Prado\Web\UI\ActiveControls\TMapCollectionDiff::getDifference PHP 메소드

    public function getDifference()
    {
        if ($this->_old === null) {
            return $this->_new !== null ? $this->_new->toArray() : $this->_null;
        } else {
            $new = $this->_new->toArray();
            $old = $this->_old->toArray();
            $diff = array_diff_assoc($new, $old);
            return count($diff) > 0 ? $diff : $this->_null;
        }
    }