PHPBuilder.com has the next articles in their "ABCs of PHP" series posted today, a look at variables - what they are and how they're used.

To many beginners the subject of variables is usually pretty scary, and often a reasonably difficult concept to grasp, the reason for this however is usually because most modern languages require some kind of indication as to what type of data a variable will hold, this in turn often confuses beginners because they don't know what type of data relates to what kind of type.

They describe variables (using sample assignments like strings and numbers) and talk some about scope and how it affects their visibility. There's also a brief mention of the superglobals there close to the end.