PHP implements Session storage to Redis, sessionredis_PHP tutorial

PHP implements Session storage in Redis, sessionredis

It is not appropriate to use the default Session for sites with large visits. We can store it in the database or use Redis KEY- VALUE data storage solution
First create a new session table

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’s memory engine uses memory tables, all data is stored in memory, and the operation speed is fast

<&#63;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;
  }
}

Instantiation

There are two methods for PHP manual here
1. An object that implements the SessionHandlerInterface interface and can be used since PHP5.4
2. Use session_set_save_handler
directly

 //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'];

Database code

<&#63;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);

Use REDIS to store SESSION

<&#63;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'];

The above is a detailed introduction to the method of storing Session to Redis in PHP. I hope it will be helpful to everyone's learning.

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