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Example code of universetech-inc/xid-php

Informations about the package xid-php

Globally Unique ID Generator

Latest Stable Version Total Downloads Latest Unstable Version License Build Status codecov

This project is a PHP implementation of the Go Lang library found here: https://github.com/rs/xid

Package xid is a globally unique id generator library, ready to be used safely directly in your server code.

Xid is using Mongo Object ID algorithm to generate globally unique ids with a different serialization (base64) to make it shorter when transported as a string: https://docs.mongodb.org/manual/reference/object-id/

The binary representation of the id is compatible with Mongo 12 bytes Object IDs. The string representation is using base32 hex (w/o padding) for better space efficiency when stored in that form (20 bytes). The hex variant of base32 is used to retain the sortable property of the id.

Xid doesn't use base64 because case sensitivity and the 2 non alphanum chars may be an issue when transported as a string between various systems. Base36 wasn't retained either because 1/ it's not standard 2/ the resulting size is not predictable (not bit aligned) and 3/ it would not remain sortable. To validate a base32 xid, expect a 20 chars long, all lowercase sequence of a to v letters and 0 to 9 numbers ([0-9a-v]{20}).

UUIDs are 16 bytes (128 bits) and 36 chars as string representation. Twitter Snowflake ids are 8 bytes (64 bits) but require machine/data-center configuration and/or central generator servers. xid stands in between with 12 bytes (96 bits) and a more compact URL-safe string representation (20 chars). No configuration or central generator server is required so it can be used directly in server's code.

Name Binary Size String Size Features
UUID 16 bytes 36 chars configuration free, not sortable
shortuuid 16 bytes 22 chars configuration free, not sortable
Snowflake 8 bytes up to 20 chars needs machin/DC configuration, needs central server, sortable
MongoID 12 bytes 24 chars configuration free, sortable
xid 12 bytes 20 chars configuration free, sortable

Features:

Best used with xlog's RequestIDHandler.

References:

Install

Requirements:

  1. PHP >= 7.0.0
  2. POSIX enabled
  3. APCu extension (optional, to share counter across requests)

Usage

Get xid embedded info:

Decode from string:

Licenses

All source code is licensed under the MIT License.

All versions of xid-php with dependencies

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Requires php Version >=7.0.0
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