function bigbluebuttonbn_is_moderator($user, $roles, $participants)
{
    $participant_list = json_decode(htmlspecialchars_decode($participants));
    if (is_array($participant_list)) {
        // Iterate looking for all configuration
        foreach ($participant_list as $participant) {
            if ($participant->selectiontype == 'all') {
                if ($participant->role == BIGBLUEBUTTONBN_ROLE_MODERATOR) {
                    return true;
                }
            }
        }
        //Iterate looking for roles
        $db_moodle_roles = bigbluebuttonbn_get_db_moodle_roles();
        foreach ($participant_list as $participant) {
            if ($participant->selectiontype == 'role') {
                foreach ($roles as $role) {
                    $db_moodle_role = bigbluebuttonbn_moodle_db_role_lookup($db_moodle_roles, $role->roleid);
                    if ($participant->selectionid == $db_moodle_role->shortname) {
                        if ($participant->role == BIGBLUEBUTTONBN_ROLE_MODERATOR) {
                            return true;
                        }
                    }
                }
            }
        }
        //Iterate looking for users
        foreach ($participant_list as $participant) {
            if ($participant->selectiontype == 'user') {
                if ($participant->selectionid == $user) {
                    if ($participant->role == BIGBLUEBUTTONBN_ROLE_MODERATOR) {
                        return true;
                    }
                }
            }
        }
    }
    return false;
}
/**
 * Returns an array with all the users enrolled in a given course
 *
 * @package  mod_bigbluebuttonbn
 * @return array a list of enrolled users in the course
 */
function bigbluebuttonbn_get_users($context)
{
    global $DB;
    $roles = bigbluebuttonbn_get_db_moodle_roles();
    $sqluserids = array();
    foreach ($roles as $role) {
        $users = get_role_users($role->id, $context);
        foreach ($users as $user) {
            array_push($sqluserids, $user->id);
        }
    }
    $users_array = array();
    if (!empty($sqluserids)) {
        $users_array = $DB->get_records_select("user", "id IN (" . implode(', ', $sqluserids) . ") AND deleted = 0");
    }
    return $users_array;
}