to get the correct IP address of the user

function getUserIpAddr(){
 if(!empty($_SERVER['HTTP_CLIENT_IP'])){
 //ip from share internet
        $ip = $_SERVER['HTTP_CLIENT_IP'];
 }elseif(!empty($_SERVER['HTTP_X_FORWARDED_FOR'])){
 //ip pass from proxy
        $ip = $_SERVER['HTTP_X_FORWARDED_FOR'];
 }else{
        $ip = $_SERVER['REMOTE_ADDR'];
 }
 return $ip;
}
echo 'User Real IP - '.getUserIpAddr();