Question

i’m using this code to invite friends in my facebook application

$app_id = "000000000000000000000";
$canvas_page = "http://apps.facebook.com/applicationname/";
$message = "join me in this app.";
$requests_url = "https://www.facebook.com/dialog/apprequests?app_id=" 
            . $app_id . "&redirect_uri=" . urlencode($canvas_page)
            . "&message=" . $message;

     if (empty($_REQUEST["request_ids"])) {
        echo("<script> top.location.href='" . $requests_url . "'</script>");

every time the user call this page he can see all his friends
i need to view only the UNinvited friends.
how?

Answer 1

A better method would be to use the javascript SDK. You can use that to render a facebook popup with the share dialog inside…

With regard to your question, you can use filters for the apprequest method as stated here. You are looking for the app_non_users filter.

[EDIT]
If you want to filter even more – ie. don’t list friends that have already been invited (but not yet accepted), you’ll have to read each request_id generated and store the invited users facebook UID and place them in the exclude_ids filter. This method could be further optimized by using the javascript sdk and FB.ui() method, posting the generated request_ids using AJAX, reading the request_id server-side and returning the users UID to be added to a javascript array in order to be used in the exclude_ids filter for subsequent FB.ui() invite calls…