PHP for the Web: Visual QuickStart Guide, Fourth Edition

10. Creating Functions

In This Chapter

Creating and Using Simple Functions 258

Creating and Calling Functions That Take Arguments 265

Setting Default Argument Values 271

Creating and Using Functions That Return a Value 274

Understanding Variable Scope 279

Review and Pursue 286

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

Creating functions can save you oodles of time as a programmer. In fact, they constitute a strong step in the process of creating Web ...