Yes, but I left it this way to keep messages the same for PHP < 5.5.0. And code of this method was taken directly from PHP manual. 

Does Symfony have some coding standard about private vs protected? [This](http://fabien.potencier.org/article/47/pragmatism-over-theory-protected-vs-private), or [this](https://groups.google.com/forum/#!topic/symfony-devs/WKDQFWIsE8s)?