// fix subdomain cookies
// based on from http://stackoverflow.com/a/9678857/1823945
// little changes by gnysek.pl
function skip_top_level_cookies()
{
    if (!empty($_SERVER['HTTP_COOKIE'])) {
        $domains_counter = array();
        foreach (explode(';', $_SERVER['HTTP_COOKIE']) as $cookie_variable_string) {
            $key_value = explode('=', $cookie_variable_string);
            $cookie_var_name = trim($key_value[0]);
            if (!array_key_exists($cookie_var_name, $domains_counter)) {
                $domains_counter[$cookie_var_name] = 1;
            }
            $http_cookie_variables[$cookie_var_name][$domains_counter[$cookie_var_name]] = (!empty($key_value[1])) ? urldecode(trim($key_value[1])) : '';
            $domains_counter[$cookie_var_name]++;
        }

        $levelDomain = substr_count($_SERVER['HTTP_HOST'], '.');

        $newCookies = array();
        foreach ($http_cookie_variables as $cookieName => $cookie) {
            if (array_key_exists($levelDomain, $cookie)) {
                $newCookies[$cookieName] = $cookie[$levelDomain];
            } else {
                $newCookies[$cookieName] = $cookie[1];
            }
        }
        $_COOKIE = $newCookies;
    }
    return true;
}

if (substr_count($_SERVER['HTTP_HOST'], '.') > 1) {
    skip_top_level_cookies();
}