Can you give links to mysql / php / linux problem books?

Question

linux

I would like to test my knowledge with interesting puzzles, perhaps with some tricks, and just to test algorithmic thinking. Tell me links to some problem books (whether in the form of books, online tests or a branch on a specialized forum) with interesting tasks (and not already boring tests from Zend), even better with solutions at the end (in order to test yourself in the end) .
Links to tests from Badoo , Mamba, tasks from Yandex (unless they are collected together) can not be thrown - I know them.
First of all, I am interested in the topics of PHP programming (not the basics, but all sorts of patterns, OOP, etc.), optimizing MySQL and the SQL query language, Linux administration. Well, JavaScript topics are also interesting (again, preferably not the basics), HTML, CSS.

Answer 1

Well, in SQL
SQL
Well, here
is quizful
A lot of tests on different topics

Answer 2

In more depth on PHP, I recommend this one: www.specialist.ru/test/414

Answer 3

There are quite a few different tests on brainbench.com, but they are paid, although free ones also slip through.