PHP for the World Wide Web (Visual QuickStart Guide)

Chapter 4. Using Numbers

In Chapter 2, Variables, I loosely discussed the different types of variables , how to assign values to them, and how they are generally used. In this chapter, you will work specifically with number variables ”both integers (i.e., whole numbers) and floating-point (decimals). At the end of the section (see Using Built-in Mathematical Functions) I will demonstrate and introduce several more useful pre-existing functions available for manipulating numbers.