Clean Code PHP checker online
"Maintainability, efficiency and long term high performance PHP code is never on the mind of 99% of WordPress developers"
To become WordPress developer it doesn't take much. There are no skills, methodology, testing or benchmarking required other then "now it somehow works". WordPress is open source with GPL license, everybody is welcome, and that's great. The downdside of this poor standard in most of WordPress developments.
Have you got custom built plugin or theme? Check the PHP code made for you if it is written by Clean Code standard.