<? Online-PHP::Tutorials ?>

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• Created: 14 Jun 11

  Integrate facebook login to website

  The source code looks like:

  <?php
  
  define('YOUR_APP_ID', 'your app id ');
  define('YOUR_APP_SECRET', 'your app secret');
  
  function get_facebook_cookie($app_id, $app_secret) {
    $args = array();
    parse_str(trim($_COOKIE['fbs_' . $app_id], '\\"'), $args);
    ksort($args);
    $payload = '';
    foreach ($args as $key => $value) {
      if ($key != 'sig') {
        $payload .= $key . '=' . $value;
      }
    }
    if (md5($payload . $app_secret) != $args['sig']) {
      return null;
    }
    return $args;
  }
  
  $cookie = get_facebook_cookie(YOUR_APP_ID, YOUR_APP_SECRET);
  
  $user = json_decode(file_get_contents(
      'https://graph.facebook.com/me?access_token=' .
      $cookie['access_token']));
  
  ?>

  <div id="fb-root"></div>
  <script>
  window.fbAsyncInit = function() {
      FB.init({appId: 'YOUR_APP_ID', status: true, cookie: true, xfbml: true});
   
      FB.Event.subscribe('auth.login', function(response) {
         login();
      });
      FB.Event.subscribe('auth.logout', function(response) {
         logout();
      });
      FB.getLoginStatus(function(response) {
         if (response.session) {
           greet();
         }
      });    
        
      function login() {
         FB.api('/me', function(response) {
    alert('You have successfully logged in, '+response.name+"!");
         });
      }
      function logout() {
         alert('You have successfully logged out!');
      }
      function greet() {
         FB.api('/me', function(response) {
           alert('Welcome, '+response.name+"!");
         });
      }    
  };
  (function() {
     var e = document.createElement('script');
     e.type = 'text/javascript';
     e.src = document.location.protocol + '//connect.facebook.net/en_US/all.js';
     e.async = true;
     document.getElementById('fb-root').appendChild(e);
  }());
  </script>
  <fb:login-button autologoutlink='true'  perms='email,user_birthday,status_update,publish_stream'></fb:login-button>
   
   
  Ofcourse make sure you change the YOUR_APP_ID and YOUR_APP_SECRET with your facebook app data.
   
  Enjoy