从 PHP 写入标准输入？
在 Linux 中，我想从 PHP 运行 gnome zenity 进度条窗口。 zenity 的工作原理如下：
linux-shell$ zenity --display 0:1 --progress --text='Backing up' --percentage=0
10
50
100
因此第一个命令将 zenity 进度条打开为 0%。然后 Zenity 将标准输入数字作为进度条百分比（因此当您输入这些数字时，进度条将从 10% 变为 50% 再到 100%）。
我不知道如何让 PHP 输入这些数字，但我已经尝试过：
exec($cmd);
echo 10;
echo 50;
和：
$handle = popen( $cmd, 'w' );
fwrite( $handle, 10 );
和：
$descriptorspec = array(
0 => array("pipe", "r"), // stdin is a pipe that the child will read from
1 => array("pipe", "w") // stdout is a pipe that the child will write to
);
$h = proc_open($cmd, $descriptorspec, $pipes);
fwrite($pipes[1], 10);
但它们都没有更新进度条。我可以通过什么方式模仿 Linux shell 上 stdin 的效果来让 zenity 更新其进度条？
In linux I want to run a gnome zenity progress bar window from PHP. How zenity works is like this:
linux-shell$ zenity --display 0:1 --progress --text='Backing up' --percentage=0
10
50
100
So the first command opens the zenity progress bar at 0 percent. Zenity then takes standard input numbers as the progress bar percentage (so it will go from 10% to 50% to 100% when you type those numbers in).
I can't figure out how to get PHP to type in those numbers though, I have tried:
exec($cmd);
echo 10;
echo 50;
And:
$handle = popen( $cmd, 'w' );
fwrite( $handle, 10 );
And:
$descriptorspec = array(
0 => array("pipe", "r"), // stdin is a pipe that the child will read from
1 => array("pipe", "w") // stdout is a pipe that the child will write to
);
$h = proc_open($cmd, $descriptorspec, $pipes);
fwrite($pipes[1], 10);
But none of them updates the progress bar. In what way can I mimic the effect of the stdin on the linux shell to get zenity to update its progress bar?
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评论（1）
您首先使用当前脚本的标准输入副本（而不是您提供的文本）执行命令。
你的第二个失败是因为你忘记了换行符。尝试使用
fwrite($handle, "10\n")代替。请注意，当达到 EOF 时，zenity 似乎会跳到 100%（例如，通过在 PHP 脚本末尾隐式关闭$handle）。第三次失败是因为您忘记了换行符并且写入了错误的管道。尝试使用
fwrite($pipes[0], "10\n")代替，并记住与上面有关 EOF 的相同注释。Your first executes the command with a copy of the current script's stdin, not the text you provide.
Your second fails because you are forgetting the newline. Try
fwrite($handle, "10\n")instead. Note that zenity seems to jump to 100% when EOF is reached (e.g. by the implicit close of$handleat the end of your PHP script).Your third fails because you are forgetting the newline and you are writing to the wrong pipe. Try
fwrite($pipes[0], "10\n")instead, and remember the same note regarding EOF as above.