Summary

This chapter introduced you to some of the most used code quality metrics in the PHP world. Furthermore, we presented you with the tools that help you gather them. Of course, there are many more that we could not cover in this book, but you do not have to know them all – you are now equipped with a solid understanding of code quality metrics that will help you in your daily working routine.

Code quality tools and metrics are surely no silver bullet for all problems. On the one hand, they can be extremely helpful for improving your code. On the other hand, you should not take them as the ultimate measure. There are numerous examples of successful types of software that would never pass these quality checks, such as WordPress. Be sure, though, that the creators of WordPress would have done things differently if they had known beforehand.

In the next chapter, we will leave the realm of theory. We will learn how to organize the tools that we introduced in the last...