$ curl -OL https://squizlabs.github.io/PHP_CodeSniffer/phpcs.phar 
$ php phpcs.phar -h
Pfad zur Bibliothek angeben:

PHPStorm > Settings > Languages & Frameworks > PHP > Code Sniffer
Development environment: Local [...] bearbeiten
PHP Code Sniffer (phpcs) path: /Users/tnussbaum/bin/phpcs/vendor/bin/phpcs 

PHP Code Sniffer aktivieren:

PHPStorm > Settings > Editor > Inspections 
PHP > PHP Code Sniffer validaiton [check]