PHP文件缓存类示例分享

<?php

    /**

     * @desc 文件缓存

     */

    class Cache{

        const C_FILE = '/Runtime/';

        private $dir = '';

        const EXT = '.tpl';

        private $filename = '';

        public function __construct($dir = ''){

            $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,'w+');

            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 '缓存文件已经不存在';

            }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('name'=>'song','age'=>20,'sex'=>'man','favority'=>array('apple','banana'));

    $cache = new Cache();

    $cache->set('cache',$data);

    //$cache->get('cache');

    //$cache->del('cache');