append to url in Laravel

I'm trying to implement a displayPerPage (10, 25, 50, etc.) when displaying a list of results on an index page. However i'm having a hard time how to just append that to the url without replacing the other query strings.

Example:

I have a paginator to switch pages however, if i'm on page 5 for example and select display per page 10 results on my select dropdown, it will load the results but erase the page=5 from the url. How to I just append displayPerPage without erasing where I currently am on the paginator.

Thanks for any help.

I know its possible to do it without creating a custom paginator since I have done it on another project with laravel 4, but that was a while back and I can't seem to figure out how to do it again.

via Chebli Mohamed