Which books should I start with to learn computer Network programming, PHP, Perl and MySQL?

I want to learn network programming, scripting, web development using scripting languages. There are so many books in the market and every one of them claims to be the best. So I need first hand informations and tips to choose the correct book both for beginner's and advanced level users.

Which books should I start with to learn computer Network programming, PHP, Perl and MySQL?
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Reply:I learned the basics of PHP and SQL by looking at the tutorials on W3Schools, but for the most part I'd recommend downloading the official documentation, linked below. If you don't already have a program to run PHP and MySQL on your computer, I'd highly recommend XAMPP. Practicing with them is the best way to learn.