将php exec存储在会话变量中 [英] Store php exec in a session variable

问题描述

$ p
$ b

例如：

index.php

<？php exec ，$ arrat，$ _SESSION ['output']）; ？>

follow.php

 < php echo $ _SESSION ['output']）; ？> 
  

所以，当我运行index.php时，我可以关闭页面，导航到follow.php，

解决方案

不，因为 exec 等待生成的进程在返回之前终止。但应该可以使用 proc_open ，因为该函数将生成的进程的输出作为流提供，不等待它终止。因此，在布朗条件下，您可以这样做：

1. 使用 proc_open 并将其输出重定向到管道。


2. 使用 stream_select 在某种循环中查看是否有输出要读;


3. 每当读取输出时，调用 session_start ，将其写入会话变量，调用 session_write_close 。这是标准的会话锁舞蹈，允许您的脚本更新会话数据，而无需在整个时间内对其进行锁定。

Is is possible to store an exec' output into a session variable while its running to see it's current progress?

example:

index.php

<?php exec ("very large command to execute", $arrat, $_SESSION['output']); ?>

follow.php

<php echo $_SESSION['output']); ?>

So, when i run index.php i could close the page and navigate to follow.php and follow the output of the command live everytime i refresh the page.

解决方案

No, because exec waits for the spawned process to terminate before it returns. But it should be possible to do with proc_open because that function provides the outputs of the spawned process as streams and does not wait for it to terminate. So in broard terms you could do this:

1. Use proc_open to spawn a process and redirect its output to pipes.
2. Use stream_select inside some kind of loop to see if there is output to read; read it with the appropriate stream functions when there is.
3. Whenever output is read, call session_start, write it to a session variable and call session_write_close. This is the standard "session lock dance" that allows your script to update session data without holding a lock on them the whole time.

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