proxydetect
===========
    Copyright (C) 2013 by Jan Helbling <jan.helbling@mailbox.org>
    This program is free software: you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation, either version 3 of the License, or
    (at your option) any later version.

    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with this program.  If not, see <http://www.gnu.org/licenses/>.



It checks the HTTP header (eg. $_SERVER["HTTP_X_FORWARDED_FOR"],$_SERVER["HTTP_VIA"]) to traces of proxys,
scans short 4 ports, to check whether it is a server
and compares a list of default proxy ports with $_SERVER["REMOTE_PORT"].
You can TEST this function at http://www.jan-helbling.ch/proxydetect.php

functions:
	check_if_proxy()
		-- returns the reason (String), which is detected why the visitor is using a proxy.
		-- returns false if the visitor isn't using a proxy.

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