lithium\data\Collection::key PHP 메소드

    public function key($full = false)
    {
        if ($this->_started === false) {
            $this->current();
        }
        if ($this->_valid) {
            $key = key($this->_data);
            return is_array($key) && !$full ? reset($key) : $key;
        }
        return null;
    }