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 documention for more information.

If a particular requirement is not present, then a [\Rhumsaa\Uuid\Exception\UnsatisfiedDependencyException][] is thrown, allowing one to catch a bad call in an environment where the call is not supported and gracefully degrade.

Examples

<?php
use Rhumsaa\Uuid\Uuid;

// Generate a version 1 (time-based) UUID
$uuid1 = Uuid::uuid1();
echo $uuid1 . "\n"; // e4eaaaf2-d142-11e1-b3e4-080027620cdd

// Generate a version 3 (name-based and hashed with MD5) UUID
$uuid3 = Uuid::uuid3(Uuid::NAMESPACE_DNS, 'php.net');
echo $uuid3 . "\n"; // 11a38b9a-b3da-360f-9353-a5a725514269

// Generate a version 4 (random) UUID
$uuid4 = Uuid::uuid4();
echo $uuid4 . "\n"; // 25769c6c-d34d-4bfe-ba98-e0ee856f3e7a

// Generate a version 5 (name-based and hashed with SHA1) UUID
$uuid5 = Uuid::uuid5(Uuid::NAMESPACE_DNS, 'php.net');
echo $uuid5 . "\n"; // c4a760a8-dbcf-5254-a0d9-6a4474bd1b62

Installation

The preferred method of installation is via Packagist, as this provides the PSR-0 autoloader functionality. The following composer.json will download and install the latest version of the Uuid library into your project:

{
    "require": {
        "rhumsaa/uuid": "2.0.*"
    }
}