本篇文章主要介绍了php实现session入库/存入redis的方法，小编觉得挺不错的，现在分享给大家，也给大家做个参考。一起跟随小编过来看看吧
对于大访问量的站点使用默认的session 并不合适，我们可以将其存入数据库、或者使用redis key-value数据存储方案
首先新建一个session表
create table `sessions` (
`sid` char(40) not null,
`updatetime` int(20) not null,
`data` varchar(200) not null,
unique key `sid` (`sid`) using hash
) engine=memory default charset=utf8;
mysql 的memory引擎采用内存表，所有数据存储在内存，操作速度快
<?php
//引入数据库文件
include "db.php";
class mysessionhandler implements sessionhandlerinterface
{
private $savepath;
private $sessdata;
public $expiretime; //设置过期时间
public $db; //数据库
public function __construct($hanlder =''){
$this->db = database::getinstance();
//获取数据库实力
///var_dump($this->db);
}
public function open($savepath, $sessionname)
{
return true;
}
public function close()
{
return true;
}
public function read($id)
{
$sql ="select * from sessions where sid ='$id'";
$result = $this->db->execute($sql);
if(!empty($result)){
return $this->sessdata = $result;
}
}
//函数的参数 $id -> 当前会话id
//数据data -> 序列化之后的字符串
public function write($id, $data)
{
// echo $id;
// echo $data;
$now = time();
$newexp = $now+$this->expiretime; //总时间=当前时间 + 期限时间
$sql = "select * from sessions where sid ='$id'";
$result = $this->db->getone($sql);
//var_dump($result);
if($data==''||isset($data)){
$data = $this->sessdata;
}
if($result){
//如果存在则更新
$sql ="update sessions set updatetime = '$newexp',data ='$data' where sid = '$id'";
//echo $sql;
$update_data =$this->db->execute($sql);
if($update_data){
return true;
}
}else{
//不存在则生成生成
$sql = "insert into sessions(sid,updatetime,data) values('$id','$now','$data')";
$insert_data = $this->db->execute($sql);
if($insert_data){
return true;
}
}
return false;
}
public function destroy($id)
{ //销毁
$sql = "delete from sessions where sid="."$id";
$destory = $this->db->execute($sql);
if($destory){
return true;
}else{
return false;
}
}
public function gc($sessmaxlifetime)
{
$t = time();
$sql ="delete from sessions where $t - 'updatetime'>${sessmaxlifetime}";
$data = $this->db->execute($this->tosql);
if($data){
return true;
}else{
return false;
}
return true;
}
}
实例化
此处 php 手册可以有两种方法
1，实现了sessionhandlerinterface借口的对象,自php5.4可以使用
2 ，直接使用 session_set_save_handler
//判断php版本
if(version_compare(php_version,5.4)==1){
session_set_save_handler($handler, true);
session_start();
}else{
ini_set('session.use_trans_sid',0);
ini_set('session.use_cookies',1);
ini_set('session.cookie_path','/');
ini_set('session.save_handler','user');
session_module_name('user');
session_set_save_handler(array($session,"open"),array($session,"close"),array($session,"read"),array($session,"write"),array($session,"destory"),array($session,"gc"));
session_start();
}
$_session['qq']="qq";
echo $_session['qq'];
数据库代码 db.php
<?php
class database{
static $instance;
static $db;
static function getinstance(){
if(self::$instance){
return self::$instance;
}else{
return new database();
}
}
public function __construct(){
self::$db = new pdo('mysql:host=localhost;dbname=session', 'root','');
}
public function getone($sql){
$rs =self::$db->query($sql);
@$rs->setfetchmode(pdo::fetch_assoc);//返回关联数组
$result = $rs -> fetch();
return $result;
}
public function execute($sql){
$rs = self::$db->exec($sql);
return $rs;
}
}
//$data = database::getinstance();
//var_dump($data);
使用redis 存储session
<?php
class sessionmanager{
private $redis;
private $sessionsavepath;
private $sessionname;
private $sessionexpiretime = 30;
public function __construct(){
$this->redis = new redis();
$this->redis->connect('127.0.0.1',6379); //连接redis
$retval = session_set_save_handler(
array($this,"open"),
array($this,"close"),
array($this,"read"),
array($this,"write"),
array($this,"destory"),
array($this,"gc")
);
session_start();
}
public function open($path,$name){
return true;
}
public function close(){
return true;
}
public function read($id){
$value = $this->redis->get($id);
if($value){
return $value;
}else{
return "";
}
}
public function write($id,$data){
if($this->redis->set($id,$data)){
$this->redis->expire($id,$this->sessionexpiretime);
//设置过期时间
return true;
}
return false;
}
public function destory($id){
if($this->redis->delete($id)){
return true;
}
return false;
}
public function gc($maxlifetime){
return true;
}
//析构函数
public function __destruct(){
session_write_close();
}
}
$re = new sessionmanager();
$_session['name'] = "qq";
echo $_session['name'];
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以上就是phpsession入库/存入redis的方法详解的详细内容。