Question

My website application having feature login with Facebook login. And for which my app is present on Facebook. Login with facebook is working fine.

But application have feature of linking and unlinking facebook account to Facebook app.

• How to check FB account is linked with specific FB app or not?
• And how to unlink FB account from specific FB app if linked (On that user’s request )?

(“Linked” means we select “Allow” to FB app on request)

Answer 1

Please note Facebook in the process of deprecating the REST API, and have adding equivalent support to the Graph API User object for “auth.revokeAuthorization” method.

//$this->facebook is facebook object
//$userid is of logged in user or can be written hardcoded.
For checking linked in or not by making api call.

        $user_id = $this->facebook->getUser();
        $result = $this->facebook->api(array(
                'method' => 'fql.query',
                'query' => "SELECT is_app_user FROM user WHERE uid=$user_id"
        ));
        $is_installed = $result[0]['is_app_user'];
        if($is_installed==1) {
            echo 'Linked';
        }
        else {
            echo 'Not Linked';
        }


For delinking or deauthorization the user by making app call:

        $user_id = $this->facebook->getUser();
        $access_token=$this->facebook->getAccessToken();
        $result = $this->facebook->api(array(
                'method' => 'auth.revokeAuthorization',
                'uid' =>$user_id,
                'access_token'=>$access_token
        ));