php实现Session存储到Redis
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RedisKEY-VALUE数据存储方案
首先新建一个session表
CREATETABLE`sessions`( `sid`char(40)NOTNULL, `updatetime`int(20)NOTNULL, `data`varchar(200)NOTNULL, UNIQUEKEY`sid`(`sid`)USINGHASH )ENGINE=MEMORYDEFAULTCHARSET=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";
classMySessionHandlerimplementsSessionHandlerInterface
{
private$savePath;
private$sessData;
public$expiretime;//设置过期时间
public$db;//数据库
publicfunction__construct($hanlder=''){
$this->db=Database::getInstance();
//获取数据库实力
///var_dump($this->db);
}
publicfunctionopen($savePath,$sessionName)
{
returntrue;
}
publicfunctionclose()
{
returntrue;
}
publicfunctionread($id)
{
$sql="select*fromsessionswheresid='$id'";
$result=$this->db->execute($sql);
if(!empty($result)){
return$this->sessData=$result;
}
}
//函数的参数$id->当前会话ID
//数据DATA->序列化之后的字符串
publicfunctionwrite($id,$data)
{
//echo$id;
//echo$data;
$now=time();
$newExp=$now+$this->expiretime;//总时间=当前时间+期限时间
$sql="select*fromsessionswheresid='$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
$sql="updatesessionssetupdatetime='$newExp',data='$data'wheresid='$id'";
//echo$sql;
$update_data=$this->db->execute($sql);
if($update_data){
returntrue;
}
}else{
//不存在则生成生成
$sql="insertintosessions(sid,updatetime,data)values('$id','$now','$data')";
$insert_data=$this->db->execute($sql);
if($insert_data){
returntrue;
}
}
returnfalse;
}
publicfunctiondestroy($id)
{//销毁
$sql="deletefromsessionswheresid="."$id";
$destory=$this->db->execute($sql);
if($destory){
returntrue;
}else{
returnfalse;
}
}
publicfunctiongc($sessMaxLifeTime)
{
$t=time();
$sql="deletefromsessionswhere$t-'updatetime'>${sessMaxLifeTime}";
$data=$this->db->execute($this->tosql);
if($data){
returntrue;
}else{
returnfalse;
}
returntrue;
}
}
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
<?php
classDatabase{
static$instance;
static$db;
staticfunctiongetInstance(){
if(self::$instance){
returnself::$instance;
}else{
returnnewDatabase();
}
}
publicfunction__construct(){
self::$db=newPDO('mysql:host=localhost;dbname=session','root','');
}
publicfunctiongetOne($sql){
$rs=self::$db->query($sql);
@$rs->setFetchMode(PDO::FETCH_ASSOC);//返回关联数组
$result=$rs->fetch();
return$result;
}
publicfunctionexecute($sql){
$rs=self::$db->exec($sql);
return$rs;
}
}
//$data=Database::getInstance();
//var_dump($data);
使用REDIS存储SESSION
<?php
classSessionManager{
private$redis;
private$sessionSavePath;
private$sessionName;
private$sessionExpireTime=30;
publicfunction__construct(){
$this->redis=newRedis();
$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($this,"gc")
);
session_start();
}
publicfunctionopen($path,$name){
returntrue;
}
publicfunctionclose(){
returntrue;
}
publicfunctionread($id){
$value=$this->redis->get($id);
if($value){
return$value;
}else{
return"";
}
}
publicfunctionwrite($id,$data){
if($this->redis->set($id,$data)){
$this->redis->expire($id,$this->sessionExpireTime);
//设置过期时间
returntrue;
}
returnfalse;
}
publicfunctiondestory($id){
if($this->redis->delete($id)){
returntrue;
}
returnfalse;
}
publicfunctiongc($maxlifetime){
returntrue;
}
//析构函数
publicfunction__destruct(){
session_write_close();
}
}
$re=newSessionManager();
$_SESSION['name']="qq";
echo$_SESSION['name'];
以上就是详细的介绍了php实现Session存储到Redis的方法，希望对大家的学习有所帮助。