function redirect_ssl()
{
    $isSecure = false;
    if (isset($_SERVER['HTTPS']) && $_SERVER['HTTPS'] == 'on') {
        $isSecure = true;
    } elseif (!empty($_SERVER['HTTP_X_FORWARDED_PROTO']) && $_SERVER['HTTP_X_FORWARDED_PROTO'] == 'https' || !empty($_SERVER['HTTP_X_FORWARDED_SSL']) && $_SERVER['HTTP_X_FORWARDED_SSL'] == 'on') {
        $isSecure = true;
    }
    $REQUEST_PROTOCOL = $isSecure ? 'https' : 'http';

    if ($REQUEST_PROTOCOL == "http") {
        $redirect = 'https://' . $_SERVER['HTTP_HOST'] . $_SERVER['REQUEST_URI'];
        header('HTTP/1.1 301 Moved Permanently');
        header('Location: ' . $redirect);
        exit();
    }
}