Summary

We have just covered the most advanced part of the theoretical section of this book. We are now armed with the knowledge to cut our code cleanly while keeping it maintainable and extensible for future developers. It will also be ready for the future by being strongly open to extension and closed to modification (as described in one of the SOLID principles).

We have reviewed many of the cases that you may encounter regarding the naming of files, classes, and methods when developing a PHP application. In addition, we have seen that folders must have specific names and can be used to divide your application into different domains.

The separation of responsibilities was also a big topic. It is particularly important to understand why this separation is useful, even vital, in a project. It is the real key to a well-architected project that is easy to navigate. Event dispatching is an excellent way to achieve this, as we have seen. Event dispatching is one of the cornerstones...