protected function _getLogChanges(XenForo_DataWriter $dw)
{
$newData = $dw->getMergedNewData();
$oldData = $dw->getMergedExistingData();
$changes = array();
foreach ($newData as $key => $newValue) {
if (isset($oldData[$key])) {
$changes[$key] = $oldData[$key];
}
}
return $changes;
}
