<?php

if(isset($_COOKIE['uID']) && isset($_COOKIE['uHASH']))

{

    $user = mysqli_fetch_assoc(mysqli_query($mysqli, "SELECT * FROM `users` WHERE `uID` = '".intval($_COOKIE['uID'])."'"));



    if(isset($user))

    {

        if(($user['uHASH'] != $_COOKIE['uHASH']))

        {

            unset($user);



            setcookie('uID', '', time() - 60*60*24*365);

            setcookie('uHASH', '', time() - 60*60*24*365);

        }

    }

}