IMP_Ftree_Prefs::offsetSet PHP Method

    public function offsetSet($offset, $value)
    {
        if (!$this->locked && $this[$offset] != $value) {
            if ($value) {
                $this->_data[strval($offset)] = true;
            } else {
                unset($this->_data[strval($offset)]);
            }
            Horde_Shutdown::add($this);
        }
    }