/**
* @param $blog_id
* @param $old_related
* @param $new_related
* @param $relations
* @param $changed
* @return int
*/
private function delete_unset_relations($blog_id, $old_related, $new_related, SiteRelations $relations, $changed)
{
// Delete removed relations.
foreach ($old_related as $old_blog_id) {
if (!in_array($old_blog_id, $new_related)) {
$relations->delete_relation($blog_id, $old_blog_id);
$changed += 1;
}
}
return $changed;
}