function validURL($url) {
    $ch = curl_init();
    curl_setopt($ch, CURLOPT_URL, $url);
    curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
    curl_setopt($ch, CURLOPT_FOLLOWLOCATION, true);
    curl_setopt($ch, CURLOPT_BUFFERSIZE, 8192);
    curl_setopt($ch, CURLOPT_TIMEOUT, 5);
    curl_setopt($ch, CURLOPT_CONNECTTIMEOUT, 5);
    $output = curl_exec($ch);
    $info = curl_getinfo($ch);
    curl_close($ch);

    @$components = parse_url($url);
    
    if ( $info["http_code"] == 200 ) {
        return true;
    } else {
        if ( $components["scheme"] == "ftp" && $info["http_code"] >= 200 && $info["http_code"] < 300 ) {
            return true;
        }
        return false;
    }
}