107 lines
2.7 KiB
PHP
107 lines
2.7 KiB
PHP
<?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;
|
|
}
|
|
}
|