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;

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>';
}

// 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>';

}

Facebook API / PHP SDK / Login & more

Including the SDK (Github)

Basic Login / User data retrieval

Alexander