Pusher Endpoint code sample

<?php

    session_start();
    header('Content-Type: application/json');
    require_once('pusher_info.php');

    if(!isset($_SESSION['user_id']))
    {
        $_SESSION['user_id'] = time();
    }
    $channel_name = $_POST['channel_name'];

    // check user has access to $channel_name
    echo $_pusher->presence_auth($channel_name, $_POST['socket_id'], $_SESSION['user_id'], array('id' => $_SESSION['user_id']));

?>