NukeViet\Http\Http::get_Env PHP Method

    private function get_Env($key)
    {
        if (!is_array($key)) {
            $key = array($key);
        }
        foreach ($key as $k) {
            if (isset($_SERVER[$k])) {
                return $_SERVER[$k];
            } elseif (isset($_ENV[$k])) {
                return $_ENV[$k];
            } elseif (@getenv($k)) {
                return @getenv($k);
            } elseif (function_exists('apache_getenv') and apache_getenv($k, true)) {
                return apache_getenv($k, true);
            }
        }
        return '';
    }