Retriving data from facebook snippet

reference : https://developers.facebook.com/docs/guides/canvas

note: create your own app in fb you will get appId and secret key

download here: https://github.com/facebook/facebook-php-sdk/blob/master/src/facebook.php
                        https://github.com/facebook/facebook-php-sdk/blob/master/src/base_facebook.php

require 'facebook.php'; // add this in your library and call it where u want to require

// Create our Application instance (replace this with your appId and secret).
$facebook = new Facebook(array(
  'appId'  => '2541542541254', //example appid
  'secret' => 'b9d6e03597d288e5605dd8060ed75be', //example secret key
));

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

if ($user) {   // Proceed knowing you have a logged in user who's authenticated.

  try {
    $user_profile = $facebook->api('/me');
    $user_friends = $facebook->api('/me/friends?fields=name');
     $user_interest = $facebook->api('/me?fields=interests');
     $user_permissions = $facebook->api('/me/permissions');
  } catch (FacebookApiException $e) {
    error_log($e);
    $user = null;
  }
}


// Login or logout url will be needed depending on current user state.
if ($user) {
  $logoutUrl = $facebook->getLogoutUrl();
} else {
  $loginUrl = $facebook->getLoginUrl();
}


print_r($user_profile); // we will get all the basic information from facebook,such as education,address,work etc.(according to the scope we will get the info from fb)