php执行后台进程 [英] php execute a background process

问题描述

我需要在执行用户操作时执行目录复制，但是目录很大，因此我希望能够执行这样的操作，而用户却不知道完成复制所花费的时间.

I need to execute a directory copy upon a user action, but the directories are quite large, so I would like to be able to perform such an action without the user being aware of the time it takes for the copy to complete.

任何建议将不胜感激.

推荐答案

假设此程序在Linux机器上运行，我总是这样处理:

Assuming this is running on a Linux machine, I've always handled it like this:

exec(sprintf("%s > %s 2>&1 & echo $! >> %s", $cmd, $outputfile, $pidfile));

这将启动命令$cmd，将命令输出重定向到$outputfile，并将进程ID写入$pidfile.

This launches the command $cmd, redirects the command output to $outputfile, and writes the process id to $pidfile.

这使您可以轻松地监视该进程在做什么以及它是否仍在运行.

That lets you easily monitor what the process is doing and if it's still running.

function isRunning($pid){
    try{
        $result = shell_exec(sprintf("ps %d", $pid));
        if( count(preg_split("/\n/", $result)) > 2){
            return true;
        }
    }catch(Exception $e){}

    return false;
}

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