PHP阅读shell_exec实时输出 [英] PHP reading shell_exec live output

问题描述

我只是在Linux服务器上试验PHP和shell_exec.这是一个非常酷的功能，到目前为止，我真的很喜欢它.有没有一种方法可以查看命令运行时正在进行的实时输出?

I'm just experimenting with PHP and shell_exec on my Linux server. It's a really cool function to use and I am really enjoying it so far. Is there a way to view the live output that is going on while the command is running?

例如，如果运行ping stackoverflow.com，同时对目标地址执行ping操作，则每次ping操作时，都使用PHP显示结果吗?有可能吗?

For example, if ping stackoverflow.com was run, while it is pinging the target address, every time it pings, show the results with PHP? Is that possible?

我希望看到缓冲区正在运行时进行实时更新.也许不可能，但肯定会很好.

I would love to see the live update of the buffer as it's running. Maybe it's not possible but it sure would be nice.

这是我正在尝试的代码，我尝试过的所有方式都始终在命令完成后显示结果.

This is the code I am trying and every way I have tried it always displays the results after the command is finished.

<?php

  $cmd = 'ping -c 10 127.0.0.1';

  $output = shell_exec($cmd);

  echo "<pre>$output</pre>";

?>

我尝试将echo部分放入循环中，但还是没有运气.有没有人建议将其显示在屏幕上，而不是等到命令完成后再显示?

I've tried putting the echo part in a loop but still no luck. Anyone have any suggestions on making it show the live output to the screen instead of waiting until the command is complete?

我尝试了exec，shell_exec，system和passthru.完成后，每个人都会显示内容.除非我使用了错误的语法或没有正确设置循环.

I've tried exec, shell_exec, system, and passthru. Everyone of them displays the content after it's finished. Unless I'm using the wrong syntax or I'm not setting up the loop correctly.

推荐答案

要读取进程的输出，可以使用popen().您的脚本将与程序并行运行，并且可以通过读取和写入脚本的输出/输入来与脚本进行交互，就像文件一样.

To read the output of a process, popen() is the way to go. Your script will run in parallel with the program and you can interact with it by reading and writing it's output/input as if it was a file.

但是，如果您只想转储结果，直接将其发送给用户，则您可以切入正题并使用passthru():

But if you just want to dump it's result straight to the user you can cut to the chase and use passthru():

echo '<pre>';
passthru($cmd);
echo '</pre>';

如果要在程序运行时在运行时显示输出，可以执行以下操作:

If you want to display the output at run time as the program goes, you can do this:

while (@ ob_end_flush()); // end all output buffers if any

$proc = popen($cmd, 'r');
echo '<pre>';
while (!feof($proc))
{
    echo fread($proc, 4096);
    @ flush();
}
echo '</pre>';

此代码应运行命令，并在运行时将输出直接推送给最终用户.

This code should run the command and push the output straight to the end user at run time.

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