using # in env file laravel code example

Example: laravel update env file programmatically

public static function envUpdate($key, $value)
    {
        $path = base_path('.env');

        if (file_exists($path)) {

            file_put_contents($path, str_replace(
                $key . '=' . env($key), $key . '=' . $value, file_get_contents($path)
            ));
        }
    }

And reload the page programatically again using js only once
<script>
  	window.location.reload();
</script>