I am quite new to Nginx, and it seems all so confusing. I have my server setup perfectly, but the problem is, since my server is protected using a HTTP proxy; instead of logging the real users IP's, it's logging the proxy server IP.

What I tried doing was setting `$_SERVER['REMOTE_ADDR'];` to `$_SERVER['X-Forwarded-For'];` but I'm getting a undefined index error, so I'm guessing I have to define `X-Forwarded-For` in Nginx? But I am not aware how to do so, I have a simple setup, it's just Nginx with PHP. Nothing more, nothing less.

I've searched all over the web, but can't actually find some information that is friendly to understand. 

I have access to the source code, if that somewhat helps. I've tried many solutions, but to no avail.