PHP-CS-Fixer in PHP-Storm

php-cs-fixer-as-tool

As an "External Tool"
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Settings -> Tools -> External Tools
Create a new Tool called "CS-Fixer" 
Program: Select your Docker executable
Arguments: run --rm -v $FilePath$:/$FileName$ cytopia/php-cs-fixer fix --rules=@PSR2 /$FileName$
OK -> Done

As a "File Watcher"
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Settings -> Tools -> File Watchers
Create new Watcher called "CS-Fixer"
Program: Select your Docker executable
Arguments: run --rm -v $FilePath$:/$FileName$ -v $ProjectFileDir$[[PATH_TO_YOUR_CS_CONFIG]]:/.php_cs cytopia/php-cs-fixer fix --config=/.php_cs /$FileName$
OK -> Done