PHP文件缓存类

 1 <?php
 2     /**
 3      * @desc 文件缓存
 4      */
 5     class Cache{
 6         const C_FILE = ‘/Runtime/‘;
 7         private $dir = ‘‘;
 8         const EXT = ‘.tpl‘;
 9         private $filename = ‘‘;
10         public function __construct($dir = ‘‘){
11             $this->dir = $dir;
12             
13         }
14         /**
15          *    @desc 设置文件缓存
16          *    @param string $key 文件名 
17          *    @param unkonw $data 缓存数据
18          *    @param int    $expire 过期时间
19          */
20         public function set($key,$data,$expire = 0){
21             $this->filename =     dirname(__FILE__).self::C_FILE.$this->dir.$key.self::EXT;
22             if(file_exists($this->filename)){
23                 $res = $this->get($key);
24                 if(md5($res) == md5(json_encode($data) ) ){
25                     return true;
26                 }
27             }
28             if(!is_dir(dirname($this->filename))){
29                 mkdir(dirname($this->filename),0777);
30             }
31             
32             $source = fopen($this->filename,‘w+‘);
33             fwrite($source,json_encode($data));
34             fclose($source);
35         }
36         
37         /**
38          *    @desc 获取文件
39          *  @param string $key 文件名
40          */
41         public function get($key){
42             //$filename = dirname(__FILE__).self::C_FILE.$this->dir.$key.self::EXT;
43             if(!file_exists($this->filename)){
44                 return ‘缓存文件已经不存在‘;
45             }else{
46                 $res = file_get_contents($this->filename);
47             }
48             return $res;
49         }
50         /**
51          *    @desc 删除文件
52          *  @param string $key 文件名
53          */
54         public function del($key){
55             unlink($this->filename);
56         }
57         
58     }
59     
60     $data = array(‘name‘=>‘song‘,‘age‘=>20,‘sex‘=>‘man‘,‘favority‘=>array(‘apple‘,‘banana‘));
61     $cache = new Cache();
62     $cache->set(‘cache‘,$data);
63     //$cache->get(‘cache‘);
64     //$cache->del(‘cache‘);