ws.onmessage我可以在js页面获取到设备的返回值，后台怎么获取返回值啊

Gateway::$registerAddress = '127.0.0.1:1238';
            $data = json_encode([
                'msgType'=>'registerPersonInfo',
                'msgID'=>'003',
                'deviceNo'=>$uid,
                'personInfoCount'=>'1',
            ]);
Gateway::sendToUid($uid, $data);

    ws = new WebSocket("ws://xxxxx:8282");
    ws.onopen = function() {
        console.log("连接成功");
    };

    ws.onmessage = function(e) {
        console.log(e.data);
    };