PHP implements session sharing function under load balancing PHP skills

This article mainly introduces the session sharing function under PHP's load balancing, and analyzes the related implementation techniques of PHP's memcache-based session sharing in the form of examples. Friends in need can refer to it

The examples in this article describe PHP implements the session sharing function under load balancing. I share it with you for your reference. The details are as follows:

I have been busy developing the program for the fourth edition of Taiwan Sports Lottery recently, so I haven’t written anything for a long time. Today I just wrote something to share with you.

Let’s talk about load balancing first. I believe everyone knows that load balancing can solve the problem of large website traffic. Load balancing is to distribute user requests to polymorphic PCs for processing. Since the request is distributed, the session must be considered. Good solution. Traditionally, PHP will store the session in the local temporary file, but in this case, the session will be lost after distribution. In fact, the simplest solution is to use memcache to host it and set up a separate server. It is used as a memcache server (it is best to have a larger memory), and the next work can be left to the PHP code. I don’t want to modify php.ini here, because it would be too tiring to change it for each server, and I am more Lazy

Maybe you will tell me that just modify the session storage location of php.ini and you can write it to memcache. Yes, that’s right, but this method cannot call gc release. Drop the expired session, and what we want to say today is not only to let it be hosted, but also to let it automatically release the session.

Since we want to do it, we must do it perfectly. Below is my code , don’t know how to read the comments yourself:

$_ENV=array(
  'SYS'=>array(
    'Memip'=>'127.0.0.1',      //MEMCACHE的ip
    'Mempt'=>11211,       //MEMCACHE的port
    'Memtim'=>10,          //MEMCACHE的超時時間
  )
);
//托管SESSION到MEMCACHE,如果开启失败,则说明MEMCACHE没有配置正确
final class S{
  public static function open(){
  //禁止session自动开启
    session_write_close();
  ini_set('session.auto_start',0);
  //使用五十分之一的概率启动gc清理会话
  ini_set('session.gc_probability',1);
  ini_set('session.gc_pisor',50);
  ini_set('session.use_cookies',1);
  //session的寿命
  //ini_set('session.gc_maxlifetime',$_ENV['SYS']['Memtim']);
  //ini_set('session.cookie_lifetime',$_ENV['SYS']['Memtim']);
  //ini_set('session.save_handler','files');
  //ini_set('session.save_path',Run.'_tmp');
  //ini_set('session.save_handler','memcache');
  //ini_set('session.save_path','tcp://127.0.0.1:11211');
    //$_ENV['S_tim'] = ini_get('session.gc_maxlifetime');
  //建立memcache对象
  $_ENV['S_mem']=new Memcache;
  $_ENV['S_mem']->connect($_ENV['SYS']['Memip'],$_ENV['SYS']['Mempt']) or die('Memcache連接失敗!');
    return TRUE;
  }
  /**
    读取
    返回:读到的內容
  /**/
  public static function read($id){
    return $_ENV['S_mem']->get('s_'.$id);
  }
  /**
    写入
    返回:bool
  /**/
  public static function write($id,$data){
    return $_ENV['S_mem']->set('s_'.$id,$data,MEMCACHE_COMPRESSED,$_ENV['SYS']['Memtim']);
  }
  /**
    关闭
    返回:bool
  /**/
  public static function close(){
    $_ENV['S_mem']->close();
    unset($_ENV['S_mem'],$_ENV['SYS']['Memtim']);
    return TRUE;
  }
  /**
    刪除
    返回:bool
  /**/
  public static function destroy($id){
    return $_ENV['S_mem']->delete('s_'.$id);
  }
  /**
    清理
    返回:bool
  /**/
  public static function gc(){
    return TRUE;
  }
}
session_set_save_handler('S::open','S::close','S::read','S::write','S::destroy','S::gc');
$_ENV['sessionid']=(isset($_REQUEST['sessionid'])) ? trim($_REQUEST["sessionid"]) : session_id();
if($_ENV['sessionid']!=''){session_id($_ENV['sessionid']);}
session_start();

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