get the actual IP of the user and pass via curl to generate the facebook token

1 – when I generate the facebook access token, I want to get the actual ip of the user that he is accessing at the moment and not the server ip see this example ( http://prntscr.com/o7qcxh ) 2 – when… (Budget: $10 – $30 USD, Jobs: Javascript, Linux, MySQL, PHP, Software Architecture)