Clear cache and cookies if they are from an older version

clearOlderCookies.php

<?php
define('APP_VERSION', '1.2.14');
if ($_COOKIE['APP_VERSION'] !== APP_VERSION) {
    // Delete all cookies and invalidate cache if it is from an older version
    if (isset($_SERVER['HTTP_COOKIE'])) {
        // Unset cookies - http://stackoverflow.com/a/2310591/937891
        $cookies = explode(';', $_SERVER['HTTP_COOKIE']);
        foreach ($cookies as $cookie) {
            $parts = explode('=', $cookie);
            $name = trim($parts[0]);
            setcookie($name, '', time() - 1000);
            setcookie($name, '', time() - 1000, '/');
        }
    }
    // Uncache current page - http://stackoverflow.com/a/11057772/937891
    header("Expires: Tue, 01 Jan 2000 00:00:00 GMT");
    header("Last-Modified: " . gmdate("D, d M Y H:i:s") . " GMT");
    header("Cache-Control: no-store, no-cache, must-revalidate, max-age=0");
    header("Cache-Control: post-check=0, pre-check=0", false);
    header("Pragma: no-cache");
}
$_COOKIE['APP_VERSION'] = APP_VERSION;