/**
* Check if an element has changed while saving.
*
* @param string $elementType
* @param int $id
* @param array $before
* @param array $after
*
* @return array
*/
public function elementHasChanged($elementType, $id, $before, $after)
{
// Flatten arrays
$flatBefore = ArrayHelper::flattenArray($before);
$flatAfter = ArrayHelper::flattenArray($after);
// Calculate the diffence
$flatDiff = array_diff_assoc($flatAfter, $flatBefore);
// Expand diff again
$expanded = ArrayHelper::expandArray($flatDiff);
// Add labels once again
$diff = array();
foreach ($expanded as $key => $value) {
$diff[$key]['label'] = isset($before[$key]) ? $before[$key]['label'] : '';
$diff[$key]['value'] = $value['value'];
}
// If there IS a difference
if (count($diff)) {
// Fire an "onElementChanged" event
$event = new Event($this, array('elementType' => $elementType, 'id' => $id, 'diff' => $diff));
$this->onElementChanged($event);
}
return $diff;
}
