facebook $facebook->getSignedRequest(); error

Question

i am trying to add this script to my iframe app on facebook but it seems not to work:

    $signed_request = $facebook->getSignedRequest();
$like_status =          


        

Answer 1

Facebook sends the signed request to your page when it is called from facebook.

So:

$signed_request = $_REQUEST["signed_request"];
list($encoded_sig, $payload) = explode('.', $signed_request, 2);
$data = json_decode(base64_decode(strtr($payload, '-_', '+/')), true);