March 2002
Intermediate to advanced
592 pages
15h 52m
English
Content preview from Web Database Applications with PHP, and MySQLBecome 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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PHP Session Management
In Chapter 8 we showed how to build session-based
applications using the PHP session management functions.
Applications use these functions to initialize sessions and register
session variables as shown in Example D-1. This
simple script initializes a session and registers two session
variables: count and start.
Example D-1. A simple PHP script that uses a session
<?php
// Initialize a session. This call either creates
// a new session or re-establishes an existing one.
session_start( );
// If this is a new session, then the variable
// $count is not registered
if (!session_is_registered("count"))
{
session_register("count");
session_register("start");
$count = 0;
$start = time( );
}
else
{
$count++;
}
$sessionId = session_id( );
?>
<!DOCTYPE HTML PUBLIC
"-//W3C//DTD HTML 4.0 Transitional//EN"
"http://www.w3.org/TR/html4/loose.dtd" >
<html>
<body>
<p>This page points at a session
(<?=$sessionId ?>)
<br>count = <?=$count ?>.
<br>start = <?=$start ?>.
<p>This session has lasted
<?php
$duration = time( ) - $start;
echo "$duration";
?>
seconds.
</body>
</html>By default, PHP manages sessions by storing session variables in files on disk and uses the session ID as part of the filename. The session management functions and file storage are discussed in more detail in Chapter 8.
PHP allows user-defined handlers to be written that change how sessions are managed. The handlers define how PHP starts and terminates sessions, stores and retrieves session variables, and ...
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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.