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<?php
/**
* Phergie
*
* PHP version 5
*
* LICENSE
*
* This source file is subject to the new BSD license that is bundled
* with this package in the file LICENSE.
* It is also available through the world-wide-web at this URL:
* http://phergie.org/license
*
* @category Phergie
* @package Phergie_Plugin_Cache
* @author Phergie Development Team <team@phergie.org>
* @copyright 2008-2010 Phergie Development Team (http://phergie.org)
* @license http://phergie.org/license New BSD License
* @link http://pear.phergie.org/package/Phergie_Plugin_Cache
*/
/**
* Implements a generic cache to be used by other plugins.
*
* @category Phergie
* @package Phergie_Plugin_Cache
* @author Phergie Development Team <team@phergie.org>
* @license http://phergie.org/license New BSD License
* @link http://pear.phergie.org/package/Phergie_Plugin_Cache
*/
class Phergie_Plugin_Cache extends Phergie_Plugin_Abstract
{
/**
* Key-value data storage for the cache
*
* @var array
*/
protected $cache = array();
/**
* Stores a value in the cache.
*
* @param string $key Key to associate with the value
* @param mixed $data Data to be stored
* @param int|null $ttl Time to live in seconds or NULL for forever
* @param bool $overwrite TRUE to overwrite any existing value
* associated with the specified key
*
* @return bool
*/
public function store($key, $data, $ttl = 3600, $overwrite = true)
{
if (!$overwrite && isset($this->cache[$key])) {
return false;
}
if ($ttl) {
$expires = time()+$ttl;
} else {
$expires = null;
}
$this->cache[$key] = array('data' => $data, 'expires' => $expires);
return true;
}
/**
* Fetches a previously stored value.
*
* @param string $key Key associated with the value
*
* @return mixed Stored value or FALSE if no value or an expired value
* is associated with the specified key
*/
public function fetch($key)
{
if (!isset($this->cache[$key])) {
return false;
}
$item = $this->cache[$key];
if (!is_null($item['expires']) && $item['expires'] < time()) {
$this->expire($key);
return false;
}
return $item['data'];
}
/**
* Expires a value that has exceeded its time to live.
*
* @param string $key Key associated with the value to expire
*
* @return bool
*/
protected function expire($key)
{
if (!isset($this->cache[$key])) {
return false;
}
unset($this->cache[$key]);
return true;
}
}
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