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## websocket server ```php $ws = new swoole_websocket_server('0.0.0.0', 9502); $ws->on('open', function ($ws, $request) { var_dump($request->fd, $request->get, $request->server); $ws->push($request->fd, "hello, welcome\n"); }); $ws->on('message', function ($ws, $frame) { echo "Message: {$frame->data}\n"; $ws->push($frame->fd, "server: {$frame->data}"); }); $ws->on('close', function ($ws, $fd) { echo "client-{$fd} is closed\n"; }); $ws->start();