output.txt

[vagrant@localhost path2dx]$ php testuniqid.php
ECL00002-7f01-547c7274-5002
ECL00002-0801-547c7274-5002
ECL00002-0c65-547c7274-5002
ECL00002-f4fb-547c7274-5002
ECL00002-fafa-547c7274-5002
[vagrant@localhost path2dx]$

testuniqid.php

<?php

class SomeUniqueId {

    protected $strId = '';

    public function __construct($ip, $timestamp = null)
    {
        $ids = array(
            $this->generateLocationId(),
            $this->generateHostId($ip),
            $this->generateEpochId($timestamp),
            $this->generateHexId(),
        );
        $this->strId = implode('-', $ids);
    }

    protected function generateLocationId()
    {
        // Not sure
        return 'ECL00002';
    }

    protected function generateHostId($ip)
    {
        $ips = explode('.', $ip);
        $ips = array_map('intval', $ips);

        $x1 = sprintf('%02x', $ips[0] ^ $ips[1] ^ $ips[2]);
        $x2 = sprintf('%02x', $ips[3]);

        $ret = $x1.$x2;

        return $ret;
    }

    protected function generateEpochId($timestamp = null)
    {
        if ($timestamp === null) {
            $timestamp = time();
        }

        // Make sure they are integers
        $timestamp = (int) $timestamp;
        return dechex($timestamp);
    }

    protected function generateHexId()
    {
        // Not sure
        return '5002';
    }

    public function __toString()
    {
        return $this->strId;
    }
}

$id1 = new SomeUniqueId('127.0.0.1', time());
$id2 = new SomeUniqueId('10.0.2.1', time());
$id3 = new SomeUniqueId('192.168.100.101', time());
$id4 = new SomeUniqueId('250.220.210.251', time());
$id5 = new SomeUniqueId('251.252.253.250', time());
echo $id1."\n";
echo $id2."\n";
echo $id3."\n";
echo $id4."\n";
echo $id5."\n";