PHP: Get user's real IP address

gistfile1.php

function get_ip() {
    if( isset($_SERVER['HTTP_CLIENT_IP']) ) { 
        $ip = $_SERVER['HTTP_CLIENT_IP'];
    } elseif( isset($_SERVER['HTTP_X_FORWARDED_FOR']) ) {
        $ip = $_SERVER['HTTP_X_FORWARDED_FOR'];
    } else {
        $ip = @$_SERVER['REMOTE_ADDR'];	
    }
    return $ip;	
}