// Get the current URL without the query string...
echo url()->current();
// Get the current URL including the query string...
echo url()->full();
// Get the full URL for the previous request...
echo url()->previous();
use Illuminate\Support\Facades\URL;
echo URL::current();
$url = route('routeName');
//if there is a param:
$url = route('routeName', ['id' => 1]);
https://laravel.com/docs/5.1/helpers#method-route