How to get the client IP address in PHP [duplicate]

Answer 1

Here is a cleaner code sample of a good way to get the IP address of the user.

$ip = $_SERVER['HTTP_CLIENT_IP'] ? $_SERVER['HTTP_CLIENT_IP'] : ($_SERVER['HTTP_X_FORWARDED_FOR'] ? $_SERVER['HTTP_X_FORWARDED_FOR'] : $_SERVER['REMOTE_ADDR']);

Here is a shorter version that uses the elvis operator:

$_SERVER['HTTP_CLIENT_IP'] ? : ($_SERVER['HTTP_X_FORWARDED_FOR'] ? : $_SERVER['REMOTE_ADDR']);

Here is a version that uses isset to remove notices (thank you, @shasi kanth):

$ip = isset($_SERVER['HTTP_CLIENT_IP']) ? $_SERVER['HTTP_CLIENT_IP'] : isset($_SERVER['HTTP_X_FORWARDED_FOR']) ? $_SERVER['HTTP_X_FORWARDED_FOR'] : $_SERVER['REMOTE_ADDR'];