php Cache 类

1、实例化

$cache = new Cache();

2、设置缓存时间和缓存目录

$cache = new Cache(60, '/any_other_path/');

第一个参数是缓存秒数，第二个参数是缓存路径，根据需要配置。
默认情况下，缓存时间是 3600 秒，缓存目录是 cache/

3、读取缓存

$value = $cache->get('data_key');

4、写入缓存

$value = $cache->put('data_key', 'data_value');

完整实例：

$cache = new Cache();//从缓存从读取键值 $key 的数据$values = $cache->get($key);//如果没有缓存数据if ($values == false) {//insert code here...//写入键值 $key 的数据$cache->put($key, $values);} else {//insert code here...}

<?phpclass Cache {private $cache_path;//path for the cacheprivate $cache_expire;//seconds that the cache expires//cache constructor, optional expiring time and cache pathpublic function Cache($exp_time=3600,$path="cache/"){$this->cache_expire=$exp_time;$this->cache_path=$path;}//returns the filename for the cacheprivate function fileName($key){return $this->cache_path.md5($key);}//creates new cache files with the given data, $key== name of the cache, data the info/values to storepublic function put($key, $data){$values = serialize($data);$filename = $this->fileName($key);$file = fopen($filename, 'w');    if ($file){//able to create the file        fwrite($file, $values);        fclose($file);    }    else return false;}//returns cache for the given keypublic function get($key){$filename = $this->fileName($key);if (!file_exists($filename) || !is_readable($filename)){//can't read the cachereturn false;}if ( time() < (filemtime($filename) + $this->cache_expire) ) {//cache for the key not expired$file = fopen($filename, "r");// read data file        if ($file){//able to open the file            $data = fread($file, filesize($filename));            fclose($file);            return unserialize($data);//return the values        }        else return false;}else return false;//was expired you need to create new }}?>