April 2007
Intermediate to advanced
720 pages
12h 52m
English
Content preview from Ajax Bible
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Chapter 13
PHP: Functions and HTML Controls
IN THIS CHAPTER
- Creating functions
- Passing data to functions
- Creating default arguments
- Creating variable-length argument lists
- Returning data from functions
- Returning multiple items from a function
- Working with text fields, checkboxes, and radio buttons
- Handling multiple-selection HTML controls
- Uploading files
This chapter continues your guided tour of PHP with handling PHP functions and HTML controls. PHP functions are just as important in PHP as in JavaScript, but there's some added power in PHP compared to JavaScript. And working with HTML controls is the whole main point of using server-side scripting for many developers. You're going to see both in this chapter.
For an introduction to using PHP with Ajax, see Chapter 12.
Working with Functions
On the face of it, functions work much the same in PHP as in JavaScript. Here's how a function is set up:
function function_name([argument_list…])
{
[statements;]
[return return_value;]
}
It's easiest to see this with examples. For instance, you might want to use a function to display a copyright symbol at the bottom of your Web pages. You would start by displaying the Web page content like this:
<html>
<head>
<title>Using functions to create a copyright
mark</title>
</head>
<body>
<h1>Using functions to create a copyright mark</h1>
<?
echo “<h3>Welcome to my web page!</h3>”;
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.