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plugin/sns/facebook/changelog.md

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+Facebook PHP SDK (v.3.0.0)
+==========================
+
+The new PHP SDK (v3.0.0) is a major upgrade to the older one (v2.2.x):
+
+- Uses OAuth authentication flows instead of our legacy authentication flow
+- Consists of two classes. The first (class BaseFacebook) maintains the core of the upgrade, and the second one (class Facebook) is a small subclass that uses PHP sessions to store the user id and access token.
+
+If you’re currently using the PHP SDK (v2.2.x) for authentication, you will recall that the login code looked like this:
+
+     $facebook = new Facebook(…);
+     $session = $facebook->getSession();
+     if ($session) {
+       // proceed knowing you have a valid user session
+     } else {
+       // proceed knowing you require user login and/or authentication
+     }
+
+The login code is now:
+
+     $facebook = new Facebook(…);
+     $user = $facebook->getUser();
+     if ($user) {
+       // proceed knowing you have a logged in user who's authenticated
+     } else {
+       // proceed knowing you require user login and/or authentication
+     }
+