Code reuse: a great boon for web development. With large repositories of PHP code out there, from snippet archives to class databases, PHP is arguably one of the best languages when it comes to existing reusable code.
Of course, it isn’t nearly that simple. Everyone writes code differently; different naming conventions, different approaches to achieving common tasks (e.g. configuration), even different ways of interacting with the code (functions, classes static/non-static etc.). The problem is compounded when you start using a framework, with the intention of enforcing some basic convention - convention which your existing code libraries may not follow.
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