SWDB/application/helper/NET_Helper.php

<?php
    /**
     * Netowrk helper file.
     *
     * Provides a helper to perform network operations.
     *
     * @category Helper.
     */

    /**
     * Require dependent files if not present.
     */
    require_once(PATH::HELPER . "Helper.php");

    /**
     * Netowrk helper.
     *
     * Contains netowrk related utilities.
     *
     * @category Helper.
     */
    final class NET extends Helper{

        /**
         * Finds out the protocol the user is connecting to the site with.
         *
         * @return string "http://" or "https://".
         */
        public static function get_protocol(){
            if (isset($_SERVER["HTTPS"]) && ($_SERVER["HTTPS"] == "on" || $_SERVER["HTTPS"] == 1) || isset($_SERVER["HTTP_X_FORWARDED_PROTO"]) && $_SERVER["HTTP_X_FORWARDED_PROTO"] == "https") {
                $protocol = "https://";
            }
            else {
                $protocol = "http://";
            }
            return $protocol;
        }

        /**
         * Finds out the IP address of the client.
         * 
         * @return string Client IP address.
         */
        public static function get_ip(){
            $client  = @$_SERVER["HTTP_CLIENT_IP"];
            $forward = @$_SERVER["HTTP_X_FORWARDED_FOR"];
            $remote  = $_SERVER["REMOTE_ADDR"];
            if(filter_var($client, FILTER_VALIDATE_IP)){
                $ip = $client;
            }
            elseif(filter_var($forward, FILTER_VALIDATE_IP)){
                $ip = $forward;
            }
            else{
                $ip = $remote;
            }
            return $ip;
        }

    }
?>