lithium\data\entity\Document::next PHP Метод

    public function next()
    {
        $prev = key($this->_data);
        $this->_valid = next($this->_data) !== false;
        $cur = key($this->_data);
        if (isset($this->_removed[$cur])) {
            return $this->next();
        }
        if (!$this->_valid && $cur !== $prev && $cur !== null) {
            $this->_valid = true;
        }
        return $this->_valid ? $this->__get(key($this->_data)) : null;
    }