One thing the function reference with a full description of the arguments and examples (here it is clear that each language has its own directory), and another thing to collect it all into a big working system with a designed architecture. These principles have for many languages can be the same.
A good program in PHP or any other language, I think, includes the proper use of the functions in the correct architecture.
Functions php.net . Architecture and patterns of specific source will not name, but will distinguish the author — M. Fowler.
Patience and work — all will grind.