How to identify 'dead code'

Questions
1

Silverstripe Version:
3.1
Question:

I’m new to SilverStripe and php but have to maintain an existing code base.
My first goal is to understand the existing code.

I’m assuming that several functions & complete php code files are actually no longer used.
Is there a trick to enable function call logging globally?
Or any other hint how to address the question with little effort?

2

You could use any PHP tool available for the job, see e.g. this StackOverflow answer for some idea.

Keep in mind static code analyzers can (and will) make mistakes: I would personally never use it, more so on big or unfamiliar codebases.

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