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<?php  header("content-type:text/html;charset:utf-8");    require_once 'cache.class.php';    $dir = dirname(__FILE__).'/cache_data';    $cache = new Cache($dir);    $cache->add(1, 'test');    $cache->set(2, 'abc',60);    $cache->get(1);     if(!$cache->get(1)){      echo $cache->tip_message;  }else{      echo $cache->get(1);  }    $cache->delete(1);    $cache->flush();    $cache->auto_delete_expired_file();

cache.class.php ~ 7KB    下载(61)

<?php  // +----------------------------------------------------------------------  // |缓存类  // +----------------------------------------------------------------------  // | Author: justmepzy(justmepzy@gmail.com)  // +----------------------------------------------------------------------    class Cache{        //提示信息      public $tip_message;        //缓存目录      protected $cache_dir;      //缓存文件名      private $cache_file_name;      //缓存文件后缀      private $cache_file_suffix;        public function __construct($dir,$cache_file_suffix = '.php'){          $this->cache_dir = isset($dir)?$dir:dirname(__FILE__).DIRECTORY_SEPARATOR.'default_cache_data';            $this->cache_file_suffix = $cache_file_suffix;            if(!$this->dir_isvalid($this->cache_dir)){              die($this->tip_message);//创建目录失败          }        }      // +----------------------------------------------------------------------      // |添加一个值，如果已经存在，则返回false,写入文件失败返回false      // +----------------------------------------------------------------------      // |       // +----------------------------------------------------------------------      public function add($cache_key,$cache_value,$life_time=1800){           if(file_exists($this->get_cache_file_name($cache_key))){              $this->tip_message = '缓存数据已存在.';              return false;           }           $cache_data['data'] = $cache_value;           $cache_data['life_time'] = $life_time;           //以JSON格式写入文件           if(file_put_contents($this->get_cache_file_name($cache_key), json_encode($cache_data))){              return true;           }else{              $this->tip_message = '写入缓存失败.';              return false;           }        }      // +----------------------------------------------------------------------      // |添加一个值，如果已经存在，则覆写      // +----------------------------------------------------------------------      // |       // +----------------------------------------------------------------------      public function set($cache_key,$cache_value,$life_time=1800){            $cache_data['data'] = $cache_value;          $cache_data['life_time'] = $life_time;          if(file_put_contents($this->get_cache_file_name($cache_key), json_encode($cache_data))){              return true;           }else{              $this->tip_message = '写入缓存失败.';              return false;           }      }      // +----------------------------------------------------------------------      // |获取一个key值      // +----------------------------------------------------------------------      // |       // +----------------------------------------------------------------------      public function get($cache_key){          if(!file_exists($this->get_cache_file_name($cache_key))){              return false;          }          $data = $this->object_to_array(json_decode(file_get_contents($this->get_cache_file_name($cache_key))));            if($this->check_isvalid($data['life_time'])){              unset($data['life_time']);              return $data['data'];          }else{              unlink($this->cache_file_name);              $this->tip_message = '数据已过期.';              return false;          }         }      // +----------------------------------------------------------------------      // |删除一个key值      // +----------------------------------------------------------------------      // |       // +----------------------------------------------------------------------      public function delete($cache_key){          if(file_exists($this->get_cache_file_name($cache_key))){              if(unlink($this->get_cache_file_name($cache_key)))                  return true;              else                  return false;          }else{              $this->tip_message = '文件不存在.';              return true;          }      }      // +----------------------------------------------------------------------      // |清除所有缓存文件      // +----------------------------------------------------------------------      // |       // +----------------------------------------------------------------------      public function flush(){          $this->delete_file($this->cache_dir);      }      // +----------------------------------------------------------------------      // |自动清除过期文件      // +----------------------------------------------------------------------      // |       // +----------------------------------------------------------------------      public function auto_delete_expired_file(){          $this->delete_file($this->cache_dir,false);      }      // +----------------------------------------------------------------------      // |检查目录是否存在,不存在则创建      // +----------------------------------------------------------------------      // |       // +----------------------------------------------------------------------      private function dir_isvalid($dir){            if (is_dir($dir))               return true;          try {             mkdir($dir,0777);          }catch (Exception $e) {               $this->tip_message = '所设定缓存目录不存在并且创建失败!请检查目录权限!';               return false;                     }         return true;      }      // +----------------------------------------------------------------------      // |检查有效时间      // +----------------------------------------------------------------------      // |       // +----------------------------------------------------------------------      private function check_isvalid($expired_time = 0) {          //if(!file_exists($this->cache_file_name)) return false;          if (!(@$mtime = filemtime($this->cache_file_name))) return false;          if (time() -$mtime > $expired_time) return false;          return true;     }      // +----------------------------------------------------------------------      // |获得缓存文件名      // +----------------------------------------------------------------------      // |       // +----------------------------------------------------------------------      private function get_cache_file_name($key){          $this->cache_file_name = $this->cache_dir.DIRECTORY_SEPARATOR.md5($key).$this->cache_file_suffix;          return $this->cache_file_name;      }      // +----------------------------------------------------------------------      // |object对象转换为数组      // +----------------------------------------------------------------------      // |       // +----------------------------------------------------------------------      protected function object_to_array($obj){            $_arr = is_object($obj) ? get_object_vars($obj) : $obj;           foreach ($_arr as $key => $val) {               $val = (is_array($val) || is_object($val)) ? object_to_array($val) : $val;               $arr[$key] = $val;           }           return $arr;       }      // +----------------------------------------------------------------------      // |删除目录下的所有文件      // +----------------------------------------------------------------------      // | $mode true删除所有 false删除过期      // +----------------------------------------------------------------------      protected function delete_file($dir,$mode=true) {            $dh=opendir($dir);           while ($file=readdir($dh)) {               if($file!="." && $file!="..") {                   $fullpath=$dir."/".$file;                   if(!is_dir($fullpath)) {                       if($mode){                          unlink($fullpath);                       }else{                          $this->cache_file_name = $fullpath;                          if(!$this->get_isvalid_by_path($fullpath)) unlink($fullpath);                       }                    } else {                       delete_file($fullpath,$mode);                   }               }           }           closedir($dh);       }      private function get_isvalid_by_path($path){          $data = $this->object_to_array(json_decode(file_get_contents($path)));          return $this->check_isvalid($data['life_time']);      }  }  ?>