[PHP] WHMCS Attacker Logger

<?php
    /*
     * (C) Mark Hughes, 2011
     * www.markeh.me
     */

    // You only need to change this value
    $your_email = "mark@nivsu.com";

    // ------//
    $email = "The attacker supplied us with the following infomration:\r\n";

    if(isset($_SERVER["REMOTE_ADDR"])) {
        $email .="_SERVER[REMOTE_ADDR] = {$_SERVER["REMOTE_ADDR"]} - Host: " . gethostbyaddr($_SERVER["REMOTE_ADDR"]) . "\r\n";
    }

    if(isset($_SERVER["HTTP_CLIENT_IP"])) {
        $email .="_SERVER[HTTP_CLIENT_IP] = {$_SERVER["HTTP_CLIENT_IP"]} - Host: " . gethostbyaddr($_SERVER["HTTP_CLIENT_IP"]) . "\r\n";
    }

    if(isset($_SERVER["HTTP_X_FORWARDED_FOR"])) {
        $email .="_SERVER[HTTP_X_FORWARDED_FOR] = {$_SERVER["HTTP_X_FORWARDED_FOR"]} - Host: " . gethostbyaddr($_SERVER["HTTP_X_FORWARDED_FOR"]) . "\r\n";
    }

    if(isset($_SERVER["HTTP_X_FORWARDED"])) {
        $email .="_SERVER[HTTP_X_FORWARDED] = {$_SERVER["HTTP_X_FORWARDED"]} - Host: " . gethostbyaddr($_SERVER["HTTP_X_FORWARDED"]) . "\r\n";
    }

    if(isset($_SERVER["HTTP_FORWARDED_FOR"])) {
        $email .="_SERVER[HTTP_FORWARDED_FOR] = {$_SERVER["HTTP_FORWARDED_FOR"]} - Host: " . gethostbyaddr($_SERVER["HTTP_FORWARDED_FOR"]) . "\r\n";
    }

    if(isset($_SERVER["HTTP_FORWARDED"])) {
        $email .="_SERVER[HTTP_FORWARDED] = {$_SERVER["HTTP_FORWARDED"]} - Host: " . gethostbyaddr($_SERVER["HTTP_FORWARDED"]) . "\r\n";
    }

    $email .= "User Agent: {$_SERVER['HTTP_USER_AGENT']}\r\n";
    $email .= "Referred: {$_SERVER['HTTP_REFERER']}\r\n";

    mail($your_email, "We caught an attempted attacker!", $email);

?>