How do you obtain the user's ip address for the google reCAPTCHA request? PHP Laravel 5

I have implemented the Google ReCaptcha where it verifies just the g-captcha-response from the $_POST and my secret. However, I don't know how to obtain or send the remote ip. I'm using Laravel 5 and I'm new to php in general. Any help would be much appreciated :)

via Chebli Mohamed