<?php
session_start();
          define ('PARSE_SDK_DIR', 'Parse/');
          require_once('Parse/autoload.php');
          use Parse\ParseClient;
          use Parse\ParseObject;
          use Parse\ParseQuery;
          use Parse\ParseACL;
          use Parse\ParsePush;
          use Parse\ParseUser;
          use Parse\ParseInstallation;
          use Parse\ParseException;
          use Parse\ParseAnalytics;
          use Parse\ParseFile;
          use Parse\ParseCloud;
$appid = "appid";
$restkey = "rest api id";
$masterkey = "master key";
ParseClient::initialize( $appid, $restkey, $masterkey);
ParseClient::setServerURL('https://parseapi.back4app.com', '/');


    //upload
    $fbUserObj = new ParseObject("fbUser");
    $fbUserObj->set("fbUserId",$user->id);
    $fbUserObj->save();

    //download
    $q->equalTo("fbUserId", $user->id);
    $r = $q->find();
    if(count($r)>0){
        echo "you are here!";
    }else{
        echo "you are not here!";
    }
}