Are there manuals for creating a simple CMS in PHP + SQL that are relevant for 2016?

Question

CMS

I'm such a person, I'm used to getting acquainted with all things and digging into the code. I don't like textbooks, I don't remember anything from them. Only parsing real code helps.
Actually, now I decided not in theory, but in practice to understand how content management systems are built.
I would like to "disassemble" to see a simple CMS PHP + MySQL system, which has:
admin panel, the ability to add articles, a user system (registration, etc.)
Both the "source" and something like this will do , but I want see smart option. These manuals, judging by the comments, are not of very high quality, judging by the date of publication, they are not very relevant.
Actually, please tell me if there are any really high-quality unpretentious ones on the networkmanagement systems in PHP + SQL that are both easy to understand and not hacked in 5 minutes by any beginner? And preferably up-to-date... Laravel-type frameworks, while I'm not considering, I'm interested in native php. Parsing CMS is also not an option, I tried it, there are too many bells and whistles to understand. Google didn't help. If possible, I ask for links.
Something like the manual that I gave above is the ideal option, I took it apart and understood everything, everything works. One problem - I want to look at more relevant for 2016 and high-quality things and manuals, but lately the cat has somehow cried them.

Answer 1

Frameworks are exactly what you need. This is the very foundation from which CMS begins.

Answer 2

judging by the comments, not very high quality

Yes, you are delusional, so I also wrote a comment for you now, and I can write a couple of hundred more of these, so what?
Not “somehow”, but everything is very simple, they don’t pay money for it, people don’t do it, if you want something ready on a silver platter, look for paid courses, although they will write bad comments to you anyway.