對于大訪問量的站點使用默認的Session 并不合適，我們可以將其存入數據庫、或者使用Redis KEY-VALUE數據存儲方案
首先新建一個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引擎采用內存表，所有數據存儲在內存，操作速度快
<?php
//引入數據庫文件
include "db.php";
class MySessionHandler implements SessionHandlerInterface
{
private $savePath;
private $sessData;
public $expiretime; //設置過期時間
public $db; //數據庫
public function __construct($hanlder =''){
$this->db = Database::getInstance();
//獲取數據庫實力
///var_dump($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;
}
}
//函數的參數 $id -> 當前會話ID
//數據DATA -> 序列化之后的字符串
public function write($id, $data)
{
// echo $id;
// echo $data;
$now = time();
$newExp = $now+$this->expiretime; //總時間=當前時間 + 期限時間
$sql = "select * from sessions where sid ='$id'";
$result = $this->db->getOne($sql);
//var_dump($result);
if($data==''||isset($data)){
$data = $this->sessData;
}
if($result){
//如果存在則更新
$sql ="update sessions set updatetime = '$newExp',data ='$data' where sid = '$id'";
//echo $sql;
$update_data =$this->db->execute($sql);
if($update_data){
return true;
}
}else{
//不存在則生成生成
$sql = "insert into sessions(sid,updatetime,data) values('$id','$now','$data')";
$insert_data = $this->db->execute($sql);
if($insert_data){
return true;
}
}
return false;
}
public function destroy($id)
{ //銷毀
$sql = "delete from sessions where sid="."$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($data){
return true;
}else{
return false;
}
return true;
}
}
實例化
此處 PHP 手冊可以有兩種方法
1，實現了SessionHandlerInterface借口的對象,自PHP5.4可以使用
2 ，直接使用 session_set_save_handler
//判斷PHP版本
if(version_compare(PHP_VERSION,5.4)==1){
session_set_save_handler($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'];
數據庫代碼 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);//返回關聯數組
$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 存儲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); //連接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,$this->sessionExpireTime);
//設置過期時間
return true;
}
return false;
}
public function destory($id){
if($this->redis->delete($id)){
return true;
}
return false;
}
public function gc($maxlifetime){
return true;
}
//析構函數
public function __destruct(){
session_write_close();
}
}
$re = new SessionManager();
$_SESSION['name'] = "qq";
echo $_SESSION['name'];
以上就是本文的全部內容，希望對大家的學習有所幫助，也希望大家多多支持。
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