Check Expirations

function check_expirations($field = null, $value = null, $single = false, $subsriber_id = false) {
        global $wpdb, $Db, $SubscribersList, $Subscriber, $Mailinglist;
        $conditions = array('paid' => "Y");

        if (!empty($single) && $single == true && !empty($subscriber_id)) {
            $conditions['subscriber_id'] = $subscriber_id;
        }

        $subscriberslists = $SubscribersList -> find_all(array('paid' => "Y"));

        if (!empty($subscriberslists)) {
            foreach ($subscriberslists as $sl) {
                if ($sl -> paid == "Y" && $sl -> ppsubscription != "Y") {
                    $mailinglist = $Mailinglist -> get($sl -> list_id, false);
                    $expiry = $Mailinglist -> gen_expiration_date($sl -> subscriber_id, $sl -> list_id);

                    if ($mailinglist -> interval != "once" && time() >= strtotime($expiry)) {
                        $conditions = array('subscriber_id' => $sl -> subscriber_id, 'list_id' => $sl -> list_id);
                        $this -> save_field('paid', "N", $conditions);
                        $this -> save_field('active', "N", $conditions);

                        $mailinglist = $Mailinglist -> get($sl -> list_id, false);
                        if ($mailinglist -> paid == "Y") {
                            $subscriber = $Subscriber -> get($sl -> subscriber_id, false);
                            $subscriber -> mailinglist_id = $sl -> list_id;
                            $subject = $this -> et_subject('expire');
                            $fullbody = $this -> et_message('expire');
                            $message = $this -> render_email(false, array('subscriber' => $subscriber, 'mailinglist' => $mailinglist), false, $this -> htmltf($subscriber -> format), true, $this -> default_theme_id(), false, $fullbody);
                            $this -> execute_mail($subscriber, $subject, $message, false, false, false, false);
                        }
                    }
                }
            }

            return true;
        }

        return false;
    }