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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:


<html>
<head></head>
<body>

<?php
// include the package
include("Cache.php");
include("Cache/Application.php");

// 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">
</form>

<?php
// run destructor to save variables to cache
$cache->_Cache_Application();
?>

</body>
</html>


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.


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