lithium\data\collection\DocumentSet::modified PHP Method

    public function modified()
    {
        if (count($this->_original) !== count($this->_data)) {
            return true;
        }
        foreach ($this->_original as $key => $doc) {
            $updated = $this->_data[$key];
            if (!isset($updated)) {
                return true;
            }
            if ($doc !== $updated) {
                return true;
            }
            if (!is_object($updated) || !method_exists($updated, 'modified')) {
                continue;
            }
            $modified = $this->_data[$key]->modified();
            if (in_array(true, $modified)) {
                return true;
            }
        }
        return false;
    }