PHP useful cache class

 <?php
class Cache
{
    private $dir = "data/cache/";//定义缓存目录
    private $key='c_a_sss'; // 文件名 md5加密 密钥
    function set_dir($dirpath)
    {
        $this->dir=$dirpath;
        $this->make_dir($this->dir);
    }
    function read($key,$minutes=1)
    {
        $filename=$this->get_filename($key);
        if($datas = @file_get_contents($filename))
        {
            $datas = unserialize($datas);
            if(time() - $datas['time'] < $minutes*60)
            {
                return $datas['data'];
            }
        }
        return false;
    }

The cache is the buffer for data exchange (called Cache). When a piece of hardware wants to read data, it will first search for the required data from the cache. If it is found, it will be executed directly. If it cannot be found, it will be executed from the cache. Search in memory. Since the cache runs much faster than the memory, the role of the cache is to help the hardware run faster

Because the cache often uses RAM (non-permanent storage that is lost when power is turned off), so when it is used up In the end, the files will still be sent to storage such as hard drives for permanent storage. The largest cache in a computer is the memory stick. The fastest ones are the L1 and L2 caches built into the CPU. The video memory of the graphics card is a cache for the graphics card's computing chip. There is also a 16M or 32M cache on the hard disk.

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