项目封装session会话类

1195 |

项目封装session会话类
在Lib目录下创建Session.class.php页面

<?php
namespace Lib;
class Session{
private $mypdo;
public function __construct() {
session_set_save_handler(
[$this,'open'],
[$this,'close'],
[$this,'read'],
[$this,'write'],
[$this,'destroy'],
[$this,'gc']
);
session_start();
}
public function open() {
$this->mypdo= \Core\MyPDO::getInstance($GLOBALS['config']['database']);
return true;
}
//关闭会话
public function close() {
return true;
}
//读取会话
public function read($sess_id) {
$sql="select sess_value from sess where sess_id='$sess_id'";
return (string)$this->mypdo->fetchColumn($sql);
}
//写入会话
public function write($sess_id,$sess_value) {
$sql="insert into sess values ('$sess_id','$sess_value',unix_timestamp()) on duplicate key update sess_value='$sess_value',sess_time=unix_timestamp()";
return $this->mypdo->exec($sql)!==false;
}
//销毁会话
public function destroy($sess_id) {
$sql="delete from sess where sess_id='$sess_id'";
return $this->mypdo->exec($sql)!==false;
}
//垃圾回收
public function gc($lifetime) {
$expires=time()-$lifetime; //过期时间点
$sql="delete from sess where sess_time<$expires";
return $this->mypdo->exec($sql)!==false;
}
}