Yii框架中如何集成WebSocket

在Yii框架中集成WebSocket，你可以使用Ratchet庫。以下是集成WebSocket的步驟：

1. 安裝Ratchet庫

通過Composer安裝Ratchet庫。在你的項目根目錄下運行以下命令：

composer require cboden/ratchet

2. 創建WebSocket控制器

在controllers目錄下創建一個名為WebSocketController.php的文件，并添加以下內容：

<?php

namespace app\controllers;

use Ratchet\MessageComponentInterface;
use Ratchet\ConnectionInterface;
use Yii;

class WebSocketController extends \yii\web\Controller implements MessageComponentInterface {

    protected $clients;

    public function __construct() {
        $this->clients = new \SplObjectStorage;
    }

    public function onOpen(ConnectionInterface $conn) {
        $this->clients->attach($conn);
        echo "New connection! ({$conn->resourceId})\n";
    }

    public function onMessage(ConnectionInterface $from, $msg) {
        foreach ($this->clients as $client) {
            if ($from !== $client) {
                $client->send($msg);
            }
        }
    }

    public function onClose(ConnectionInterface $conn) {
        $this->clients->detach($conn);
        echo "Connection {$conn->resourceId} has disconnected\n";
    }

    public function onError(ConnectionInterface $conn, \Exception $e) {
        echo "An error has occurred: {$e->getMessage()}\n";
        $conn->close();
    }
}

3. 配置路由

在config/web.php文件中添加WebSocket路由：

<?php

$config = [
    // ...
    'components' => [
        // ...
        'urlManager' => [
            'enablePrettyUrl' => true,
            'showScriptName' => false,
            'rules' => [
                'ws' => 'websocket/index',
            ],
        ],
    ],
];

return $config;

4. 創建WebSocket入口文件

在web目錄下創建一個名為websocket的文件夾，并在其中創建一個名為index.php的文件，添加以下內容：

<?php

require dirname(__FILE__) . '/../vendor/autoload.php';

use Ratchet\Server\IoServer;
use Ratchet\Http\HttpServer;
use Ratchet\WebSocket\WsServer;
use app\controllers\WebSocketController;

$server = IoServer::factory(
    new HttpServer(
        new WsServer(
            new WebSocketController()
        )
    ),
    8080
);

$server->run();

現在，你已經成功在Yii框架中集成了WebSocket。你可以通過訪問ws://localhost:8080來測試WebSocket連接。