Git: Changed File Names With Certain Extension

For example, how to find changed PHP files between latest and the commit before it: ¹

git diff --name-only HEAD~1 HEAD '**/*.php'

If the shell does not support the glob pattern, use grep

git diff --name-only HEAD~1 HEAD | grep .php

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1. https://stackoverflow.com/questions/4734300/git-changed-file-names-with-certain-extension ↩