IMP_Ftree::unsubscribe PHP Method

    public function unsubscribe($id)
    {
        if (is_array($id)) {
            /* We want to delete from the TOP of the tree down to ensure that
             * parents have an accurate view of what children are left. */
            $this->sortList($id);
            $id = array_reverse($id);
        } else {
            $id = array($id);
        }
        foreach ($id as $val) {
            /* INBOX can never be unsubscribed to. */
            if (($elt = $this[$val]) && !$elt->inbox) {
                $this->_changed = true;
                /* Do not delete from tree if there are child elements -
                 * instead, convert to a container element. */
                if ($elt->children) {
                    $this->setAttribute('container', $elt, true);
                }
                /* Set as unsubscribed, add to unsubscribed list, and remove
                 * from subscribed list. */
                $this->setAttribute('subscribed', $elt, false);
                /* Remove from polled list. */
                $this->poll->removePollList($elt);
            }
        }
    }