使用session_set_save_handler()函数,将Session的内容写入数据库
<?php
/*
*@author Fahy
*数据库为mysql,
*数据库名为session,表名为session,
*表中字段包括PHPSESSID,update_time,client_ip,data
*/
class Session{
private static $handler = null;
private static $ip = null;
private static $lifetime = null;
private static $time = null;
//配置静态变量
private static function init($handler){
self::$handler = $handler; //获取数据库资源
self::$ip = !empty($_SERVER["REMOTE_ADDR"])? $_SERVER["REMOTE_ADDR"]:'unkonw'; //获取客户端ip
self::$lifetime = ini_get('session.gc_maxlifetime'); //获取session生命周期
self::$time = time(); //获取当前时间
}
//调用session_set_save_handler()函数并开启session
static function start($pdo){
self::init($pdo);
session_set_save_handler(
array(__CLASS__,'open'),
array(__CLASS__,'close'),
array(__CLASS__,'read'),
array(__CLASS__,'write'),
array(__CLASS__,'destroy'),
array(__CLASS__,'gc')
);
session_start();
}
public static function open($path,$name){
return true;
}
public static function close(){
return true;
}
//查询数据库中的数据
public static function read($PHPSESSID){
$sql = "select PHPSESSID,update_time,client_ip,data from session where PHPSESSID=?";
$stmt = self::$handler->prepare($sql);
$stmt->execute(array($PHPSESSID));
if(!$result = $stmt->fetch(PDO::FETCH_ASSOC)){
return '';
}
if(self::$ip == $result['client_ip']){
self::destroy($PHPSESSID);
return '';
}
if(($result['update_time']+self::$lifetime) self::destroy($PHPSESSID); return ''; } return $result['data']; } /* *首先查询该session是否存在数据,如果存在,则更新数据,如果不存在,则插入数据 */ //将session写入数据库中,$data传入session中的keys和values数组 public static function write($PHPSESSID,$data){ $sql = "select PHPSESSID,update_time,client_ip,data from session where PHPSESSID=?"; $stmt = self::$handler->prepare($sql); $stmt->execute(array($PHPSESSID)); if($result=$stmt->fetch(PDO::FETCH_ASSOC)){ if($result['data'] != $data || self::$time > ($result['update_time']+30)){ $sql = "update session set update_time=?,data=? where PHPSESSID = ?"; $stmt = self::$handler->prepare($sql); $stmt->execute(array($self::$time,$data,$PHPSESSID)); } }else{ if(!empty($data)){ try{ $sql = "insert into session(PHPSESSID,update_time,client_ip,data) values(?,?,?,?)"; }catch(PDOException $e){ echo $e->getMessage(); } $sth = self::$handler->prepare($sql); $sth->execute(array($PHPSESSID,self::$time,self::$ip,$data)); } } return true; } public static function destroy($PHPSESSID){ $sql = "delete from session where PHPSESSID = ?"; $stmt = self::$handler->prepare($sql); $stmt->execute(array($PHPSESSID)); return true; } public static function gc($lifetime){ $sql = "delete from session where update_time<?"; $stmt = self::$handler->prepare($sql); $stmt->execute(array(self::$time-$lifetime)); return true; } } //使用PDO连接数据库 try{ $pdo = new PDO("mysql:host=localhost;dbname=session","root","hwj193"); }catch(PDOException $e){ echo $e->getMessage(); } //传递数据库资源 Session::start($pdo); 以上所述就是本文的全部内容了,希望大家能够喜欢。
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