Code about ThinkPHP file caching class

This article shares with you the code about the file cache class taken from ThinkPHP. It is very practical and efficient. It is recommended to everyone here for reference by friends in need.

The file caching class code is taken from ThinkPHP. There will be no more nonsense here. Friends, please read the comments yourself.

<?php
  /**
   * @desc 文件缓存
   */
  class Cache{
    const C_FILE = &#39;/Runtime/&#39;;
    private $dir = &#39;&#39;;
    const EXT = &#39;.tpl&#39;;
    private $filename = &#39;&#39;;
    public function __construct($dir = &#39;&#39;){
      $this->dir = $dir;
      
    }
    /**
     *  @desc 设置文件缓存
     *  @param string $key 文件名 
     *  @param unkonw $data 缓存数据
     *  @param int  $expire 过期时间
     */
    public function set($key,$data,$expire = 0){
      $this->filename =   dirname(__FILE__).self::C_FILE.$this->dir.$key.self::EXT;
      if(file_exists($this->filename)){
        $res = $this->get($key);
        if(md5($res) == md5(json_encode($data) ) ){
          return true;
        }
      }
      if(!is_dir(dirname($this->filename))){
        mkdir(dirname($this->filename),0777);
      }
      
      $source = fopen($this->filename,&#39;w+&#39;);
      fwrite($source,json_encode($data));
      fclose($source);
    }
    
    /**
     *  @desc 获取文件
     * @param string $key 文件名
     */
    public function get($key){
      //$filename = dirname(__FILE__).self::C_FILE.$this->dir.$key.self::EXT;
      if(!file_exists($this->filename)){
        return &#39;缓存文件已经不存在&#39;;
      }else{
        $res = file_get_contents($this->filename);
      }
      return $res;
    }
    /**
     *  @desc 删除文件
     * @param string $key 文件名
     */
    public function del($key){
      unlink($this->filename);
    }
    
  }
  
  $data = array(&#39;name&#39;=>&#39;song&#39;,&#39;age&#39;=>20,&#39;sex&#39;=>&#39;man&#39;,&#39;favority&#39;=>array(&#39;apple&#39;,&#39;banana&#39;));
  $cache = new Cache();
  $cache->set(&#39;cache&#39;,$data);
  //$cache->get(&#39;cache&#39;);
  //$cache->del(&#39;cache&#39;);

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