Usually before committing a file we need to check modified files against the code convention before committing to the code repository.
Here’s a single line to run modified files in Git against PHPCS.
git ls-files -m | grep '\.php$' | xargs ./vendor/bin/phpcs -s --standard=etc/phpcs/ruleset.xml
Code above assumes you install PHPCS using composer and have your own standard located in the etc/phpcs/ruleset.xml.
To check all uncommited files, run this
git ls-files --others --exclude-standard | grep '\.php$' | xargs ./vendor/bin/phpcs -s --standard=etc/phpcs/ruleset.xml