php exec如何计算时间? [英] php exec how to calculate time?

问题描述

我正在尝试为我的任务在php中实现某种多重处理".任务是检查网络中每个设备的状态.

I'm trying to implement some kind of 'multiprocessing' in php for my task. The task is to check the status of every device in our network.

为此，我决定使用循环exec，它可以工作.但是我不知道它是否可以正常工作:

For that i decided to use looped exec and it works. But i don't know whether it works fine or not:

$command = "php scan_part.php $i > null &";
exec($command);

这会根据需要多次调用scan_part.php，但是问题是:我该如何计算执行所有scan_part.php所需的时间?

This calls scan_part.php as many times as i need, but the question is: how can i calculate time needed for all of my scan_part.php's to be executed?

请帮帮我，我被卡住了！

Please, help me, i'm stuck!

推荐答案

使用 proc_open 来启动脚本，而不是exec. Proc_open 可让您等到通过<一个href ="http://ca2.php.net/manual/fr/function.proc-close.php" rel ="nofollow"> proc_close ，它一直等到程序终止. /p>

Use proc_open to launch your script instead of exec. Proc_open lets you wait until a process is done through proc_close, which waits until the termination of the program.

$starttime = microtime(true);
$processes = array();
// stdin, stdout, stderr- take no input, save no output
$descriptors = array(
    0 => array("file", "/dev/null", 'r'),
    1 => array("file", "/dev/null", 'w'),
    2 => array("file", "/dev/null", 'w'));

while ($your_condition)
{
    $command = "php scan_part.php $i"; // no pipe redirection, no background mark
    $processes[] = proc_open($command, $descriptors, $pipes);
}

// proc_close will block until the program terminates or will return immediately
// if the program has already terminated
foreach ($processes as $process)
    proc_close($process);
$endtime = microtime(true);

$delta = $endtime - $starttime;

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