Detailed explanation of the method of storing PHPSession into database/redis

This article mainly introduces the method of PHP to implement Session storage/storage into redis. The editor thinks it is quite good, so I will share it with you now and give it as a reference. Let’s follow the editor and take a look.

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

First create a 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

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 in the PHP manual here

1. Object that implements the SessionHandlerInterface interface, since PHP5.4 You can use

2, directly use 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'];

database code db.php

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

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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