php 棘轮 websocket SSL connect？

我有一个棘轮聊天服务器文件

use Ratchet\Server\IoServer;
use Ratchet\WebSocket\WsServer;
use MyAppChat\Chat;
require dirname(__DIR__) . '/vendor/autoload.php';
$server = IoServer::factory(
    new WsServer(
        new Chat()
    )
  , 26666
);
$server->run();

我使用Websocket进行连接，它工作正常ws

if ("WebSocket" in window) {
    var ws = new WebSocket("ws://ratchet.mydomain.org:8888");
    ws.onopen = function() {
        // Web Socket is connected. You can send data by send() method.
        ws.send("message to send");
    };
    ws.onmessage = function (evt) { 
        var received_msg = evt.data;
    };
    ws.onclose = function() { 
        // websocket is closed. 
    };
} else {
  // the browser doesn't support WebSocket.
}

我想要安全连接，所以我尝试使用SSL连接，但无法正常工作。

if ("WebSocket" in window) {
    var ws = new WebSocket("wss://ratchet.mydomain.org:8888");
    ws.onopen = function() {
        // Web Socket is connected. You can send data by send() method.
        ws.send("message to send");
    };
    ws.onmessage = function (evt) { 
        var received_msg = evt.data;
    };
    ws.onclose = function() { 
        // websocket is closed. 
    };
} else {
  // the browser doesn't support WebSocket.
}

我的问题是如何将websocket与SSL连接

有什么想法吗？