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Getting started with the Facebook PHP SDK v4.1. The complete code.
<?php
// Set the location of the Facebook PHP SDK - this should point to directory containing autoload.php
define( 'FACEBOOK_SDK_V4_SRC_DIR', './Facebook/' );
// include required files from Facebook SDK
require_once( 'Facebook/autoload.php' );
// start the session
session_start();
// setup application using API keys and handlers
$fb = new Facebook\Facebook([
'app_id' => 'xxx',
'app_secret' => 'yyy',
'http_client_handler' => 'curl', // can be changed to stream or guzzle
'persistent_data_handler' => 'session' // make sure session has started
]);
// login helper with redirect_uri
$helper = $fb->getRedirectLoginHelper();
// see if we have a code in the URL
if ( isset( $_GET['code'] ) ) {
// get new access token if we've been redirected from login page
try {
// get access token
$access_token = $helper->getAccessToken();
// save access token to persistent data store
$helper->getPersistentDataHandler()->set( 'access_token', $access_token );
} catch ( Exception $e ) {
// error occured
}
}
// get stored access token
$access_token = $helper->getPersistentDataHandler()->get( 'access_token' );
// check if we have an access_token, and that it's valid
if ( $access_token && !$access_token->isExpired() ) {
// set default access_token so we can use it in any requests
$fb->setDefaultAccessToken( $access_token );
try {
// If you provided a 'default_access_token', second parameter '{access-token}' is optional.
$response = $fb->get( '/me' );
// use $fb->post() to make a POST API call
} catch( Exception $e ) {
// catch any errors and halt script
echo $e->getMessage();
exit;
}
$me = $response->getGraphUser();
echo '<p>Logged in as ' . $me->getName() . '</p>';
echo '<pre>' . print_r( $me, 1 ) . '</pre>';
echo '<p><a href="' . $helper->getLogoutUrl( $access_token, 'http://sites.local/php-sdk-4.1/logout.php' ) . '">Logout of Facebook</a></p>';
} else {
// show login link
echo '<a href="' . $helper->getLoginUrl( 'http://sites.local/php-sdk-4.1/', ['email'] ) . '">Login using Facebook</a>';
}
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