Where can I learn testing in PHP?

Question

PHP

Recommend useful materials ;)

Answer 1

Read in principle about testing, there is a lot of literature. Language binding is not really needed here.
Read the PHPUnit documentation , it's well written. There is also a partial translation (slightly old).
You can read about functional and integration tests first on the wiki and then google what is not clear, various articles, etc.
If you are interested in TDD, read Extreme Programming by Kent Beck. I really enjoyed the presentation of the material in this book. In the same place about refactoring in the context of TDD is well written.
If you are interested in BDD - behat.org

Answer 2

If the question is about testing my software, then I would also look towards codeception.com