This is the sample code of a working canvas app that authenticates using facebook php sdk 4.0
Before using this snippet, you have to configure following variables:
$app_id = 'XXXX';
$app_secret = 'XXXX';
$app_namespace = 'XXXX';
$app_scope = 'user_location,email';When a person logs into your app via Facebook Login you can access a subset of that person's data stored on Facebook. Permissions are how you ask someone if you can access that data.
Permissions are strings that are passed along with a login request or an API call. $app_scope variable deals with the permissions.
Sample code has:
- email - Access to a person's primary email address.
- user_location - Provides access to a person's current city
This is just a minor portion of data you can obtain via API. For full list of possibilities read official facebook documentation.
These variables can be obained in the process of creating a new app in facebook development center.
You must provide https connection to your server, otherwise your app won't work.
Self signed certificate will not work and app will fail silently without any warning.