Detailed explanation of session sharing cases under load balancing in PHP (with code)-PHP Tutorial-php.cn

Detailed explanation of session sharing cases under load balancing in PHP (with code)

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Release： 2023-03-26 06:46:01

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This time I will bring you a detailed explanation of session sharing cases under PHP load balancing (with code). What are the precautions for PHP to realize session sharing under load balancing? , the following is a practical case, let’s take a look.

First let’s talk about load balancing. I believe everyone knows that load balancing can effectively solve the problem of large website traffic. Load balancing is to distribute user requests to polymorphic PCs for processing. Since the requests are distributed, then You must consider how to handle the session. Traditionally, PHP will store the session in the local temporary file. However, in this case, the session will be lost after distribution. In fact, the simplest solution is to use memcache to host it separately. Set up a server as a memcache server (it is best to have a larger memory), and leave the next work to PHP code. I don’t want to modify php.ini here, because each It would be too tiring to change them all, and I am lazy. Maybe you will tell me that I can write to memcache by directly modifying the session storage location of

php.ini

. Yes, that’s right. , but this method cannot call gc to release 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 have to do it, we have to do it It has to be perfect. Below is my code. If you don’t know how to read the comments yourself:

$_ENV=array(
  &#39;SYS&#39;=>array(
    &#39;Memip&#39;=>&#39;127.0.0.1&#39;,      //MEMCACHE的ip
    &#39;Mempt&#39;=>11211,       //MEMCACHE的port
    &#39;Memtim&#39;=>10,          //MEMCACHE的超時時間
  )
);
//托管SESSION到MEMCACHE,如果开启失败,则说明MEMCACHE没有配置正确
final class S{
  public static function open(){
  //禁止session自动开启
    session_write_close();
  ini_set(&#39;session.auto_start&#39;,0);
  //使用五十分之一的概率启动gc清理会话
  ini_set(&#39;session.gc_probability&#39;,1);
  ini_set(&#39;session.gc_pisor&#39;,50);
  ini_set(&#39;session.use_cookies&#39;,1);
  //session的寿命
  //ini_set(&#39;session.gc_maxlifetime&#39;,$_ENV[&#39;SYS&#39;][&#39;Memtim&#39;]);
  //ini_set(&#39;session.cookie_lifetime&#39;,$_ENV[&#39;SYS&#39;][&#39;Memtim&#39;]);
  //ini_set(&#39;session.save_handler&#39;,&#39;files&#39;);
  //ini_set(&#39;session.save_path&#39;,Run.&#39;_tmp&#39;);
  //ini_set(&#39;session.save_handler&#39;,&#39;memcache&#39;);
  //ini_set(&#39;session.save_path&#39;,&#39;tcp://127.0.0.1:11211&#39;);
    //$_ENV[&#39;S_tim&#39;] = ini_get(&#39;session.gc_maxlifetime&#39;);
  //建立memcache对象
  $_ENV[&#39;S_mem&#39;]=new Memcache;
  $_ENV[&#39;S_mem&#39;]->connect($_ENV[&#39;SYS&#39;][&#39;Memip&#39;],$_ENV[&#39;SYS&#39;][&#39;Mempt&#39;]) or die(&#39;Memcache連接失敗!&#39;);
    return TRUE;
  }
  /**
    读取
    返回:读到的內容
  /**/
  public static function read($id){
    return $_ENV[&#39;S_mem&#39;]->get(&#39;s_&#39;.$id);
  }
  /**
    写入
    返回:bool
  /**/
  public static function write($id,$data){
    return $_ENV[&#39;S_mem&#39;]->set(&#39;s_&#39;.$id,$data,MEMCACHE_COMPRESSED,$_ENV[&#39;SYS&#39;][&#39;Memtim&#39;]);
  }
  /**
    关闭
    返回:bool
  /**/
  public static function close(){
    $_ENV[&#39;S_mem&#39;]->close();
    unset($_ENV[&#39;S_mem&#39;],$_ENV[&#39;SYS&#39;][&#39;Memtim&#39;]);
    return TRUE;
  }
  /**
    刪除
    返回:bool
  /**/
  public static function destroy($id){
    return $_ENV[&#39;S_mem&#39;]->delete(&#39;s_&#39;.$id);
  }
  /**
    清理
    返回:bool
  /**/
  public static function gc(){
    return TRUE;
  }
}
session_set_save_handler(&#39;S::open&#39;,&#39;S::close&#39;,&#39;S::read&#39;,&#39;S::write&#39;,&#39;S::destroy&#39;,&#39;S::gc&#39;);
$_ENV[&#39;sessionid&#39;]=(isset($_REQUEST[&#39;sessionid&#39;])) ? trim($_REQUEST["sessionid"]) : session_id();
if($_ENV[&#39;sessionid&#39;]!=&#39;&#39;){session_id($_ENV[&#39;sessionid&#39;]);}
session_start();

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I believe you have mastered the method after reading the case in this article. For more exciting information, please pay attention to other related articles on the PHP Chinese website!