fb:visible-to-connection not working?

Hi i have created new iFrame APP.

this is code part:

<fb:visible-to-connection>Welcome, fans!<fb:else>Become fan</fb:else></fb:visible-to-connection>

<script src="http://connect.开发者_运维知识库facebook.net/en_US/all.js"></script>

Can anyone help me out??

I also tried doing this with newest Facebook PHP SDK. Unfortunately i can check it first i user accepted the APP, which is not the point in this case.

I am almost sure that is not working anymore.

To detect a like or non-liker you can use the signed request to get that data. It gets passed to a tab when it is loaded.

<?php
$signed_request = $_REQUEST["signed_request"];

list($encoded_sig, $payload) = explode('.', $signed_request, 2);
$data = json_decode(base64_decode(strtr($payload, '-_', '+/')), true);
?>

Then in the body of your HTML:

<?php
    if ($data["page"]["liked"]!=1) {
        echo('<div id="NON_LIKER_CONTENT"> <img src="nonliker.jpg" width="520"/></div>');
    }  else {
        echo('<div id="LIKER_CONTENT"> <img src="liker.jpg" width="520"/></div>');
    }
 ?>