If the old version not contains an object or property, that is added.
If the old version contains an object or property less in last version, that is deleted.
/**
* Do a merge/combine between two object tree.
* If the old version not contains an object or property, that is added.
* If the old version contains an object or property less in last version, that is deleted.
*
* @brief Object delta compare for combine
*
* @param mixed $last_version Object tree with new or delete object/value
* @param mixed $old_version Current Object tree, loaded from serialize or database for example
*
* @return Object the delta Object tree
*
* @deprecated Since 1.2.0 Use WPDKObject::__delta() instead
*/
function wpdk_delta_object($last_version, $old_version)
{
_deprecated_function(__FUNCTION__, '1.2.0', 'WPDKObject::__delta()');
return WPDKObject::__delta($last_version, $old_version);
}
/**
* Do a delta compare/combine from two tree object config
*
* @brief Delta (align) object
*
* @return object
*/
public function delta()
{
// Check if exists a store version
$store_version = $this->get();
// Get subclass name
$subclass_name = get_class($this);
// Prepare an onfly instance
$delta = $instance = new $subclass_name($this->name);
if (!empty($store_version)) {
// In rare case could happen that the stored class is different from onfly class
if (!is_a($store_version, $subclass_name)) {
$this->delete();
call_user_func(array($instance, 'update'));
} else {
$delta = WPDKObject::__delta($instance, $store_version);
$delta->update();
}
}
return $delta;
}
