Part 3: two new chapters!

Hello!

It is my great pleasure to offer you two more chapters of the PHP lessons. They are the beginning of the third part: "The full power of PHP". And this is not a lie. Although you've already discovered that PHP is a powerful language, you still don't know many very interesting things!

So, let's start with the first one. You will learn how to use one of the perhaps most useful function of PHP: include().
It is used in barely every website. It allows you to insert PHP code of one file into another. This is very useful for menus for example. Instead of copying the PHP code on each page where the menu is displayed, you simply use the include function to insert it where it belongs. Moreover, if you have to modify it, you'll only have to edit it once! Kinda interesting for you lazy programmers, isn't it?

The second one will teach you the use of many other PHP functions among which htmlspecialchars(), str_replace(), nl2br(). Let's make it clear: you won't be able to live without anymore!