<?php

$hasCookie = isset($_COOKIE['TestCookie']);

echo '<pre>';

if (!$hasCookie) {
        setcookie('TestCookie', 'test', time() + 86400 * 365);
        echo "Test cookie set; <a href='?a=b'>click here to reload this page to see the result</a>.\n";
        die;
}

if ($hasCookie && isset($_REQUEST['TestCookie']))
        echo '$_REQUEST has the cookie, no bug present.';
else
        echo '$_REQUEST is missing TestCookie, there is a bug.';

echo "\n\n";

echo '$_REQUEST:';
print_r($_REQUEST);

echo "\n\n";

echo '$_COOKIE:';
print_r($_COOKIE);

echo '</pre>';