First, I will give a brief explanation of what PHP is and what it can do.
For more information, visit: PHP.net

PHP is a Server Side Scripting Language. This means that your website's server needs PHP to be installed. I will show you an easy way to see if it is later on.

Here are a few FAQ about PHP that I got from php.net:

1. What is PHP?

PHP is an HTML-embedded scripting language. Much of its syntax is
borrowed from C, Java and Perl with a couple of unique PHP-specific
features thrown in. The goal of the language is to allow web developers
to write dynamically generated pages quickly. A nice introduction to PHP
by Stig Sæther Bakken can be found here on the Zend website. Also,
much of the PHP Conference Material is freely available.


2. What does PHP stand for?

PHP stands for PHP: Hypertext Preprocessor.

This confuses many people because the first word of the acronym is
the acronym. This type of acronym is called a recursive acronym.
The curious can visit Free On-Line Dictionary of Computing for more
information on recursive acronyms.


3. What are the differences between PHP 3 and PHP 4?

There are a couple of articles written on this by the authors of PHP 4.
Here's a list of some of the more important new features:

• Extended API module.
• Generalized build process under UNIX.
• Generic web server interface. Supports multi-threaded web servers.
• Improved syntax highlighter.
• Native HTTP session support.
• Output buffering support.
• More powerful configuration system.
• Reference counting.

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Now, Onto the tutorials!
[PHP Tutorial 1: Introduction]
[PHP Tutorial 2: Include Statement]
[PHP Tutorial 3: If-Then-Else Statement]
[PHP Tutorial 4: Switch Statement]
[PHP Tutorial 5: While Statement]