PHP best practices going ahead

I have been considering a few things that one needs follow, do and have in their projects and applications and I came up with the below list:

1. Object Oriented Techniques and practices
2. Use of Interface Concept
3. TDD (Test Driven Development) based development both on the server and client side
4. Source code management tool like GIT
5. Language specific package management tool for managing dependencies. For example: Composer for PHP
6. Continuous Integration tool
7. Automated testing

There are many more, I might be missing. Please let me know in comments. :)