PHP会话未更新(PHP Session not updated)

PHP会话未更新(PHP Session not updated)

我在php / ajax中建立聊天。 为了检测用户超时，我编写了一个后台PHP脚本，如果5秒内没有活动，则断开用户连接。

问题是，会话中的变量没有更新......

这是我的chat.php，其中执行了所有ajax查询（每个客户端至少每秒1次）：

<?php session_save_path("sessions"); session_start(); $_SESSION['last_request'] = time();

以下是我从这个chat.php启动后台脚本的方法：

exec('php user_manager.php ' . session_id() . ' > /tmp/output &');

这是我的循环来检查用户是否仍在这里（这是后台进程）：

<?php session_save_path("sessions"); session_id($argv[1]); session_start(); ignore_user_abort(true); set_time_limit(0); echo "background task starting on user " . $_SESSION['user'] . PHP_EOL; $lastrequest = $_SESSION["last_request"]; while(time() - intval($lastrequest) < 5) { //5 seconds echo "last_request : " . $lastrequest . PHP_EOL; $lastrequest = $_SESSION["last_request"]; sleep(1); } echo "disconnecting user !" . PHP_EOL;

正如您所看到的，last_request会话变量永远不会更新：

# cat /tmp/output background task starting on user test last_request : 1493120020 last_request : 1493120020 last_request : 1493120020 last_request : 1493120020 last_request : 1493120020 disconnecting user !

我不明白为什么，它让我发疯...请帮忙！

I'm building a chat in php/ajax. In order to detect users timeout, I wrote a background php script which disconnects the user if there is no activity for 5 seconds.

The problem is, the variable in the sessions are not updated...

Here is my chat.php where all the ajax queries are performed (at least 1 per second and per client) :

<?php session_save_path("sessions"); session_start(); $_SESSION['last_request'] = time();

Here is how I launch the background script from this chat.php :

exec('php user_manager.php ' . session_id() . ' > /tmp/output &');

And here is my loop to check if the user is still here (this is the background process) :

<?php session_save_path("sessions"); session_id($argv[1]); session_start(); ignore_user_abort(true); set_time_limit(0); echo "background task starting on user " . $_SESSION['user'] . PHP_EOL; $lastrequest = $_SESSION["last_request"]; while(time() - intval($lastrequest) < 5) { //5 seconds echo "last_request : " . $lastrequest . PHP_EOL; $lastrequest = $_SESSION["last_request"]; sleep(1); } echo "disconnecting user !" . PHP_EOL;

And as you can see, the last_request session variable is never updated :

# cat /tmp/output background task starting on user test last_request : 1493120020 last_request : 1493120020 last_request : 1493120020 last_request : 1493120020 last_request : 1493120020 disconnecting user !

I don't understand why and it's driving me crazy... Please help !

最满意答案

$ _SESSION数组在session_start处启动，但在用户聊天脚本不会修改之后。 您应该在每个会话中使用一个文件，其中chat.php写入上次访问时间。 后台进程必须在while块中读取此文件。

聊天脚本：

<?php session_save_path("sessions"); session_start(); file_put_contents('access_' . session_id() . '.txt', time());

后台流程：

<?php session_save_path("sessions"); session_id($argv[1]); session_start(); ignore_user_abort(true); set_time_limit(0); echo "background task starting on user " . $_SESSION['user'] . PHP_EOL; $lastrequest = file_get_contents('access_' . session_id() . '.txt'); while(time() - intval($lastrequest) < 5) { //5 seconds echo "last_request : " . $lastrequest . PHP_EOL; $lastrequest = file_get_contents('access_' . session_id() . '.txt'); sleep(1); } echo "disconnecting user !" . PHP_EOL;

The $_SESSION array is initiated at the session_start, but after it won't be modified by the user chat script. You should use a file per session where the chat.php write the last access time. The background process have to read this file in the while block.

Chat script:

<?php session_save_path("sessions"); session_start(); file_put_contents('access_' . session_id() . '.txt', time());

Background process:

<?php session_save_path("sessions"); session_id($argv[1]); session_start(); ignore_user_abort(true); set_time_limit(0); echo "background task starting on user " . $_SESSION['user'] . PHP_EOL; $lastrequest = file_get_contents('access_' . session_id() . '.txt'); while(time() - intval($lastrequest) < 5) { //5 seconds echo "last_request : " . $lastrequest . PHP_EOL; $lastrequest = file_get_contents('access_' . session_id() . '.txt'); sleep(1); } echo "disconnecting user !" . PHP_EOL;