PHP 可以异步使用套接字吗? [英] Can PHP asynchronously use sockets?

问题描述

典型的 PHP 套接字功能是同步的，并在等待传入连接和数据时暂停线程.(例如.socket_read 和 socket_listen)

Typical PHP socket functionality is synchronous, and halts the thread when waiting for incoming connections and data. (eg. socket_read and socket_listen)

我如何异步执行相同的操作?所以我可以在数据接收事件中响应数据，而不是轮询数据等.

How do I do the same asynchronously? so I can respond to data in a data received event, instead of polling for data, etc.

推荐答案

是的，这就是 socket_set_nonblock() 的用途.考虑到错误代码 11、EWOULDBLOCK 和 115、EINPROGRESS 所假定的特殊含义，您的套接字交互代码需要以不同方式编写.

Yup, that's what socket_set_nonblock() is for. Your socket interaction code will need to be written differently, taking into account the special meanings that error codes 11, EWOULDBLOCK, and 115, EINPROGRESS, assume.

以下是一些来自 PHP 同步套接字轮询循环的虚构示例代码，应要求提供:

Here's some somewhat-fictionalized sample code from a PHP sync socket polling loop, as requested:

$buf = '';
$done = false;
do {
    $chunk = socket_read($sock, 4096);
    if($chunk === false) {
        $error = socket_last_error($sock);
        if($error != 11 && $error != 115) {
            my_error_handler(socket_strerror($error), $error);
            $done = true;
        }
        break;
    } elseif($chunk == '') {
        $done = true;
        break;
    } else { 
        $buf .= $chunk;
    }
} while(true);

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