Logo         Community
The Company
Your Account
Contact Us
Caching Web Sites With PEAR Cache
Improve site performance with a PHP-driven cache

| Flava Of Da Month |

Just as you can cache pages, so too can you cache variables. The Cache_Application subclass lets you save application-level variables to the cache, and make them available to all instances of an application. This means that different users of an application can "share" variables with each other, even though their application instances are running in different sessions.

An example will make this clearer:


// include the package

// initialize cache
$cache = new Cache_Application("file", array("cache_dir" => "cache/"));

// if new flavour submitted
// save its value to the cache
if ($_POST['flava']) {
    $cache->register("flava", $_POST['flava']);

// get cached variables
$VARS =& $cache->getData();

// if required variable exists in cache
// print its value
if ($VARS['flava']) {
    echo "Current flavour: " . $VARS['flava'];

<form action="<?php echo $_SERVER['PHP_SELF']; ?>" method="post">
Enter a new flavour: <input name="flava" type="text">
<input type="submit" name="Save">

// run destructor to save variables to cache


Now, every time a new flavour is submitted, it is saved to the application cache as a variable. Because the cache is centralized and accessible to all application instances, new instances can read this variable by importing it into the $VARS array with getData(). These new instances may themselves alter the current flavour (even though they may be running in different sessions) and save the value back to the application cache.

Such application-level caching is very useful to make global configuration changes to a running application, because changes made by one instance (for example, the administrator instance) are immediately visible in all other instances.

How to do Everything with PHP & MySQL
How to do Everything with PHP & MySQL, the best-selling book by Melonfire, explains how to take full advantage of PHP's built-in support for MySQL and link the results of database queries to Web pages. You'll get full details on PHP programming and MySQL database development, and then you'll learn to use these two cutting-edge technologies together. Easy-to-follow sample applications include a PHP online shopping cart, a MySQL order tracking system, and a PHP/MySQL news publishing system.

Read more, or grab your copy now!

previous page more like this  print this article  next page
In trog...
Logging With PHP
Building A Quick-And-Dirty PHP/MySQL Publishing System
Output Buffering With PHP
Date/Time Processing With PHP
Creating Web Calendars With The PEAR Calendar Class
In the hitg report...
Crime Scenes
Animal Attraction
Lord Of The Strings
In boombox...
Patience - George Michael
Think Tank - Blur
My Private Nation - Train
In colophon...
Hostage - Robert Crais
The Dead Heart - Douglas Kennedy
Right As Rain - George Pelecanos
In cut!...
American Chai
The Core
Find out how you can use this article on your own Web site!

Copyright © 1998-2018 Melonfire. All rights reserved
Terms and Conditions | Feedback