<?php
//by mssmaks
function uuidFromString($string) {
    $val = md5($string, true);
    $byte = array_values(unpack('C16', $val));

    $tLo = ($byte[0] << 24) | ($byte[1] << 16) | ($byte[2] << 8) | $byte[3];
    $tMi = ($byte[4] << 8) | $byte[5];
    $tHi = ($byte[6] << 8) | $byte[7];
    $csLo = $byte[9];
    $csHi = $byte[8] & 0x3f | (1 << 7);

    if (pack('L', 0x6162797A) == pack('N', 0x6162797A)) {
        $tLo = (($tLo & 0x000000ff) << 24) | (($tLo & 0x0000ff00) << 8) | (($tLo & 0x00ff0000) >> 8) | (($tLo & 0xff000000) >> 24);
        $tMi = (($tMi & 0x00ff) << 8) | (($tMi & 0xff00) >> 8);
        $tHi = (($tHi & 0x00ff) << 8) | (($tHi & 0xff00) >> 8);
    }

    $tHi &= 0x0fff;
    $tHi |= (3 << 12);

    $uuid = sprintf(
        '%08x%04x%04x%02x%02x%02x%02x%02x%02x%02x%02x',
        $tLo, $tMi, $tHi, $csHi, $csLo,
        $byte[10], $byte[11], $byte[12], $byte[13], $byte[14], $byte[15]
    );
    $uuid = hex2bin($uuid);
    return $uuid;
}

function uuidConvert($string)
{
    $string = uuidFromString("OfflinePlayer:".$string);
    return $string;
}

//uuidConvert($_GET['nick']);