A talk about practical ways to tackle code quality, massive refactoring, testing and automatic documentation generation. I'll present open source tools, cases and insights.

I've worked with legacy systems written in PHP for 10 years, and the last 4 were dedicated to a 14-yo monolith, maintained by multiple teams and visited by millions of users per week.

In this talk I show different techniques and tools I used throughout my career that helped me modernising systems I worked with without losing my sanity.

We'll talk about how to:
- ship features without fearing massive failures;
- decommission code safely;
- perform massive refactorings;
- level up your documentation game with automated documentation generation;
- test legacy systems

As usual, I will also leave some important references such as articles and books.