Throughout this chapter, we took a look at PHP's most popular package manager--Composer. We saw how easy it is to add third-party packages to our application, as well as distribute our own packages using the Packagist repository. A great deal of modern PHP applications rely on Composer, which is why understanding how to make the best of it is crucial to our day-to-day development efforts.
Moving forward, we will take a look at the types of testing applicable to PHP applications.