PHP文件缓存类

8/31/2015来源:PHP技巧人气:2497

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');