Sometimes we want to get the user ip address right away for verification purposes. This is the most efficient version that I found online.

//Ref: http://stackoverflow.com/questions/3003145/how-to-get-the-client-ip-address-in-php

if (!empty($_SERVER['HTTP_CLIENT_IP'])) {
    $ip = $_SERVER['HTTP_CLIENT_IP'];
} elseif (!empty($_SERVER['HTTP_X_FORWARDED_FOR'])) {
    $ip = $_SERVER['HTTP_X_FORWARDED_FOR'];
} else {
    $ip = $_SERVER['REMOTE_ADDR'];
}