Code standards

[dungahk]

Should use a library to enforce code standards, e.g.

• https://github.com/squizlabs/PHP_CodeSniffer
• https://github.com/FriendsOfPHP/PHP-CS-Fixer

[kaystrobach]

• use the codacy pipeline integration for github
• add project, codacy is always executed and gives feedback

[kaystrobach]

• or use styleci, they also provide automated merge request generation, if bad code was inserted in the repo, to fix it.