php通过nodejs（socket.io）和redis向特定用户发送通知

Question

我尝试使用nodejs和redis将通知推送到特定客户端，但向请求的用户发出通知无法正常工作

我在php和nodejs和客户端的代码如下：

//Nodejs Server ---------------------------
var io = require('socket.io').listen(3000);
var redis = require('redis');
var $clients = {};

var $notifySubscribe = redis.createClient();
var $loginUserSubscribe = redis.createClient();
$notifySubscribe.subscribe('notify');
$loginUserSubscribe.subscribe('loginUser');

$notifySubscribe.on('message', function($channel, $message) {
    var $data = JSON.parse($message);
    if($data.userId in $clients){
        $clients[$data.userId].emit('updateNotifications', '+1');
    }
});

io.sockets.on('connection', function(socket) {

    $loginUserSubscribe.on('message', function($channel, $message){
        var $data = JSON.parse($message);
        if(!($data.userId in $clients)){
            $clients[$data.userId] = socket;
        }
    });

});

//Client ----------------------------------
socketIo.on('updateNotifications', function($count){
    alert($count);
});

//Php Server ------------------------------
$data = array('userId' => 20584, 'username' => 'mohammadsaleh');
$this->__redis->publish("notify", json_encode($data));