In simple way we can get remote IP address via
$_SERVER
[
'REMOTE_ADDR'
].
$ip = $_SERVER['REMOTE_ADDR'];
The above code will not work if your client is behind proxy server. In that case use below function to get real IP address of client.
function getRealIPAddr() { if (!empty($_SERVER['HTTP_CLIENT_IP'])) //check ip from share internet { $ip=$_SERVER['HTTP_CLIENT_IP']; } elseif (!empty($_SERVER['HTTP_X_FORWARDED_FOR'])) //to check ip is pass from proxy { $ip=$_SERVER['HTTP_X_FORWARDED_FOR']; } else { $ip=$_SERVER['REMOTE_ADDR']; } return $ip; }