<?php
    // Written by Jckf.
    // This checks for proxy headers in the request, and the source
    // port of the connection against common proxy ports.

    if (
        array_key_exists('HTTP_X_FORWARDED_FOR',    $_SERVER)   ||
        array_key_exists('HTTP_X_FORWARDED',        $_SERVER)   ||
        array_key_exists('HTTP_FORWARDED_FOR',      $_SERVER)   ||
        array_key_exists('HTTP_CLIENT_IP',          $_SERVER)   ||
        array_key_exists('HTTP_VIA',                $_SERVER)   ||

        in_array($_SERVER['REMOTE_PORT'],array(8080,80,6588,8000,3128,553,554))
    ) {
        exit;
    }
?>