<?php    /* 实现session利用文件形式或者数据库等其它形式进行存储操作     * author:Libin     * Data:2014-06-24     * 抽象顶层    */    abstract class session {        /* open::设置存储路径 */        abstract public function open();        /* close::关闭存储模式句柄 */        abstract public function close();        /* read::根据key查询对应的value,典型的键值对 */        abstract public function read($key);        /* write::写session */        abstract public function write($key,$value);        /* destory::销毁某key的session */        abstract public function destory($key);        /* gc::回收机制，清除过期指定时间（分钟）session数据 */        abstract public function gc($min = 0);        /* start::开启session方法重写 */        abstract public function start();    }?>

<?php    /* 实现session利用文件形式或者数据库等其它形式进行存储操作     * author:Libin     * Data:2014-06-24     * 文本(txt)实现方法    */    class session_txt extends session {                /* 变量存储 */        private $save_path   = ‘‘;//session保存路径        private $file_path   = ‘‘;//session文件路径        private $save_name   = ‘‘;//session命名        private $save_hand   = null;//资源句柄        private $save_prefix = ‘mysession_‘;//session前缀                /* open::设置存储路径 */        final public function open(){            $this->save_path = ‘D:\session‘;            if(!is_dir($this->save_path)){                if(!mkdir($this->save_path)){                    return false;                };            }            $this->gc();//启用回收机制            return true;        }        /* close::关闭存储模式句柄 */        final public function close(){            return true;        }        /* read::根据key查询对应的value,典型的键值对 */        final public function read($key){            $this->set(__function__,$key);            $data = @fread($this->save_hand,filesize($this->file_path));            if(empty($data) || $data == ‘‘){                return ‘‘;            }return $data;        }        /* write::写session */        final public function write($key,$value){            $this->set(__function__,$key);            return @fwrite($this->save_hand,$value);        }        /* destory::销毁某key的session */        final public function destory($key){            $this->set(__function__,$key);            return @unlink($this->file_path);        }        /* gc::回收机制，清除过期指定时间（分钟）session数据 */        final public function gc($min = 10){            $hand = @opendir($this->save_path);//打开文件夹            while($file = @readdir($hand)){//遍历文件夹                if(is_file($this->save_path.‘/‘.$file)){//如果为文件，排除.||..                    $fileatime = fileatime($this->save_path.‘/‘.$file);//获取文件最后修改时间                    if(((time() - $fileatime) / 60) > $min){//如果时间相差大于$min分钟                        unlink($this->save_path.‘/‘.$file);//执行文件清理功能                    }                }            }            return true;        }                #################################################################################                /* MAGIC __SET */        final public function __set($key,$value){            $this->$key = $value;            return true;        }                /* 获取存储句柄 */        final private function set($mode = ‘read‘,$key){            $this->file_path = $this->save_path.‘/‘.$this->save_prefix.$key;//设置文件路径            if($mode != ‘read‘ && $mode != ‘write‘){return false;};            $mode = $mode == ‘write‘ ? ‘w‘ : ‘r‘;//读或写            $this->save_hand = @fopen($this->file_path,$mode);        }                /* start::开启session方法重写 */        final public function start(){            @session_set_save_handler(array($this,‘open‘),array($this,‘close‘),array($this,‘read‘),array($this,‘write‘),array($this,‘destory‘),array($this,‘gc‘));            ob_start();            session_start();            ob_end_flush();        }    }?>