Goal of this issue is that Piwik sourcecode (PHP and ideally JS, CSS, HTML...) follows a coding standard. Ideally, the coding standard should be enforced in an automated fashion that does not take time from the developer (ie. fixes and suggestions are automatically applied by the computer rather than the human).

There are some tools available that can help us reformat our source code to be consistently styled:

• Styleci https://styleci.io/ (free for open source projects, StyleCI can automatically create a pull request with fixes applied)
• php-cs-fixer with psr-2 level, as was suggested in fix core folder with php-cs-fixer for psr-2 #7956