<?php

function saveJSON($data){

file_put_contents('users.txt', base64_encode(serialize($data)));

}

function getJSON(){

if(file_exists('users.txt'))

return unserialize(base64_decode(file_get_contents('users.txt')));

else return NULL;

}

$secret = $_REQUEST['secret'];

if($secret == "GVO5Q32QJVUMESM4QOOXQG5FTS0WT5HCBTGBLLFAKI5JWM3T"){

$userData = getJSON();

$checkin = json_decode(stripslashes($_REQUEST['checkin']));

$userId = $checkin->user->id;

if(!isset($userData[$userId]))

$userData[$userId] = array();

if(isset($checkin->venue) && isset($checkin->venue->location)) {

$userData[$userId]['last-checkin'] = $checkin->venue->location;

saveJSON($userData);

}

else {

$userData[$userId]['last-checkin'] = NULL;

saveJSON($userData);

}

// echo json_encode($userData);

}

else echo "INVALID SECRET";