Group similar files in a project?

Question

Refactoring

There is an ancient PHP project that I am refactoring.
One of the problems with this code is that in order to implement similar features in different places, it was practiced to copy the file and finish it “on the spot”.
As a result, the code has 3-4 groups of 4-5 files with similar functionality
. Is there a utility (based on diff, for example), for example, that can find groups of similar files?

Answer 1

github.com/sebastianbergmann/phpcpd
or rather go through a set of all utilities as in CI jenkins-php.org/

Answer 2

3-4 by 4-5 is not so much, you can do it with your hands