CODE EXAMPLE FOR PHP

php get client ip

function getClientIp(): string
{
    //whether ip is from the share internet
    if (!empty($_SERVER['HTTP_CLIENT_IP'])) {
        $ip = $_SERVER['HTTP_CLIENT_IP'];
    }
    //whether ip is from the proxy
    elseif (!empty($_SERVER['HTTP_X_FORWARDED_FOR'])) {
        $ip = $_SERVER['HTTP_X_FORWARDED_FOR'];
    }
    //whether ip is from the remote address
    else {
        $ip = $_SERVER['REMOTE_ADDR'];
    }
    return $ip;
}