How to find all php files with encoding other than UTF-8?

Question

PHP

I found this command on the internet:

find ./ -type f | xargs -I {} bash -c "iconv -f utf-8 -t utf-16 {} &>/dev/null || echo {}" > utf8_fail

It does what I need, but it looks at all files, how can I make it look only php?
PS I myself am not strong in bash queries, what can I read about queries in an accessible language?

Answer 1

find ./ -type f -iname "*.php" | xargs -I {} bash -c "iconv -f utf-8 -t utf-16 {} &>/dev/null || echo {}" > utf8_fail

Answer 2

You can read man find .