Prado\Web\UI\ActiveControls\TCallbackPageStateTracker::getChanges PHP Метод

    protected function getChanges()
    {
        $changes = array();
        foreach ($this->_states as $name => $details) {
            $new = $this->_control->getViewState($name);
            $old = $this->_existingState[$name];
            if ($new !== $old) {
                $diff = new $details[0]($new, $old, $this->_nullObject);
                if (($change = $diff->getDifference()) !== $this->_nullObject) {
                    $changes[] = array($details[1], array($change));
                }
            }
        }
        return $changes;
    }