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  PHP: Building Concrete Validators

  Posted: December 21st, 2011, 6:00am MST

  Constructing purely static helper classes can hurt you, especially when you're trying to build applications that adhere to the principles of good object-oriented programming. As I explained extensively in the first part of this tutorial, static helpers are inflexible structures that can only be extended via Inheritance, and that don't exploit the benefits of Polymorphism or dependency injection. Naturally, the most educational way to learn why static helpers (or any other kind of static class, of course) should be replaced with instantiable classes is through some concrete, easy-to-foll...