redis发布一次 订阅却收到4次是什么情况

    $worker = new Worker();
    $worker->name = 'redis';
    $worker->count = 1;
     $worker->pingInterval = 30;
    $worker->onWorkerStart = function(){
    $redis = new Client('redis://xxxxxxxxx:6379');
    $redis->auth('xxxxx');
    $redis->subscribe(['ready], function ($channel, $message) {
    })