定期向 Ratchet 中的客户端发送消息

Question

我正在尝试定期向从 Ratchet 教程连接到聊天服务器的所有客户端发送"hello world！"消息

我将在这里发布所有代码：聊天.php：

<?php
namespace MyApp;
use RatchetMessageComponentInterface;
use RatchetConnectionInterface;
class Chat implements MessageComponentInterface {
    public $clients;
    public function __construct() {
        $this->clients = new SplObjectStorage;
            }
    public function onOpen(ConnectionInterface $conn) {
        // Store the new connection to send messages to later
        $this->clients->attach($conn);
        echo "New connection! ({$conn->resourceId})n";
    }
    //this worked but I don't want this behaviour
    public function onMessage(ConnectionInterface $from, $msg) {
        /*$numRecv = count($this->clients) - 1;
        echo sprintf('Connection %d sending message "%s" to %d other connection%s' . "n"
            , $from->resourceId, $msg, $numRecv, $numRecv == 1 ? '' : 's');
        foreach ($this->clients as $client) {
            if ($from !== $client) {
                // The sender is not the receiver, send to each client connected
                $client->send($msg);
            }
        }*/
    }
    public function onClose(ConnectionInterface $conn) {
        // The connection is closed, remove it, as we can no longer send it messages
        $this->clients->detach($conn);
        echo "Connection {$conn->resourceId} has disconnectedn";
    }
    public function onError(ConnectionInterface $conn, Exception $e) {
        echo "An error has occurred: {$e->getMessage()}n";
        $conn->close();
    }
}

聊天服务器.php：

<?php
use RatchetServerIoServer;
use MyAppChat;
    require dirname(__DIR__) . '/vendor/autoload.php';
    $server = IoServer::factory(
        new Chat(),
        8080
    );
    $server->run();

为了测试我理解了多少文档，我在服务器的循环中添加了一个计时器

    <?php
    use RatchetServerIoServer;
    use MyAppChat;
        require dirname(__DIR__) . '/vendor/autoload.php';
        $server = IoServer::factory(
            new Chat(),
            8080
        );

        // My code here
        $server->loop->addPeriodicTimer(5, function () {
          echo  "custom loop timer working !";        
        });

        $server->run();

启动服务器后每五秒输出一次该字符串可以正常工作。

现在我尝试这样做，尝试向存储在教程中名为聊天的消息组件接口中的客户端发送消息

$server->loop->addPeriodicTimer(5, function () {        
    foreach ($server->app->clients as $client) {                  
            $client->send("hello client");          
    }
});

但是我得到$server->应用程序是空的，这可能是因为我现在在函数（）块内。在面向对象的PHP方面，我不是专家，这个小项目肯定会对我有很大帮助。如何访问计时器内称为app服务器属性的MessageComponentInterface，然后将数据发送到存储在其中的客户端？

Answer 1

$server 未

在函数作用域中定义，默认情况下，父作用域中的变量不会继承到子作用域。闭包可以使用use语言构造从父作用域继承变量。

$server->loop->addPeriodicTimer(5, function () use ($server) {        
    foreach ($server->app->clients as $client) {                  
            $client->send("hello client");          
    }
});

有关匿名函数（闭包）的详细信息：https://secure.php.net/manual/en/functions.anonymous.php
有关变量范围的详细信息：https://secure.php.net/manual/en/language.variables.scope.php

Answer 2

经过一些更新后，可以在消息处理程序中访问客户端连接

    $port = 3001;
    $handler = new MessageHandler();

    $server = IoServer::factory(
        new HttpServer(
            new WsServer(
                handler 
            )
        ),
        $port
    );
    $server->loop->addPeriodicTimer(0.1, function () use ($handler) {
        handler->doStuff();
    });
    $server->run();

消息处理程序可以在这里找到。doStuff 方法应该在此类中实现：

https://github.com/leorojas22/symfony-websockets/blob/master/src/Websocket/MessageHandler.php