Question

I am trying to make a Facebook app and need user id from Facebook when the user opens the applicaiton. I have setup my application and its show mock form on the Facebook canvas, I need help in connecting Facebook API to my page, would i need to download a API for that? And how do I get the user id from the JSON object which facebook says it sends to the application?

My test applcation is:

<?php

echo "this is working";

?> 

This is working on Facebook.

Answer 1

Download the PHP SDK

A very simple code example to get the user id – if the user is logged in and has authorised the application then $facebook->getUser() will give you the users id:

require 'facebook.php';

$facebook = new Facebook(array(
  'appId'  => 'YOUR_APP_ID',
  'secret' => 'YOUR_APP_SECRET',
));

// Get User ID
$user = $facebook->getUser();

if ($user) {
  try {
    // Get the user profile data you have permission to view
    $user_profile = $facebook->api('/me');
    echo "<pre>";
    print_r($user_profile);
    echo "</pre>";
  } catch (FacebookApiException $e) {
    $user = null;
  }
} else {
  die('<script>top.location.href="'.$facebook->getLoginUrl().'";</script>');
}

Take a look a the examples within the SDK and on the Facebook Developers Site.