Jak zablokovat anonymizéry? (hostname)

function check_ban() {
    if (getenv("HTTP_CLIENT_IP")) $ip = getenv("HTTP_CLIENT_IP");
    else if(getenv("HTTP_X_FORWARDED_FOR")) $ip = getenv("HTTP_X_FORWARDED_FOR");
    else if(getenv("REMOTE_ADDR")) $ip = getenv("REMOTE_ADDR");
    else $ip = "0.0.0.0";
    $host = gethostbyaddr($ip);

    $ip_ban_array = array( // banned ip address list
    '0.0.0.0'
    );

    $hostname_ban_array = array( // banned hostname list
    'mail152.anonymouse.org',
    'mail125.anonymouse.org',
    '*.anonymouse.org',
    'mail82.anonymouse.org',
    'anonymouse.org',
    '223.211.broadband3.iol.cz',
    'skylogicnet.com',
    'telsim.com.tr',
    'titannetworks.nl'
    );

    if (is_array($ip_ban_array)) {
        if (in_array($ip, $ip_ban_array)) {
            die("Vas hostname je zablokovan. Pokud si myslite, ze se jedna o chybu, nepouzivejte anonymizery.");
        }
    }

    if (is_array($hostname_ban_array)) {

        foreach ($hostname_ban_array as $ban_host) {

            if (preg_match("/".$ban_host."\b/i", $host)) {
            die("Vas hostname je zablokovan. Pokud si myslite, ze se jedna o chybu, nepouzivejte anonymizery.");
            }
        }
    }

}
check_ban();