In this chapter, we're going to have an overview of Yii 2, what has changed since the last version, with which you might have become comfortable its new directory structure and organization, as well as its new features and niceties.

We cannot introduce Yii 2 without looking at Composer, a new way to organize and extend your projects in PHP.

Once we have had a look at all the basic tools we're going to use, let's review our plan and consider what we will be working on in the rest of this book: user authentication REST interface and user login from a modal window.

In order to start working on our features, we need to step aside and review our plan from a project management and quality assurance point of view, that is, introduce the master test plan. In other words, we need to consider what we are going to test and how much before undertaking the actual implementation work.

We will be working through the following steps: