<?php

if(isset($_GET['remove'])) {
    setcookie($_GET['remove'], "", time()-3600, $_GET['path']);
    echo "Removed cookie: {$_GET['remove']}. <a href=?>Continue</a>";
    exit;
}

echo '<ul>';
foreach($_COOKIE as $key => $val) {
    echo "<li>$key <a href=?remove=". urlencode($key) . "&path=/>remove</a>";
}
echo "</ul>";
?>
<a href=source.php?file=clean_cookie.php>source.php</a>