A PHP library to convert and validate ISBNs

3.0.0 2022-11-26 00:00 UTC


tests Latest Stable Version Total Downloads License Gitpod ready-to-code

biblys/isbn can be used to:

  • validate a string against the ISBN-10, ISBN-13 and EAN-13 formats
  • convert an ISBN to ISBN-10, ISBN-13, EAN-13, GTIN-14 and ISBN-A/DOI formats
  • parse an ISBN to extract registration agency, publisher code, publication code, checksum, etc.



  • Requirements: PHP 7.2 or above

Install with composer:

composer require biblys/isbn:~3.0



Use case: converting an EAN (9782843449499) to an ISBN-13 (978-2-84344-949-9).


use Biblys\Isbn\Isbn;

try {
    $input = "9782843449499";
    $isbn13 = Isbn::convertToIsbn13($input);
    echo "ISBN-13: $isbn13"; // Prints ISBN-13: 978-2-84344-949-9
} catch(Exception $e) {
    echo "An error occurred while attempting to format ISBN $input: ".$e->getMessage();

All formatting methods:

  • Isbn::convertToIsbn10
  • Isbn::convertToIsbn13
  • Isbn::convertToEan13
  • Isbn::convertToGtin14
  • Isbn::convertToIsbnA


Use case: validating an incorrectly formed ISBN-13 (978-2-843-44949-9, should be 978-2-84344-949-9).


use Biblys\Isbn\Isbn;

try {
    $input = "978-2-843-44949-9";
    echo "ISBN $input is valid!";
} catch(Exception $e) { // Will throw because third hyphen is misplaced
    echo "ISBN $input is invalid: ".$e->getMessage();

All validating methods:

  • Isbn::validateAsIsbn10
  • Isbn::validateAsIsbn13
  • Isbn::validateAsEan13
  • Isbn::isParsable

Learn more about validating ISBNs


Use case: extracting the publisher code from an ISBN.

use Biblys\Isbn\Isbn;

$input = "9782956420132";
$isbn = Isbn::parse($input);
echo $isbn->getRegistrantElement(); // Prints "9564201"

Isbn::parse returns a ParsedIsbn object implementing the following methods:

  • ParsedIsbn->getGs1Element:: EAN product code
  • ParsedIsbn->getRegistrationGroupElement: Country, geographical region or language aera code
  • ParsedIsbn->getRegistrantElement: Publisher (or imprint within a group) code
  • ParsedIsbn->getPublicationElement: Publication code
  • ParsedIsbn->getCheckDigit: Checksum used for validation


Using Gitpod

You can start a dev environment by clicking Gitpod ready-to-code and start hacking in your browser right away!


If you'd rather set up a local dev environment, you'll need:

  • PHP 7.x
  • Composer
  • (Optional) Docker to run tests and debug against different version of PHP

Clone this repository and run composer install to get started!


Run tests with PHPUnit:

composer install
composer test

Run tests in a docker container:

composer docker:test

Run tests in a docker container using a specific PHP version:

PHP_VERSION=7.1 composer docker:test

ISBN ranges update

New ISBN ranges may be added from time to time by the International ISBN Agency. Whenever it happens, this library must be updated. If a range update is necessary, please open an issue on GitHub. You can also open a pull request after updating the ranges your self with the following commands:

composer install
composer run update-ranges

Or using a docker container:

composer docker:update-ranges


See GitHub releases