PHP 的 ZeroMQ XPub-XSub：消息永远不会到达代理

Question

我正在尝试使用带有 ZeroMQ 的代理和 PHP as it is described in the guide in Figure 13. The setup is the same as described here: how to implement Pub-Sub Network with a Proxy by using XPUB and XSUB in ZeroMQ(jzmq) 3.xx

来实现发布订阅

subscriber.php

<?php
$context = new ZMQContext();
$sub = new ZMQSocket($context, ZMQ::SOCKET_SUB);
$sub->connect("tcp://127.0.0.1:5000");
$sub->setSockOpt(ZMQ::SOCKOPT_SUBSCRIBE, 'Hello');
$msg = $sub->recv();
echo "got $msg";

publisher.php

<?php

$context = new ZMQContext();
$pub = new ZMQSocket($context, ZMQ::SOCKET_PUB);
$pub->connect("tcp://127.0.0.1:6000");

while (1) {
    echo "publishing";
    $pub->send("Hello World");
    sleep(1);
}

proxy.php

<?php
$context = new ZMQContext();
$frontend = new ZMQSocket($context, ZMQ::SOCKET_XSUB);
$frontend->bind("tcp://127.0.0.1:6000");
$backend = new ZMQSocket($context, ZMQ::SOCKET_XPUB);
$backend->bind("tcp://127.0.0.1:5000");
$device = new ZMQDevice($frontend, $backend);
$device->run();

如果我启动所有三个 PHP 脚本（首先是代理，然后是发布者，然后是订阅者），则没有消息到达该订阅者。

为了查看是否有任何消息到达代理，我尝试在代理上手动接收消息：

while (true) {
    if ($frontend->recv(ZMQ::MODE_DONTWAIT)) {
        echo "received message from xpub";
    }
    if ($frontend->recv(ZMQ::MODE_DONTWAIT)) {
        echo "received message from xsub";  
    }
}

Stack Overflow 上有几个相关问题：

How to implement Pub-Sub Network with a Proxy by using XPUB and XSUB in ZeroMQ(C++)? - 我正在使用答案中描述的代理，但我仍然没有收到任何消息。因此这个问题不适用
how to implement Pub-Sub Network with a Proxy by using XPUB and XSUB in ZeroMQ(jzmq) 3.xx回答的人说问题是发布者的消息没有转发给订阅者。但是，我根本没有收到发布者的任何消息。

我错过了什么？

Answer 1

[PROXY] 也需要设置主题过滤器：

$frontend->send( chr(1) + "" ); /* XSUBSCRIBE to { ANY == "" } topic incoming */

_{( For ZeroMQ API-Ref.: >>> ZeroMQ API documentation )}

PHP 的 ZeroMQ XPub-XSub：消息永远不会到达代理

ZeroMQ XPub-XSub with PHP: Messages never arrive at proxy

php

zeromq

publish-subscribe

[PROXY] 也需要设置主题过滤器：