php 获取客户端ip

function GetIP() {

if ($_SERVER["HTTP_X_FORWARDED_FOR"])

$ip = $_SERVER["HTTP_X_FORWARDED_FOR"];

else if ($_SERVER["HTTP_CLIENT_IP"])

$ip = $_SERVER["HTTP_CLIENT_IP"];

else if ($_SERVER["REMOTE_ADDR"])

$ip = $_SERVER["REMOTE_ADDR"];

else if (getenv("HTTP_X_FORWARDED_FOR"))

$ip = getenv("HTTP_X_FORWARDED_FOR");

else if (getenv("HTTP_CLIENT_IP"))

$ip = getenv("HTTP_CLIENT_IP");

else if (getenv("REMOTE_ADDR"))

$ip = getenv("REMOTE_ADDR");

else

$ip = "Unknown";

return $ip;

}

php 获取客户端ip

原文：http://my.oschina.net/drewin/blog/336749