Checkbox in Laravel

I need to filter a database using checkbox in Laravel 4.2 but i don't know how to verify which checkbox is checked and either how to send the information to the controller, like they do here http://ift.tt/1O6BCml. I've tried with "Input::get ('chk1') === "value"" and with "Input::has('chk1')"

Thank you ver much for you attention and your help