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