issues with $_SERVER['REMOTE_ADDR'];

Question

currently I am trying to store my clients IP address on view, this proving to be more complicated then expected.

Here is the code I am currently using.

<?php
    $ip = $_SERVER['REMOTE_ADDR'];
    print $_SERVER['REMOTE_ADDR'];
    $details = json_decode(file_get_contents("http://ipinfo.io/{$ip}/json"));
    $location = $details->country;
    print '<br>';
    print $details->country;
    print '<br>';
    print $details->city;
?>

which returns something that looks like this.

173.245.56.104
US
San Francisco

This IP and this location links back to a cloudflare server and not my actual IP address.

You can see that information here cf-173-245-56-104.cloudflare.com.

How ever when my buddies visit the same url which contains the document that is suppose to be giving the IP it gives them a different IP also connected to CloudFlare.

Example 1 being the following.

199.27.128.244
SG
Singapore

Which links to this cloudflare hostname cf-199-27-128-244.cloudflare.com.

And with a simple lookup you can see that it does not even provided the right GEO so for the reason I am looking to use this code, it would not even be viable if it's saying US based users are from Singapore or other countries.

So the question is, HOW can I get the REAL client IP address on visit?