如何从 SESSID 获取 $_SESSION 数据? [英] How can I get $_SESSION data from SESSID?
问题描述
我有一个 PHP websocket 服务器 (https://github.com/lemmingzshadow/php-websocket/).
I have a PHP websocket server (https://github.com/lemmingzshadow/php-websocket/).
当用户连接时，我想设置/获取一些会话数据.
When an user connects, I want to set/get some session data.
问题是我不能使用 $_SESSION 因为如果我这样做，我会得到我的 websocket 服务器的会话而不是客户端的会话.
The problem is that I can't use $_SESSION because if I do that, instead of clients' session I get the session of my websocket server.
我已设法获得客户的 SESSID:
I have managed to get clients' SESSID:
private function handshake($data) {
$this->log('Performing handshake');
if(preg_match("/PHPSESSID=(.*?)(?:;|\r\n)/", $data, $matches)){
$sessid = $matches[1];
}
/* Do handshake */
}
但现在我不知道如何获取与该 SESSID 相关的会话数据.
But now I don't know how to get the session data related to that SESSID.
推荐答案
看来我已经解决了(但我还要多测试):
It seems I have solved it (but I have to test it more):
private function handshake($data) {
$this->log('Performing handshake');
if(preg_match("/PHPSESSID=(.*?)(?:;|\r\n)/", $data, $matches)){
$this->sessID = $matches[1];
session_id($this->sessID);
@session_start();
if(isset($_SESSION['userName'])){
$this->userName = $_SESSION['userName'];
}else{
$_SESSION['userName'] = $this->userName;
}
session_write_close();
}else{
$this->log('No SESSID');
return false;
}
/* Do handshake */
}
并在我的客户端页面 index.php 上启用会话 cookie
And to enable session cookies, on my client page index.php
<?php
session_start();
?>
<!DOCTYPE html>
<!-- Page's HTML -->
说明
首先，我使用 session_id 以便以下 session_start() 会给我相关的会话给定的 SESSID.
First, I use session_id so that the following session_start() will give me the session related to the given SESSID.
然后，我可以使用 @session_start() 开始会话.它需要 @ 因为 websocket 服务器已经启动，所以不需要使用它产生:
Then, I can use @session_start() to start the session. It needs @ because the websocket server has already started, so not using it produces:
- PHP 警告:session_start():无法发送会话 cookie - 标头已发送
- PHP 警告:session_start():无法发送会话缓存限制器 - 标头已发送
现在我可以用 $_SESSION 做我想做的事.
Now I can do what I want with $_SESSION.
最后，我使用 session_write_close() 以关闭会话.必须使用它，因为:
Finally, I use session_write_close() in order to close the session. It must be used because:
session_id必须先调用session_start().如果会话没有关闭，当第二个客户端连接时，会话将已经打开，所以session_id不起作用.
为了避免会话锁定.正如@Sven 所说，只能有一个 PHP 实例可以访问会话文件.由于websocket服务器的脚本要运行很长时间，一旦打开一个session，不关闭就不能在其他脚本中使用session.
To avoid session locking. As @Sven said, there can only be one instance of PHP running that has access to the session file. Since the websocket server's script should be running for a long time, once it opens a session, you can't use session in other scripts if you don't close it.
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