PHP facebook SDK 4.0 login error

Question

I was looking for docs on official page but there is no anything helpful, so i build this code and it don\'t work.

    FacebookSession::setDefaultApplication(\'a         


        

Answer 1

I agree, FB documentations are pretty bad. Also, they are frequently changing thier SDK versions, a few days back they release v 4.0.5. Try this ->

validate() ) {
      $session = null;
    }
  } catch ( Exception $e ) {
    // catch any exceptions
    $session = null;
  }

} else {
  // no session exists

  try {
    $session = $helper->getSessionFromRedirect();
  } catch( FacebookRequestException $ex ) {
    // When Facebook returns an error
  } catch( Exception $ex ) {
    // When validation fails or other local issues
    echo $ex->message;
  }

}

// see if we have a session
if ( isset( $session ) ) {

  // save the session
  $_SESSION['fb_token'] = $session->getToken();
  // create a session using saved token or the new one we generated at login
  $session = new FacebookSession( $session->getToken() );

  // graph api request for user data
  $request = new FacebookRequest( $session, 'GET', '/me' );
  $response = $request->execute();
  // get response
  $graphObject = $response->getGraphObject()->asArray();

  // print profile data
  echo '
' . print_r( $graphObject, 1 ) . '
';

  // print logout url using session and redirect_uri (logout.php page should destroy the session)
  echo 'Logout';

} else {
  // show login url
  echo 'Login';
}

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