在PHP CLI中对STDIN进行非阻塞

问题描述

无论如何，都可以使用非阻塞的PHP从STDIN进行读取:

Is there anyway to read from STDIN with PHP that is non blocking:

我尝试过:

stream_set_blocking(STDIN, false);
echo fread(STDIN, 1);

和这个:

$stdin = fopen('php://stdin', 'r');
stream_set_blocking($stdin, false);
echo 'Press enter to force run command...' . PHP_EOL;
echo fread($stdin, 1);

，但是它仍然会阻塞，直到fread获得一些数据为止.

but it still blocks until fread gets some data.

我注意到了一些有关此问题的公开错误报告(已有7年之久了)，因此，如果无法做到这一点，是否有人知道(在Windows和Linux上)能做到这一点的粗暴黑客?

I noticed a few open bug reports about this (7 years old), so if it can't be done, does any one know any crude hacks that could accomplish this (on Windows and Linux)?

• https://bugs.php.net/bug.php?id=34972
• https://bugs.php.net/bug.php?id=47893
• https://bugs.php.net/bug.php?id=48684

• https://bugs.php.net/bug.php?id=34972
• https://bugs.php.net/bug.php?id=47893
• https://bugs.php.net/bug.php?id=48684

推荐答案

这就是我能想到的.它在Linux上可以正常工作，但是在Windows上，只要我按下一个键，输入就会被缓冲，直到按下Enter.我不知道一种禁用流缓冲的方法.

Here's what I could come up with. It works fine in Linux, but on Windows, as soon as I hit a key, the input is buffered until enter is pressed. I don't know a way to disable buffering on a stream.

<?php

function non_block_read($fd, &$data) {
    $read = array($fd);
    $write = array();
    $except = array();
    $result = stream_select($read, $write, $except, 0);
    if($result === false) throw new Exception('stream_select failed');
    if($result === 0) return false;
    $data = stream_get_line($fd, 1);
    return true;
}

while(1) {
    $x = "";
    if(non_block_read(STDIN, $x)) {
        echo "Input: " . $x . "\n";
        // handle your input here
    } else {
        echo ".";
        // perform your processing here
    }
}

?>

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