PHPでUUIDv4を作成するサンプルコード

<?php

function generateUUIDv4() {
    $data = random_bytes(16);

    // バージョンを設定 (4はUUIDv4を表す)
    $data[6] = chr(ord($data[6]) & 0x0f | 0x40);

    // RFC 4122 バリアントを設定
    $data[8] = chr(ord($data[8]) & 0x3f | 0x80);

    return vsprintf('%s%s-%s-%s-%s-%s%s%s', str_split(bin2hex($data), 4));
}

var_dump(generateUUIDv4()); // string(36) "2fe46dc9-cdce-4c94-a2c8-2096bd317b51"
var_dump(generateUUIDv4()); // string(36) "e99e26d4-ef7b-4fe7-93a4-b463e5ad6dff"
var_dump(generateUUIDv4()); // string(36) "1fa22622-5270-4adf-ad57-7faf4ef607ff"

 $ php sample.php
string(36) "2fe46dc9-cdce-4c94-a2c8-2096bd317b51"
string(36) "e99e26d4-ef7b-4fe7-93a4-b463e5ad6dff"
string(36) "1fa22622-5270-4adf-ad57-7faf4ef607ff"
 $ php sample.php
string(36) "0a47e8d0-fe99-4e24-ac74-02d9f4aaa396"
string(36) "7f9df017-182f-4412-9d29-e833936ed553"
string(36) "d1ba8635-2fc5-4a9a-a99d-6cf301baa486"
 $ php sample.php
string(36) "a1c50510-e9f9-40c4-b117-f9819d79b72e"
string(36) "547e3e45-a86c-4ee9-b972-61d0d6eb9861"
string(36) "dd5448d5-9521-40e5-afbc-6dab8d595c02"
 $ php sample.php
string(36) "5aeb1850-cd6d-47be-a641-92d224d160a6"
string(36) "5e6cb333-6b01-4406-8690-c4f77bd17bca"
string(36) "361495f5-557e-4809-8ae2-d26b4b4be00d"
 $ php sample.php
string(36) "e44ac1f5-7d70-4720-b5cc-b9a81868609b"
string(36) "8ae16f4a-e3ea-4aee-9d7c-4ea7afb704f9"
string(36) "f5e36476-a66d-45a6-9e3a-edb2e109f22c"
 $ php sample.php
string(36) "4f3ad84b-3a33-457a-bd13-08f4358a1934"
string(36) "c68d8326-4f60-438d-a92b-e40549e2c88b"
string(36) "029ead16-10e6-4a43-8879-c9b5ce859169"

    /**
     * Generate a UUID (version 4).
     *
     * @return \Ramsey\Uuid\UuidInterface
     */
    public static function uuid()
    {
        return static::$uuidFactory
                    ? call_user_func(static::$uuidFactory)
                    : Uuid::uuid4();
    }

    /**
     * Version 4 (random) UUID
     *
     * @link https://tools.ietf.org/html/rfc4122#section-4.1.3 RFC 4122, § 4.1.3: Version
     */
    public const UUID_TYPE_RANDOM = 4;


    /**
     * Returns a version 4 (random) UUID
     *
     * @return UuidInterface A UuidInterface instance that represents a
     *     version 4 UUID
     */
    public static function uuid4(): UuidInterface
    {
        return self::getFactory()->uuid4();
    }

    public function uuid4(): UuidInterface
    {
        $bytes = $this->randomGenerator->generate(16);

        return $this->uuidFromBytesAndVersion($bytes, Uuid::UUID_TYPE_RANDOM);
    }

    /**
     * Returns an RFC 4122 variant Uuid, created from the provided bytes and version
     *
     * @param string $bytes The byte string to convert to a UUID
     * @param int $version The RFC 4122 version to apply to the UUID
     *
     * @return UuidInterface An instance of UuidInterface, created from the
     *     byte string and version
     *
     * @psalm-pure
     */
    private function uuidFromBytesAndVersion(string $bytes, int $version): UuidInterface
    {
        /** @var array $unpackedTime */
        $unpackedTime = unpack('n*', substr($bytes, 6, 2));
        $timeHi = (int) $unpackedTime[1];
        $timeHiAndVersion = pack('n*', BinaryUtils::applyVersion($timeHi, $version));

        /** @var array $unpackedClockSeq */
        $unpackedClockSeq = unpack('n*', substr($bytes, 8, 2));
        $clockSeqHi = (int) $unpackedClockSeq[1];
        $clockSeqHiAndReserved = pack('n*', BinaryUtils::applyVariant($clockSeqHi));

        $bytes = substr_replace($bytes, $timeHiAndVersion, 6, 2);
        $bytes = substr_replace($bytes, $clockSeqHiAndReserved, 8, 2);

        if ($this->isDefaultFeatureSet) {
            return LazyUuidFromString::fromBytes($bytes);
        }

        /** @psalm-suppress ImpureVariable */
        return $this->uuid($bytes);
    }

        $bytes = substr_replace($bytes, $timeHiAndVersion, 6, 2);
        $bytes = substr_replace($bytes, $clockSeqHiAndReserved, 8, 2);

 $ php artisan --version
Laravel Framework 10.20.0
 $ php artisan tinker
Psy Shell v0.11.20 (PHP 8.1.12 — cli) by Justin Hileman
> Str::uuid();
= Ramsey\Uuid\Lazy\LazyUuidFromString {#8082
    uuid: "43e2cec4-cc87-4bc2-8b4a-20efa64514e9",
  }

> Str::uuid();
= Ramsey\Uuid\Lazy\LazyUuidFromString {#8105
    uuid: "2f5686c6-cf9b-495c-931a-e5eaa2c1cc6c",
  }

>