UUID.php
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UUID.php
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	<?php
	declare(strict_types=1);

	namespace Keruald\OmniTools\Identifiers;

	class UUID {

	const UUID_REGEXP = "/^[0-9a-f]{8}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{12}$/";

	/**
	* @return string An RFC 4122 compliant v4 UUID
	*/
	public static function UUIDv4 () : string {
	// Code by Andrew Moore
	// See http://php.net/manual/en/function.uniqid.php#94959
	// https://www.ietf.org/rfc/rfc4122.txt

	return sprintf(
	'%04x%04x-%04x-%04x-%04x-%04x%04x%04x',

	// 32 bits for "time_low"
	mt_rand(0, 0xffff), mt_rand(0, 0xffff),

	// 16 bits for "time_mid"
	mt_rand(0, 0xffff),

	// 16 bits for "time_hi_and_version",
	// four most significant bits holds version number 4
	mt_rand(0, 0x0fff) \| 0x4000,

	// 16 bits, 8 bits for "clk_seq_hi_res",
	// 8 bits for "clk_seq_low",
	// two most significant bits holds zero and one for variant DCE1.1
	mt_rand(0, 0x3fff) \| 0x8000,

	// 48 bits for "node"
	mt_rand(0, 0xffff), mt_rand(0, 0xffff), mt_rand(0, 0xffff)
	);
	}

	public static function UUIDv4WithoutHyphens () : string {
	return str_replace("-", "", self::UUIDv4());
	}

	public static function isUUID ($string) : bool {
	return (bool)preg_match(self::UUID_REGEXP, $string);
	}

	}