A php mess detector ruleset file which is more compatible with CakePHP 3

The Mess Detector project aims to automatically find problems with your code, and highlight them to improve code quality.

Find out more at https://phpmd.org or github.com/phpmd/phpmd

• Copy the phpmd.xml file into your project root.
• Install phpmd composer require --dev phpmd/phpmd or globally with composer global require phpmd/phpmd

phpmd src/ text phpmd.xml --suffixes=php

"scripts": {
    "mess": "phpmd src/ text phpmd.xml --suffixes=php"
}

composer mess

In your settings, under Languages & Frameworks > PHP > Mess Detector set your 'Development environment' configuration to point to the correct executable, either in your projects 'vendor' folder, or you global folder.

Then in your settings, under Editor > Inspections > PHP add the phpmd.xml file to the Custom rulesets options.

There is an official guide also