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Please upgrade to the 4.x series.* *NOTICE: Formerly known as `rhumsaa/uuid`, The package and namespace names have changed to `ramsey/uuid` and `Ramsey\Uuid`, respectively.* [![Source Code][badge-source]][source] [![Series][badge-series]][series] [![Upgrade][badge-upgrade]][upgrade] [![PHP Version][badge-php]][php] [![Software License][badge-license]][license] [![Build Status][badge-build]][build] [![Coverage Status][badge-coverage]][coverage] ramsey/uuid is a PHP 5.4+ library for generating and working with [RFC 4122][rfc4122] version 1, 3, 4, and 5 universally unique identifiers (UUID). This project adheres to a [Contributor Code of Conduct][conduct]. By participating in this project and its community, you are expected to uphold this code. From [Wikipedia](http://en.wikipedia.org/wiki/Universally_unique_identifier): > The intent of UUIDs is to enable distributed systems to uniquely identify > information without significant central coordination. In this context the word > unique should be taken to mean "practically unique" rather than "guaranteed > unique". Since the identifiers have a finite size, it is possible for two > differing items to share the same identifier. The identifier size and > generation process need to be selected so as to make this sufficiently > improbable in practice. Anyone can create a UUID and use it to identify > something with reasonable confidence that the same identifier will never be > unintentionally created by anyone to identify something else. Information > labeled with UUIDs can therefore be later combined into a single database > without needing to resolve identifier (ID) conflicts. Much inspiration for this library came from the [Java][javauuid] and [Python][pyuuid] UUID libraries. ## Installation The preferred method of installation is via [Composer][]. Run the following command to install the package and add it as a requirement to your project's `composer.json`: ```bash composer require ramsey/uuid ``` ## Upgrading from 2.x to 3.x While we have made significant internal changes to the library, we have made every effort to ensure a seamless upgrade path from the 2.x series of this library to 3.x. One major breaking change is the transition from the `Rhumsaa` root namespace to `Ramsey`. In most cases, all you will need is to change the namespace to `Ramsey` in your code, and everything will "just work." Here are full details on the breaking changes to the public API of this library: 1. All namespace references of `Rhumsaa` have changed to `Ramsey`. Simply change the namespace to `Ramsey` in your code and everything should work. 2. The console application has moved to [ramsey/uuid-console](https://packagist.org/packages/ramsey/uuid-console). If using the console functionality, use Composer to require `ramsey/uuid-console`. 3. The Doctrine field type mapping has moved to [ramsey/uuid-doctrine](https://packagist.org/packages/ramsey/uuid-doctrine). If using the Doctrine functionality, use Composer to require `ramsey/uuid-doctrine`. ## What to do if you see a "rhumsaa/uuid is abandoned" message When installing your project's dependencies using Composer, you might see the following message: ``` Package rhumsaa/uuid is abandoned, you should avoid using it. Use ramsey/uuid instead. ``` Don't panic. Simply execute the following commands with Composer: ``` bash composer remove rhumsaa/uuid composer require ramsey/uuid=^2.9 ``` After doing so, you will have the latest ramsey/uuid package in the 2.x series, and there will be no need to modify any code; the namespace in the 2.x series is still `Rhumsaa`. ## Requirements Some methods in this library have requirements due to integer size restrictions on 32-bit and 64-bit builds of PHP. A 64-bit build of PHP and the [Moontoast\Math][] library are recommended. However, this library is designed to work on 32-bit builds of PHP without Moontoast\Math, with some degraded functionality. Please check the API documentation for more information. If a particular requirement is not present, then an `UnsatisfiedDependencyException` is thrown, allowing one to catch a bad call in an environment where the call is not supported and gracefully degrade. ## Examples See the [cookbook on the wiki][wiki-cookbook] for more examples and approaches to specific use-cases. ```php toString() . "\n"; // i.e. e4eaaaf2-d142-11e1-b3e4-080027620cdd // Generate a version 3 (name-based and hashed with MD5) UUID object $uuid3 = Uuid::uuid3(Uuid::NAMESPACE_DNS, 'php.net'); echo $uuid3->toString() . "\n"; // i.e. 11a38b9a-b3da-360f-9353-a5a725514269 // Generate a version 4 (random) UUID object $uuid4 = Uuid::uuid4(); echo $uuid4->toString() . "\n"; // i.e. 25769c6c-d34d-4bfe-ba98-e0ee856f3e7a // Generate a version 5 (name-based and hashed with SHA1) UUID object $uuid5 = Uuid::uuid5(Uuid::NAMESPACE_DNS, 'php.net'); echo $uuid5->toString() . "\n"; // i.e. c4a760a8-dbcf-5254-a0d9-6a4474bd1b62 } catch (UnsatisfiedDependencyException $e) { // Some dependency was not met. Either the method cannot be called on a // 32-bit system, or it can, but it relies on Moontoast\Math to be present. echo 'Caught exception: ' . $e->getMessage() . "\n"; } ``` ## Contributing Contributions are welcome! Please read [CONTRIBUTING.md][] for details. ## Copyright and License The ramsey/uuid library is copyright © [Ben Ramsey](https://benramsey.com/) and licensed for use under the MIT License (MIT). Please see [LICENSE][] for more information. [rfc4122]: http://tools.ietf.org/html/rfc4122 [conduct]: https://github.com/ramsey/uuid/blob/master/.github/CODE_OF_CONDUCT.md [javauuid]: http://docs.oracle.com/javase/6/docs/api/java/util/UUID.html [pyuuid]: http://docs.python.org/3/library/uuid.html [composer]: http://getcomposer.org/ [moontoast\math]: https://packagist.org/packages/moontoast/math [wiki-cookbook]: https://github.com/ramsey/uuid/wiki/Ramsey%5CUuid-Cookbook [contributing.md]: https://github.com/ramsey/uuid/blob/master/.github/CONTRIBUTING.md [badge-source]: https://img.shields.io/badge/source-ramsey/uuid-blue.svg?style=flat-square [badge-series]: https://img.shields.io/badge/series-3.x-darkcyan.svg?style=flat-square [badge-upgrade]: https://img.shields.io/packagist/v/ramsey/uuid.svg?style=flat-square&label=upgrade&colorB=darkred [badge-license]: https://img.shields.io/packagist/l/ramsey/uuid.svg?style=flat-square&colorB=darkcyan [badge-php]: https://img.shields.io/packagist/php-v/ramsey/uuid/3.x-dev.svg?style=flat-square&colorB=%238892BF [badge-build]: https://img.shields.io/github/workflow/status/ramsey/uuid/build/3.x.svg?logo=github&style=flat-square [badge-coverage]: https://img.shields.io/codecov/c/gh/ramsey/uuid/3.x.svg?style=flat-square&logo=codecov [source]: https://github.com/ramsey/uuid/tree/3.x [series]: https://packagist.org/packages/ramsey/uuid [upgrade]: https://packagist.org/packages/ramsey/uuid [license]: https://github.com/ramsey/uuid/blob/master/LICENSE [php]: https://php.net [build]: https://github.com/ramsey/uuid/actions/workflows/continuous-integration.yml?query=branch%3A3.x [coverage]: https://app.codecov.io/gh/ramsey/uuid/branch/3.x