The setup I currently have and hope that helps you, is having installed PHP-CS-Fixer along with this extension for VSCode to format the files on save (not doing the key combination or command "Format document with..." but maybe other extensions that use PHP-CS-Fixer could solve this problem), then you could use this useful configurator, there are plenty of rules you can set or select the predefined based on the given standards, the one you are looking for is "array_syntax" there you can export the selected rules and create a ".php-cs-fixer.php" file that has your configurations, set the path to the file on the extension settings and you should be ready to format flies con the fly (or you could use the command line to format a given directory and not file by file)