Simple UUID

Uuid.php

<?php declare(strict_types = 1);

class Uuid implements Guid
{
    private string $uuid;

    public function __construct($uuid = null)
    {
        if ($uuid !== null) {
            if (!static::isValid($uuid)) {
                throw new \InvalidArgumentException(sprintf('Invalid UUID "%s".', $uuid));
            }

            $this->uuid = $uuid;

            return;
        }

        $uuid = random_bytes(16);
        $uuid[6] = $uuid[6] & "\x0F" | "\x4F";
        $uuid[8] = $uuid[8] & "\x3F" | "\x80";
        $uuid = bin2hex($uuid);
        $this->uuid = sprintf(
            '%s-%s-%s-%s-%s',
            substr($uuid, 0, 8),
            substr($uuid, 8, 4),
            substr($uuid, 12, 4),
            substr($uuid, 16, 4),
            substr($uuid, 20, 12)
        );
    }

    public static function v4(): self
    {
        return new self();
    }

    public function equalsTo(mixed $value): bool
    {
        return $this == $value;
    }

    public function __toString(): string
    {
        return $this->uuid;
    }

    public static function isValid(string $uuid): bool
    {
        return function_exists('uuid_is_valid')
            ? uuid_is_valid($uuid)
            : (bool) preg_match('~^[0-9A-F]{8}-[0-9A-F]{4}-4[0-9A-F]{3}-[89AB][0-9A-F]{3}-[0-9A-F]{12}$~i', $uuid);
    }
}