<?php

if ($HTTP_SERVER_VARS["HTTP_X_FORWARDED_FOR"]) {
	$ip = $HTTP_SERVER_VARS["HTTP_X_FORWARDED_FOR"];
} elseif ($HTTP_SERVER_VARS["HTTP_CLIENT_IP"]) {
	$ip = $HTTP_SERVER_VARS["HTTP_CLIENT_IP"];
} elseif ($HTTP_SERVER_VARS["REMOTE_ADDR"]) {
	$ip = $HTTP_SERVER_VARS["REMOTE_ADDR"];
} elseif (getenv("HTTP_X_FORWARDED_FOR")) {
	$ip = getenv("HTTP_X_FORWARDED_FOR");
} elseif (getenv("HTTP_CLIENT_IP")) {
	$ip = getenv("HTTP_CLIENT_IP");
} elseif (getenv("REMOTE_ADDR")) {
	$ip = getenv("REMOTE_ADDR");
} else {
	$ip = "未知";
}
echo "您的IP是：" . $ip;
$len = strlen($ip);
if ($len > 15) {
	echo "<br>您当前正在使用IPv6访问";
} else {
	echo "<br>您当前正在使用IPv4访问";
}