Hey,
I've written some stuff about my experiences with PHPCS and PHPMD in the context of MediaWiki development, which might be of interest to people here.
http://www.bn2vs.com/blog/2015/02/20/phpcs-and-phpmd-my-experiences/
Also, in case you want to see how easy it is to add these tools to a MediaWiki extension, see https://github.com/SemanticMediaWiki/SemanticMetaTags/pull/25/files
Cheers
-- Jeroen De Dauw - http://www.bn2vs.com Software craftsmanship advocate Evil software architect at Wikimedia Germany ~=[,,_,,]:3