use php to check another users ipaddress code example
Example 1: php get user ip
$ip = $_SERVER['REMOTE_ADDR'];
Example 2: php get user ip address
#to best handle proxies use this:
if (!empty($_SERVER['HTTP_CLIENT_IP'])) {
$ip = $_SERVER['HTTP_CLIENT_IP'];
} elseif (!empty($_SERVER['HTTP_X_FORWARDED_FOR'])) {
$ip = $_SERVER['HTTP_X_FORWARDED_FOR'];
} else {
$ip = $_SERVER['REMOTE_ADDR'];
}