Optimize the use of mysql storage session_PHP tutorial

之前写过两篇文章《自定义SESSION（二）——数据库保存》和《我为什么不使用session》
  但后来发现都有问题。前者处理在实际中几乎没什么用处，而且session回收还得自己另外处理。后者频繁的操作数据库，打来了很大的性能问题。

  这两天仔细考虑下，大致给出一个方案，但还没有具体详细的测试。
  1、session处理和统计结合起来。同时游客也都有记录。
  2、完全使用数据库和cookie来模拟session的功能。
  3、用户的对session的操作都尽量保证在一条sql语句完成。不用到session的时候，绝对不多一条查询。
  4、为了效率起见，session的回收没有集成进来，但提供了接口，可以调用实现。

暂时给出代码，不具体解释。
sql

 

CREATE TABLE `*****_session` (
 `sid` char(32) NOT NULL,
 `uid` int(10) NOT NULL,
 `username` char(32) NOT NULL,
 `usertype` tinyint(1) NOT NULL,
 `activetime` int(10) NOT NULL,
 `expiry` int(10) NOT NULL,
 `ip` char(15) NOT NULL,
 `url` char(80) NOT NULL,
 `value` char(255) NOT NULL,
 PRIMARY KEY  (`sid`)
) ENGINE=MEMORY DEFAULT CHARSET=utf8;

 

php代码

class session{

private $_sessionPrex= ;//session prefix

private $_time = ;//current time

private $_model = null;//Database operation model

private $_expiry = 1200;//session validity time

private $_domain = ;//session scope

protected $isNew = 0;//Determine operation action 0 Update 1 Added

protected $session = array();//Corresponding session record

public function __construct($ options){
$this->_setOptions($options);
if(empty($this->_time))$this->_time = time();
$this-> ;session[activetime] = $this->_time;
}

public function start(){
$this->_getSid();
}

public function set($key,$value){
if(in_array($key,array(uid,username,usertype,url,expiry))){
if($key == expiry){
                       $this->_setCookie($this->_sessionPrex._sid,$this->session[sid],$value); ,$this->session[uid],$value);
                                                                                                                                                              ->session[value];
             $other[$key] = $value; > public function get($key){
if(in_array($key,array(uid,username,usertype,url,expiry))){
return $this->session[$key];
                                                                                                                                                                                           
          return null; if( $lasttime + $time<$this->_time){
                                                                                                                                                                                                                                   $this->_time);
}
}

public function destroy(){
$this->session[uid] = 0;
$this-> ;session[username] = ;
$this->session[usertype] = -1;
$this->session[expiry] = $this->_expiry;
$this-> ;session[value] = array();
$this->_setCookie($this->_sessionPrex._sid,$this->session[sid],$this->_expiry);
$this->_setCookie($this->_sessionPrex._uid,$this->session[uid],$this->_expiry);
}

public function __destruct(){
$this->_save();
}
   
    private function _save(){
        $dbSession = $this->session;
        $dbSession[value] = serialize($dbSession[value]);
        if(strlen($dbSession[value])>255)$this->_error(session->value is too long!);
        if($this->isNew == 1){
            //增加
            $this->_model->insert($dbSession);
        }else{
            //更新
            $sid = $dbSession[sid];
            $this->_model->update(array_slice($dbSession,1),sid=.$sid.);
        }
    }
   
    private function _getSession($sid){
        $dbSession = $this->_model->detail(sid = .$sid.);
        if(!$dbSession)return false;
        $dbSession[value] = unserialize($dbSession[value]);
        $this->session = array_merge($dbSession,$this->session);       
        return true;
    }
   
    private function _getSid(){
        $sid = strip_tags($_COOKIE[$this->_sessionPrex._sid]);
        if(strlen($sid)==32){
            if($this->_getSes

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