php/evercookie_cache.php

<?php
/* evercookie, by samy kamkar, 09/20/2010
 *  http://samy.pl : code@samy.pl
 *
 * This is the server-side simple caching mechanism.
 *
 * -samy kamkar
 */

// we get cookie name from current file name so remember about it when rename of this file will be required 
include dirname(__FILE__) . DIRECTORY_SEPARATOR . '_cookie_name.php';
$cookie_name = evercookie_get_cookie_name(__FILE__);

// we don't have a cookie, user probably deleted it, force cache
if (empty($_COOKIE[$cookie_name])) {
    header('HTTP/1.1 304 Not Modified');
    exit;
}

header('Content-Type: text/html');
header('Last-Modified: Wed, 30 Jun 2010 21:36:48 GMT');
header('Expires: Tue, 31 Dec 2030 23:30:45 GMT');
header('Cache-Control: private, max-age=630720000');

echo $_COOKIE[$cookie_name];