Should You Read Old PHP Books?

Question

PHP

Now I'm learning php from Kevin Yank's book - PHP and MySQL. From beginner to pro, is it 2013 out of date? And is it worth continuing to learn php on it? It’s just that I’m looking at the code of other people on the network, everything is different for everyone and FIG understand who has it right, please tell me what to do

Answer 1

In practice - very often there are different versions of the same language... not everyone has time to "move" to the new version. (sometimes the transition takes years...)... and now you can safely find sites where php versions 4.x, 5.x are used... if you read it, it won't be bad - on the contrary, you will underline a lot of information that will probably come in handy once. It is impossible to remember everything - there are a lot of "little things", and the more such "little things" you know (especially in different versions of php), the easier it will be for you to work with any task.
ps as far as I remember... now the modern version of php is 7
p.s.s. it took about 5 months for the host I use to be able to use the version of php7 with php5.6 (since the official release of php7) before the host "updated" their server configuration to php7.
p.s.s.s. perfectly correct code is a "style" for a given language, developed by you over the years (through a huge number of your mistakes) with accumulated experience and knowledge. Therefore, you should not particularly "bother" with "correctness", especially since php is a very untyped language and allows you to "code" very flexibly.
p.s.s.s.s. php version 6.x does not exist

Answer 2

Should I read old books on ***?

NO. While you study the old, the current new may become obsolete, and the old may go out of use.