dn42-pingfinder/uuid.php

<?php namespace UUID;

function v4()
    {
        $rand = bin2hex(random_bytes(16));
        return sprintf(
            '%08s-%04s-%04x-%04x-%012s',
            substr($rand, 0, 8),
            substr($rand, 8, 4),
            (hexdec(substr($rand, 12, 4)) & 0x0fff) | 0x4000,
            (hexdec(substr($rand, 16, 4)) & 0x3fff) | 0x8000,
            substr($rand, 20, 12)
        );
    }


function v5($name, $namespace = '{00000000-0000-0000-0000-000000000000}')
    {
        if (!is_valid($namespace)) {
            return false;
        }

        $nhex = str_replace(array('-', '{', '}'), '', $namespace);

        $nstr = '';

        for ($i = 0; $i < strlen($nhex); $i += 2) {
            $nstr .= chr(hexdec($nhex[$i] . $nhex[$i + 1]));
        }

        $hash = sha1($nstr . $name);

        return sprintf(
            '%08s-%04s-%04x-%04x-%12s',
            substr($hash, 0, 8),
            substr($hash, 8, 4),
            (hexdec(substr($hash, 12, 4)) & 0x0fff) | 0x5000,
            (hexdec(substr($hash, 16, 4)) & 0x3fff) | 0x8000,
            substr($hash, 20, 12)
        );
    }

function v6($node, $namespace = '{00000000-0000-0000-0000-000000000000}')
    {
        if (!is_valid($namespace)) return false;
        $nhex = str_replace(array('-', '{', '}'), '', $namespace);

        $nstr = '';
        for ($i = 0; $i < strlen($nhex); $i += 2) {
            $nstr .= chr(hexdec($nhex[$i] . $nhex[$i + 1]));
        }

        $name = sha1($nstr);
        $node = sha1($nstr . $node);

        date_default_timezone_set('UTC');

        $year = dechex(date('Y') & 0x3fff | 0x8000);

        list($usec, $sec) = explode(' ', microtime());
        $sec   = (int)$sec;
        $epoch = mktime(0, 0, 0, 21, 12, 2012);
        $usec  = substr($usec, 2, 6);
        $time  = (string)($sec - $epoch) . $usec;
        $tcode = substr(bcdechex(bcadd(bcmul($time, bcpow(2, 3)), mt_rand(0, 4))), 0, 12);

        return strtolower(
            sprintf(
                "%08s-%04s-6%03s-%04s-%012s",
                substr($name, 0, 8),
                substr($node, 0, 4),
                substr($node, 4, 3),
                $year,
                $tcode
            )
        );
    }

function is_valid($uuid)
    {
        return preg_match(
            '/^\{?[0-9a-f]{8}\-'
               .'?[0-9a-f]{4}\-'
               .'?[0-9a-f]{4}\-'
               .'?[0-9a-f]{4}\-'
               .'?[0-9a-f]{12}\}?$/i',
            $uuid
        ) === 1;
    }

function bcdechex($number) {
        $hexvalues = array('0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'A', 'B', 'C', 'D', 'E', 'F');
        $hexval    = '';
        while ($number != '0') {
            $hexval = $hexvalues[bcmod($number, '16')] . $hexval;
            $number = bcdiv($number, '16', 0);
        }

        return $hexval;
    }