关于HTTP头和访客IP

HTTP_CLIENT_IP:22.22.22.2
HTTP_X_FORWARDED_FOR:33.33.33.33
HTTP_REMOTE_ADDR:127.0.0.1

经过我亲测，只有REMOTE_ADDR不能伪造。

流行的判断IP的PHP代码:

function get_ip()

{

if(getenv('HTTP_CLIENT_IP')) {

$gb_ip = getenv('HTTP_CLIENT_IP');

}

elseif(getenv('HTTP_X_FORWARDED_FOR')) {

$gb_ip = getenv('HTTP_X_FORWARDED_FOR');

}

elseif(getenv('REMOTE_ADDR')) {

$gb_ip = getenv('REMOTE_ADDR');

}

else {

$gb_ip = $_SERVER['REMOTE_ADDR'];

}

return $gb_ip;

}