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Example code of pwm/uuid-v4

Informations about the package uuid-v4

UUID version 4

Build Status codecov Maintainability Test Coverage License: MIT

Implementation of the RFC 4122 UUID version 4 (variant 1) data type. UUID stands for Universally Unique Identifier.

Table of Contents

Why

We already have comprehensive UUID libraries in PHP, eg. ramsey/uuid.

My goal was to create a minimalistic implementation of the version 4 UUID spec. UUIDv4-s are randomly generated which makes implementation trivial as it requires nothing other than a random external seed value.

The decision to only implement version 4 resulted in a tiny functional library capturing the UUIDv4 data type that can be understood in minutes. Creation happens using a pure function that takes the random seed and is trivially testable.

Requirements

PHP 7.1+

Installation

$ composer require pwm/uuid-v4

Usage

Creating a UUIDv4 data type from a valid string:

Creating a random UUIDv4 from a 16 byte random seed:

Creating from the same seed produces the same UUIDv4:

How it works

UUID version 4 is defined in RFC 4122 as a sequence of 128 bits, where 6 bits are fixed (4 for the version, 2 for the variant) leaving 122 randomly generated bits for entropy.

UuidV4 is a simple data type that can only be created from valid UUIDv4 strings. It comes with a createFrom() function that facilitates the creation of random UUIDv4-s from 16 byte random seeds. It is to be used with PHP's random_bytes() function.

Tests

$ vendor/bin/phpunit
$ composer phpcs
$ composer phpstan
$ composer infection

Changelog

Click here

Licence

MIT

All versions of uuid-v4 with dependencies

PHP Build Version
Package Version
Requires php Version >=7.1.0
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