(When) should I use type hinting in PHP?

Question

I can\'t understand the motivation of PHP authors to add the type hinting. I happily lived before it appeared. Then, as it was added to PHP 5, I started specifying types eve

Answer 1

If you ever decide doing type hinting at least do it using interfaces instead of concrete or abstract classes. The reason is simple, PHP does not allow multiple inheritance but does allow implementing multiple interfaces. So if anyone tries to use your library it won't have difficulties implementing your interface as opposed to the case where he would have to extend your abstract/concrete class given that he already extends another already.