Exec()之后的PHP StdErr [英] PHP StdErr after Exec()

问题描述

在PHP中，我正在使用exec()执行命令，如果成功则返回URL；

In PHP I am executing a command with exec(), and it returns if successful an URL;

$url = exec('report');

但是，如果出现问题，我想检查stderr.我将如何阅读信息流? 我想使用php://stderr，但是我不确定如何使用它.

However, I want to check stderr, if something went wrong. How would I read the stream? I want to use php://stderr, but I am not sure how to use it.

推荐答案

如果要执行命令，并同时获取stderr和stdout，而不是合并"，则解决方案可能使用 proc_open ，它可以很好地控制正在执行的命令- -包括管道stdin/stdout/stderr的方法.

If you want to execute a command, and get both stderr and stdout, not "merged", a solution would probably to use proc_open, which provides a great level of control over the command that's being executed -- including a way to pipe stdin/stdout/stderr.

这是一个示例:让我们考虑在test.sh中有这个shell脚本，它同时写入stderr和stdout:

And here is an example : let's consider we have this shell-script, in test.sh, which writes to both stderr and stdout :

#!/bin/bash

echo 'this is on stdout';
echo 'this is on stdout too';

echo 'this is on stderr' >&2;
echo 'this is on stderr too' >&2;

现在，让我们在temp.php中编写一些PHP的代码-首先，我们初始化i/o描述符:

Now, let's code some PHP, in temp.php -- first, we initialize the i/o descriptors :

$descriptorspec = array(
   0 => array("pipe", "r"),  // stdin
   1 => array("pipe", "w"),  // stdout
   2 => array("pipe", "w"),  // stderr
);

然后，使用这些描述符在当前目录中执行test.sh命令，并说输入/输出应该为/c至$pipes:

And, then, execute the test.sh command, using those descriptors, in the current directory, and saying the i/o should be from/to $pipes :

$process = proc_open('./test.sh', $descriptorspec, $pipes, dirname(__FILE__), null);

我们现在可以从两个输出管道中读取内容:

We can now read from the two output pipes :

$stdout = stream_get_contents($pipes[1]);
fclose($pipes[1]);

$stderr = stream_get_contents($pipes[2]);
fclose($pipes[2]);

并且，如果我们输出这两个变量的内容:

And, if we output the content of those two variables :

echo "stdout : \n";
var_dump($stdout);

echo "stderr :\n";
var_dump($stderr);

执行temp.php脚本时，我们得到以下输出:

We get the following output when executing the temp.php script :

$ php ./temp.php
stdout :
string(40) "this is on stdout
this is on stdout too
"
stderr :
string(40) "this is on stderr
this is on stderr too
"

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