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105 lines
4.5 KiB
Markdown
105 lines
4.5 KiB
Markdown
# Rhumsaa\Uuid for PHP
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[](https://travis-ci.org/ramsey/uuid)
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[](https://coveralls.io/r/ramsey/uuid)
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[](https://packagist.org/packages/rhumsaa/uuid)
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[](https://packagist.org/packages/rhumsaa/uuid)
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[](https://packagist.org/packages/rhumsaa/uuid)
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[](http://hhvm.h4cc.de/package/rhumsaa/uuid)
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## About
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Rhumsaa\Uuid is a PHP 5.3+ library for generating and working with
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[RFC 4122][rfc4122] version 1, 3, 4, and 5 universally unique identifiers (UUID).
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From [Wikipedia](http://en.wikipedia.org/wiki/Universally_unique_identifier):
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> The intent of UUIDs is to enable distributed systems to uniquely identify
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> information without significant central coordination. In this context the word
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> unique should be taken to mean "practically unique" rather than "guaranteed
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> unique". Since the identifiers have a finite size, it is possible for two
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> differing items to share the same identifier. The identifier size and
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> generation process need to be selected so as to make this sufficiently
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> improbable in practice. Anyone can create a UUID and use it to identify
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> something with reasonable confidence that the same identifier will never be
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> unintentionally created by anyone to identify something else. Information
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> labeled with UUIDs can therefore be later combined into a single database
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> without needing to resolve identifier (ID) conflicts.
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Much inspiration for this library came from the [Java][javauuid] and
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[Python][pyuuid] UUID libraries.
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## API Documentation
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The [latest class API documentation][apidocs] is available online. This project
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uses [ApiGen](http://apigen.org/) to generate this documentation. To
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generate the documentation on your own, run `apigen` from the root of the project.
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This will generate documentation in the `build/apidocs/` folder.
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## Requirements
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Some methods in this library have requirements due to integer size restrictions
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on 32-bit and 64-bit builds of PHP. A 64-bit build of PHP and the [Moontoast\Math][]
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library are recommended. However, this library is designed to work on 32-bit
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builds of PHP without Moontoast\Math, with some degraded functionality. Please
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check the API documentation for more information.
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If a particular requirement is not present, then a `Rhumsaa\Uuid\Exception\UnsatisfiedDependencyException`
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is thrown, allowing one to catch a bad call in an environment where the call is
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not supported and gracefully degrade.
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## Examples
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```php
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<?php
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require 'vendor/autoload.php';
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use Rhumsaa\Uuid\Uuid;
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use Rhumsaa\Uuid\Exception\UnsatisfiedDependencyException;
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try {
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// Generate a version 1 (time-based) UUID object
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$uuid1 = Uuid::uuid1();
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echo $uuid1->toString() . "\n"; // e4eaaaf2-d142-11e1-b3e4-080027620cdd
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// Generate a version 3 (name-based and hashed with MD5) UUID object
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$uuid3 = Uuid::uuid3(Uuid::NAMESPACE_DNS, 'php.net');
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echo $uuid3->toString() . "\n"; // 11a38b9a-b3da-360f-9353-a5a725514269
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// Generate a version 4 (random) UUID object
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$uuid4 = Uuid::uuid4();
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echo $uuid4->toString() . "\n"; // 25769c6c-d34d-4bfe-ba98-e0ee856f3e7a
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// Generate a version 5 (name-based and hashed with SHA1) UUID object
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$uuid5 = Uuid::uuid5(Uuid::NAMESPACE_DNS, 'php.net');
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echo $uuid5->toString() . "\n"; // c4a760a8-dbcf-5254-a0d9-6a4474bd1b62
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} catch (UnsatisfiedDependencyException $e) {
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// Some dependency was not met. Either the method cannot be called on a
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// 32-bit system, or it can, but it relies on Moontoast\Math to be present.
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echo 'Caught exception: ' . $e->getMessage() . "\n";
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}
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```
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## Installation
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The preferred method of installation is via [Packagist][] and [Composer][]. Run
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the following command to install the package and add it as a requirement to
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`composer.json`:
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```bash
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composer.phar require "rhumsaa/uuid=~2.8"
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```
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[rfc4122]: http://tools.ietf.org/html/rfc4122
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[javauuid]: http://docs.oracle.com/javase/6/docs/api/java/util/UUID.html
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[pyuuid]: http://docs.python.org/3/library/uuid.html
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[packagist]: https://packagist.org/packages/rhumsaa/uuid
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[composer]: http://getcomposer.org/
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[moontoast\math]: https://github.com/moontoast/math
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[apidocs]: http://ramsey.github.io/uuid/apidocs
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