<?php
$uuid = 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)
);
$packedUuid = pack('H*', $uuid);
$unpackedUuid = unpack('H*', $packedUuid);
var_dump($unpackedUuid);
$unpackedUuid = $unpackedUuid[0];
echo $uuid . PHP_EOL;
echo strlen($uuid) . PHP_EOL;
echo $packedUuid . PHP_EOL;
echo strlen($packedUuid) . PHP_EOL;
echo $unpackedUuid . PHP_EOL;
echo strlen($unpackedUuid) . PHP_EOL;
preferences:
31.85 ms | 402 KiB | 5 Q