get tdl with domain

function get_tld($url) {
    $tld = '';
    $parsed_url = parse_url($url);
    $host = isset($parsed_url['host']) ? $parsed_url['host'] : '';
    if ($host == '') {
        return $tld;
    }
    $host_components = explode('.', $host);
    $tld_components = array_slice($host_components, -2);
    $tld = implode('.', $tld_components);
    return $tld;
}