At first let's take a look at two files:
index.php<?php session_start(); ?> <!doctype html> <html> <head> <meta charset="utf=8" /> <title>FB App</title> </head> <body> <?php define( 'FACEBOOK_SDK_V4_SRC_DIR', 'src/Facebook/'); require __DIR__ . '\autoload.php'; use Facebook\FacebookRedirectLoginHelper; $helper = new FacebookRedirectLoginHelper( 'http://localhost/app/back.php','APP_ID', 'APP_SECRET' ); echo '<a href="' . $helper->getLoginUrl() . '">Login with Facebook</a>'; ?> </body> </html>back.php<?php session_start(); ?> <?php define('FACEBOOK_SDK_V4_SRC_DIR', 'src/Facebook/'); require __DIR__ . '\autoload.php'; use Facebook\FacebookSession; use Facebook\FacebookRequest; use Facebook\GraphUser; use Facebook\FacebookRequestException; use Facebook\FacebookRedirectLoginHelper; FacebookSession::setDefaultApplication( 'APP_ID', 'APP_SECRET' ); $helper = new FacebookRedirectLoginHelper( 'http://localhost/app/back.php' ); try { $session = $helper->getSessionFromRedirect(); } catch(FacebookRequestException $ex) { // When Facebook returns an error } catch(\Exception $ex) { // When validation fails or other local issues } if ( $session ) { // Logged in. echo 'logged in'; echo '<hr/>'; // set session from cookie or via helper $user_id = $session->getSessionInfo()->asArray()['user_id']; $request = new FacebookRequest( $session, 'GET', '/' . $user_id ); $response = $request->execute(); $graphObject = $response->getGraphObject(); echo 'you are ' . $graphObject->getProperty( 'name' ); } ?> <!doctype html> <html> <head> <meta charset="utf=8" /> <title>FB App BACK</title> </head> <body> </body> </html>
Loging in proceeds successfully and I can see I'm logged in. Yet, when the page is reloaded I get Undefined variable: session in C:\wamp\www\app\back.php on line 21, it is line
if ( $session ) {
How to keep a session in the website consisting of multiple pages?