PHP Laravel 取得客戶端IP

PHP Laravel 取得客戶端IP的方式：

Laravel:

public function index(Request $request) {
  $request->ip();
}

PHP:

if (isset($_SERVER['HTTP_CLIENT_IP'])) {

   $result = $_SERVER['HTTP_CLIENT_IP'];

} elseif (isset($_SERVER['HTTP_X_FORWARDED_FOR'])) {

   $result = $_SERVER['HTTP_X_FORWARDED_FOR'];

} elseif (isset($_SERVER['HTTP_X_FORWARDED'])) {

   $result = $_SERVER['HTTP_X_FORWARDED'];

} elseif (isset($_SERVER['HTTP_FORWARDED_FOR'])) {

   $result = $_SERVER['HTTP_FORWARDED_FOR'];

} elseif (isset($_SERVER['HTTP_FORWARDED'])) {

   $result = $_SERVER['HTTP_FORWARDED'];

} elseif (isset($_SERVER['REMOTE_ADDR'])) {

   $result = $_SERVER['REMOTE_ADDR'];

} else {

    $result = '';
}