August 2012
Beginner
583 pages
16h 1m
English
Content preview from Learning PHP, MySQL, JavaScript, and CSS, 2nd EditionBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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Building Forms
Handling forms is a multipart process. First a form is created, into which a user can enter the required details. This data is then sent to the web server, where it is interpreted, often with some error checking. If the PHP code identifies one or more fields that require reentering, the form may be redisplayed with an error message. When the code is satisfied with the accuracy of the input, it takes some action that usually involves the database, such as entering details about a purchase.
To build a form, you must have at least the following elements:
An opening
<form>and closing</form>tagA submission type specifying either a
GETorPOSTmethodOne or more
inputfieldsThe destination URL to which the form data is to be submitted
Example 11-1 shows a very simple form created using PHP. Type it in and save it as formtest.php.
Example 11-1. formtest.php—a simple PHP form handler
<?php // formtest.php
echo <<<_END
<html>
<head>
<title>Form Test</title>
</head>
<body>
<form method="post" action="formtest.php">
What is your name?
<input type="text" name="name" />
<input type="submit" />
</form>
</body>
</html>
_END;
?>The first thing to notice about this example is that, as you have
already seen in this book, rather than dropping in and out of PHP code, I
generally use the echo
<<<_END..._END heredoc construct when multiline HTML
must be output.
Inside this multiline output is some standard code for commencing an HTML document, displaying its title, and starting the body of ...
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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.