如何在PHP中捕获捕获子进程输出 - How to capture capture child process output in PHP

How to capture capture child process output in PHP

本文关键字：输出子进程 PHP | 更新日期: 2024-03-11

我需要在PHP中捕获子进程的输出来操作它。

我有两个小脚本，parent.php和child.php

这是parent.php 的代码

    $exe = $_SERVER['_'];
    $command = '/var/www/child.php';
    echo "'nSTART'n";
    $pid = pcntl_fork();
    ob_start();
    echo "'nHELLO'n";
    if ($pid == -1)
        exit("Could not fork");
    else if ($pid)
        pcntl_waitpid($pid, $status);
    else
    {
        $args = array
        (
            "arg1" => 'one',
            "arg2" => 'two',
            "arg3" => 'three'
        );
        pcntl_exec($exe, array($command), $args);
    }
    $content = ob_get_contents();
    ob_end_clean();
    echo "'nEND'n";
    echo $content . "'n";

这是child.php 的代码

    echo "'n'tHELLO FROM TEST'n";
    echo "'t"; var_dump($_SERVER['arg1']);
    echo "'t"; var_dump($_SERVER['arg2']);
    echo "'t"; var_dump($_SERVER['arg3']);

现在。。。这是我的输出：

START
    HELLO FROM TEST
    string(3) "one"
    string(3) "two"
    string(5) "three"
END
HELLO

但我需要THIS输出

START
END
HELLO
    HELLO FROM TEST
    string(3) "one"
    string(3) "two"
    string(5) "three"

ob_start()的经典缓冲区解决方案可能不起作用吗？？

注意：输出顺序并不重要，我需要捕获它用于操作目的

我找到了解决方案。

您必须使用proc_open（）函数，该函数允许您直接使用流缓冲区：

echo "'nSTART'n";
$stream = null;
$descriptorspec = array(
   0 => array("pipe", "r"),
   1 => array("pipe", "w"),
   2 => array("file", "/tmp/error-output.txt", "a")
);
$cwd = '/tmp';
$env = array('some_option' => 'aeiou');
$process = proc_open('/usr/bin/php', $descriptorspec, $pipes, $cwd, $env);
if (is_resource($process))
{
    fwrite($pipes[0], '<?php echo "HELLO FROM TEST"; ?>'); // here directly the code of child.php
    fclose($pipes[0]);
    $stream = stream_get_contents($pipes[1]);
    fclose($pipes[1]);
    proc_close($process);
}
echo "'nEND'n";
echo "'n$stream'n";

输出为：

START
END
HELLO FROM TEST