$worker = new Worker('websocket://0.0.0.0:2000'); 
$worker->count = 2; 
$AllConnections = array();//記錄所有連接，鍵名為uid

$worker->onConnect = function($connection)

            global $worker,$AllConnections;
            $AllConnections = $connection;//所有連接都保存到這個變量里，用這個變量實現(xiàn)群推送
        };