PHP for the Web: Visual QuickStart Guide, Fifth Edition

10. Creating Functions

In This Chapter

Creating and Using Simple Functions

Creating and Calling Functions That Take Arguments

Setting Default Argument Values

Creating and Using Functions That Return a Value

Understanding Variable Scope

Review and Pursue

Throughout this book, you’ve used dozens of functions that provide much-needed functionality, such as date(), setcookie(), and number_format(). Although those functions have already been defined by PHP, here you’ll be creating your own. However, functions you’ve created and those built into PHP are used in the same manner.

Defining your own functions can save you oodles of time as a programmer. In fact, they constitute a big step in the process of creating web applications and building a solid ...