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@bmarshall511 bmarshall511/1457-1.php
Last active Aug 29, 2015

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<?php
// Must pass session data for the library to work (only if not already included in your app)
session_start();
// Facebook app settings
$app_id = '';
$app_secret = '';
$redirect_uri = '';
// Requested permissions for the app - optional
$permissions = array(
'email',
'user_location',
'user_birthday'
);
// Define the root directoy
define( 'ROOT', dirname( __FILE__ ) . '/' );
// Autoload the required files
require_once( ROOT . 'facebook-php-sdk-v4-4.0-dev/autoload.php' );
use Facebook\FacebookSession;
use Facebook\FacebookRedirectLoginHelper;
// Initialize the SDK
FacebookSession::setDefaultApplication( $app_id, $app_secret );
// Create the login helper and replace REDIRECT_URI with your URL
// Use the same domain you set for the apps 'App Domains'
// e.g. $helper = new FacebookRedirectLoginHelper( 'http://mydomain.com/redirect' );
$helper = new FacebookRedirectLoginHelper( $redirect_uri );
// Check if existing session exists
if ( isset( $_SESSION ) && isset( $_SESSION['fb_token'] ) ) {
// Create new session from saved access_token
$session = new FacebookSession( $_SESSION['fb_token'] );
// Validate the access_token to make sure it's still valid
try {
if ( ! $session->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;
}
}
// Check if a session exists
if ( isset( $session ) ) {
// Save the session
$_SESSION['fb_token'] = $session->getToken();
// Create session using saved token or the new one we generated at login
$session = new FacebookSession( $session->getToken() );
// Create the logout URL (logout page should destroy the session)
$logoutURL = $helper->getLogoutUrl( $session, 'http://yourdomain.com/logout' );
echo '<a href="' . $logoutURL . '">Log out</a>';
} else {
// No session
// Get login URL
$loginUrl = $helper->getLoginUrl( $permissions );
echo '<a href="' . $loginUrl . '">Log in</a>';
}
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