Get real user IP (PHP)

ip.php

function ip() {
	if (isset($_SERVER['HTTP_X_FORWARDED_FOR'])) {
		if (strpos($_SERVER['HTTP_X_FORWARDED_FOR'], ',') !== FALSE) {
			$ip = explode(',', $_SERVER['HTTP_X_FORWARDED_FOR']);
			return trim(end($ip));
		} else {
			return $_SERVER['HTTP_X_FORWARDED_FOR'];
		}
	} else {
		return $_SERVER['REMOTE_ADDR'];
	}
}