Create a random UUID in PHP based on the UUID V1 format

create_uuid1.php

<?php
/*

Create a random UUID in PHP based on the UUID V1 format

Output example: e22e1622-5c14-11ea-b2f3-0242ac130003


The MIT License (MIT)
Copyright (c) 2024 Stephen Monro
Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

*/

function generateUuidV1() {
    // Get the current timestamp
    $time = microtime(true) * 10000000 + 122192928000000000;

    // Convert timestamp to 64-bit binary
    $timeBin = pack('J', (int)floor($time));

    // Get the clock sequence (14 bits)
    $clockSeq = random_int(0, 0x3fff);
    $clockSeqHex = str_pad(dechex($clockSeq), 4, '0', STR_PAD_LEFT);
    $clockSeqBin = hex2bin($clockSeqHex);

    // Get the node (48 bits)
    //$node = hex2bin('0242ac130003'); // Replace this with your desired node value

    // Generate a random node (48 bits)
    $node = random_bytes(6);

    // Set the multicast bit and the least significant bit
    $node[0] = chr(ord($node[0]) | 0x01);

    // Format the UUID
    $uuidBin = sprintf(
        '%08s%04s1%03s%04s%012s',
        bin2hex(substr($timeBin, 4)), // Time_low
        bin2hex(substr($timeBin, 2, 2)), // Time_mid
        bin2hex(substr($timeBin, 0, 2)), // Time_hi_and_version
        $clockSeqHex, // Clock_seq_hi_and_reserved
        bin2hex($node) // Node
    );

    // Convert binary UUID to string
    $uuid = vsprintf('%s%s-%s-%s-%s-%s%s%s', str_split($uuidBin, 4));

    return $uuid;
}

 

// Example use case

$generatedUuid = generateUuidV1();
echo $generatedUuid . "\n";