“An access token is required to request this resource” while accessing an album / photo with Facebook php sdk

There are 3 things you need.

1. You need to oAuth with the owner of those photos. (with the ‘user_photos’ extended permission)

2. You need the access token (which you get returned in the URL box after the oAuth is done.)

3. When those are complete you can then access the photos like so https://graph.facebook.com/me?access_token=ACCESS_TOKEN

You can find all of the information in more detail here: http://developers.facebook.com/docs/authentication