How I learned PHP or a new language after I have mastered one

I studied my first computer language (C) from undergraduate.  Then in graduate school, I learned Python, R etc by myself.

So, I mastered Python and R, got to know for basic usage of a language, I need to know hash table, loops, conditions  these things, and apply them to real world.

And then in my life, I need to learn PHP, so I started to learn PHP.

There are some good books on PHP, like this:

http://www.amazon.com/Learning-PHP-MySQL-JavaScript-Javascript/dp/1491918667/ref=sr_1_3?s=books&ie=UTF8&qid=1464735206&sr=1-3&keywords=php+and+mysql+web+development


And the book is thick, to finish it, takes time.

So, I read some tutorial, here are some tutorials I read:

 http://www.tutorialspoint.com/php/php_tutorial.pdf

http://prodevapp.com/ArmyPublicRelation/pdf/royalthaiarmynews/news_20141103173559.pdf

http://dashmeshedu.com/uploads/docNotice134.pdf

http://www.killerphp.com/downloads/object-oriented-php/downloads/oop_in_php_tutorial.pdf

http://www.cte.bilkent.edu.tr/~cte301/PHP_Notes_01.pdf

http://6.470.scripts.mit.edu/2012/assets/resources/php_ppt.pdf









Since, I know the languages' layout etc, I know what to learn for a new language, like how they use the loops, conditions, etc. Then I learned most of things about a programming language. But the book is still worth buying, you can systematically learn a programming language from a book.