php文件缓存类用法实例分析
这篇文章主要介绍了php文件缓存类用法,以实例形式较为详细的分析了php文件缓存类的定义、功能及具体使用技巧,非常具有实用价值,需要的朋友可以参考下
本文实例讲述了php文件缓存类用法,分享给大家供大家参考,具体如下:
- <?php
- /**
- * 简单的文件缓存类
- *
- */
- class XZCache{
- // default cache time one hour
- var $cache_time = 3600;
- // default cache dir
- var $cache_dir = './cache';
- public function __construct($cache_dir=null, $cache_time=null){
- $this->cache_dir = isset($cache_dir) ? $cache_dir : $this->cache_dir;
- $this->cache_time = isset($cache_time) ? $cache_time : $this->cache_time;
- }
- public function saveCache ($key, $value){
- if (is_dir($this->cache_dir)){
- $cache_file = $this->cache_dir . '/xzcache_' . md5($key);
- $timedif = @(time() - filemtime($cache_file));
- if ($timedif >= $this->cache_time) {
- // cached file is too old, create new
- $serialized = serialize($value);
- if ($f = @fopen($cache_file, 'w')) {
- fwrite ($f, $serialized, strlen($serialized));
- fclose($f);
- }
- }
- $result = 1;
- }else{
- echo "Error:dir is not exist.";
- $result = 0;
- }
- return $result;
- }
- /**
- * @return array
- * 0 no cache
- * 1 cached
- * 2 overdue
- */
- public function getCache ($key) {
- $cache_file = $this->cache_dir . '/xzcache_' . md5($key);
- if (is_dir($this->cache_dir) && is_file($cache_file)) {
- $timedif = @(time() - filemtime($cache_file));
- if ($timedif >= $this->cache_time) {
- $result['cached'] = 2;
- }else{
- // cached file is fresh enough, return cached array
- $result['value'] = unserialize(file_get_contents($cache_file));
- $result['cached'] = 1;
- }
- }else {
- echo "Error:no cache";
- $result['cached'] = 0;
- }
- return $result;
- }
- } //end of class
用法示例如下:
- $cache = new XZCache();
- $key = 'global';
- $value = $GLOBALS;
- $cache->saveCache($key, $value);
- $result = $cache->getCache($key);
- var_dump($result);