This class can be used to store and retrieve cached values from single file. It can store one or more keys in a single cache file. The class can also look up for a given key and retrieve the store value.

It can lock the file during access to prevent corruption, but there is also a sub-class that can be used to access the cache file without locking it.

It can automatically clean-up the least recently used entries to free space

• 纯php实现, 无须任何扩展，支持php4 / 5
• 使用lru算法自动清理过期内容
• 可以安全用于多进程并发
• 最大支持1G缓存文件
• 使用hash定位，读取迅速

用法样例

require('../secache/secache.php');
$cache = new secache;
$cache->workat('cachedata');

$key = md5('test'); //必须自己做hash，前4位是16进制0-f,最长32位。
$value = '值数据'; //必须是字符串

$cache->store($key,$value);

if($cache->fetch($key,$return)){
    echo '<li>'.$key.'=>'.$return.'</li>';
}else{
    echo '<li>Data get failed! <b>'.$key.'</b></li>';
}

• 键需要自己做hash处理,最长32位.
• 值必须是字符串。如果要存对象，请自己serialize

• shopex购物系统

April 2010 Number 4