PHP for the Web: Visual QuickStart Guide, Fourth Edition

4. Using Numbers

In This Chapter

Creating the Form 74

Performing Arithmetic 77

Formatting Numbers 81

Understanding Precedence 84

Incrementing and Decrementing a Number 86

Creating Random Numbers 88

Review and Pursue 90

Chapter 2, “Variables,” briefly discussed the various types of variables, how to assign values to them, and how they’re generally used. In this chapter, you’ll work specifically with number variables—both integers (whole numbers) and floating-point numbers (aka floats or decimals).

The chapter begins by creating an HTML form that will be used to generate number variables. Then you’ll learn how to perform basic arithmetic, how to format numbers, and how to cope with operator precedence. The last two sections of this chapter cover ...