7064 Mod 11, 2.