这里有新鲜出炉的 PHP 教程,程序狗速度看过来!
PHP(外文名: Hypertext Preprocessor,中文名:"超文本预处理器")是一种通用开源脚本语言。语法吸收了 C 语言、Java 和 Perl 的特点,入门门槛较低,易于学习,使用广泛,主要适用于 web 开发领域。PHP 的文件后缀名为 php。
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'];
来源: http://www.phperz.com/article/17/0813/339963.html