Up until now we have familiarized ourselves with the latest changes in PHP 7, design patterns, design principles, and popular PHP frameworks. We also took a more detailed look into Symfony as our framework of choice moving forward. We have now finally reached a point where we can start building our modular application. Building modular applications with Symfony is done via the bundles mechanism. Terminology-wise, from this point on, we will consider bundle and module to be the same thing.
In this chapter we will be covering the following topics with respect to the core module:
Requirements
Dependencies
Implementation
Unit testing
Functional testing