What advice can you give to the existing code?

Question

PHP

Not so long ago I threw here my "bicycle" repository, which I am writing. I received a lot of constructive criticism, which helped me a lot. Now I'm doing it again to see how much my code has improved.
Here is a link to the repository: bitbucket.org/kfkdevelcenter/intranet-core
core/http I didn't write it, and I haven't touched it yet. Most interested in the opinion of the library for databases.

Answer 1

immediately note .idea should be ignored, and generally run through https://scrutinizer-ci.com , it will evaluate your code for you and produce it.