Facebook API / PHP SDK / Login & more

Will be adding some basic information about using the current Facebook API with the PHP SDK.  Have been updating a lot of old API integrations over the past 2 months and finally solved many badly documented areas of the new API. Will be updating this in the future, as I dive deeper into the latest API changes.

Including the SDK (Github)

require_once _DIR_TO_AUTOLOAD.'/facebook_sdk/autoload.php';

 

use Facebook\FacebookSession;


use Facebook\FacebookRedirectLoginHelper;


use Facebook\FacebookRequest;


use Facebook\FacebookResponse;


use Facebook\FacebookSDKException;


use Facebook\FacebookRequestException;


use Facebook\FacebookAuthorizationException;


use Facebook\GraphObject;


use Facebook\Entities\AccessToken;


use Facebook\HttpClients\FacebookCurlHttpClient;


use Facebook\HttpClients\FacebookHttpable;

Depending on what you want to do with the API, the above needs to be adjusted. Check the Facebook API documentation for more details.

Basic Login / User data retrieval

// Session should be started after all files have been included 

session_start();

 
// init app with app id and secret
FacebookSession::setDefaultApplication( _FB_APP_ID_, _FB_APP_SECRET_ );

 
// login helper with redirect_uri

$helper = new FacebookRedirectLoginHelper( 'http://yourdomain.com/FB_LOGIN/');

 
// Check for Facebook redirect & retrieve session
try {

  $session = $helper->getSessionFromRedirect();


} catch( FacebookRequestException $ex ) {

  // When Facebook returns an error


} catch( Exception $ex ) {

  // When validation fails or other local issues

}
 
 

if ( isset( $session ) ) {

/* 
Store the session for later reuse, in this case even getting a long lived session. You should store this in your database.
The session can be reused with: 
$session = new FacebookSession($_SESSION['long']->getToken());
*/
 

if(empty($_SESSION['long'] )){

        $_SESSION['long'] = $session->getLongLivedSession();

}
// graph api request for user data
 
try {

 
    $user_profile = (new FacebookRequest(

      $session, 'GET', '/me'

    ))->execute()->getGraphObject(GraphUser::className());

 
    echo "Name: " . $user_profile->getName();

 
  } catch(FacebookRequestException $e) {

 
    echo "Exception occured, code: " . $e->getCode();

    echo " with message: " . $e->getMessage();

 
  }  

} else {

  // show login url if no session available

  // request special permissions, optional.


$params = array(

  'manage_pages', 'publish_pages','publish_actions','user_videos'


);

  echo '<a href="' . $helper->getLoginUrl($params ) . '">Login</a>';

}