workerman作为客户端怎么向另一个ws服务端发送emit指令
```php
use Workerman\Worker;
use Workerman\Connection\AsyncTcpConnectionworker = new Worker();
// 进程启动时
$worker->onWorkerStart = function()
{
// 以websocket协议连接远程websocket服务器ws_connection->onConnect = function($connection){
$connection->send('hello');
};
// 远程websocket服务器发来消息时function($connection, $data){
echo "recv: $data\n";
};
// 连接上发生错误时,一般是连接远程websocket服务器失败错误onError = function($connection, $code, $msg){
echo "error: $msg\n";
};
// 当连接远程websocket服务器的连接断开时