Question

I am able to send app request using request dialog to 50 of a user’s friends with to= field modification but I want to send requests to all of a user’s friends like this example app does: Invite your friend button for pages

This app invites users first 50 friends than again invites users next 50 friends and so on

In my code I forward the users to this URL using PHP

https://www.facebook.com/dialog/apprequests?app_id=443468799026324
&to=" . $friend_ids .  "
&max_recipients=50&filters=app_non_users
&redirect_uri=" . urlencode($canvas_page2)  . "
&message=" . $message;

Facebook offical guide for request dialogue

How do I proceed from here?

Answer 1

You can do this as follow:
First you set 50 friends id in to parameter and store remaining friends id in cookie now when you send request then it redirects to your site url where you can repeat above step.i.e. send 50 friends request and store remaining in cookie.

var to="";
    for(var j=0 ; j< 50 && j<friends.length ; j++){
        if(friends[j].checked == true){
            to += friends[j].value;
            if(j != friends.length-1 && j != 49){
                to += ',';
            }
        }
    }
    var redirect_uri=your_site_url+"?button=inviteresponse";
    var callbackto="";
    for(var i=j;i<friends.length;i++){
        callbackto += friends[i].value;
        if(i != friends.length-1){
            callbackto += ',';
        }
    }
    document.cookie = "param="+callbackto+";path=/";
    var url="https://www.facebook.com/dialog/apprequests?app_id="+app_id+"&to="+to+"&message=Checkout apps&redirect_uri="+redirect_uri;
    window.open(url,'', 'width=900,height=500,resizable=yes,scrollbars=yes');  

case "inviteresponse":
        if (empty($_COOKIE['param'])) {
            unset($_COOKIE['param']);
            echo "<script type='text/javascript'>window.close();</script>";
            die();
        } else {
            $friends = explode(",", $_COOKIE["param"]);
            $to = "";
            for ($j = 0; $j < 50 && $j < count($friends); $j++) {
                $to .= $friends[$j];
                if ($j != count($friends) - 1 && $j != 49) {
                    $to .= ",";
                }
            }
            $redirect_uri = your_site_url+"?button=inviteresponse";
            $callbackto = "";
            for ($i = $j; $i < count($friends); $i++) {
                $callbackto .= $friends[$i];
                if ($i != count($friends) - 1) {
                    $callbackto .= ",";
                }
            }
            unset($_COOKIE['param']);
            setcookie("param", $callbackto);
            $url = "https://www.facebook.com/dialog/apprequests?app_id=" . APP_ID . "&to=" . $to . "&message=Checkout apps&redirect_uri=" . $redirect_uri;
            header("Location: " . $url);
        }