$gateway->onConnect = function($connection)
{
    $connection->onWebSocketConnect = function($connection , $http_header)
    {
        // 可以在這里判斷連接來源是否合法，不合法就關(guān)掉連接
        // $_SERVER標(biāo)識(shí)來自哪個(gè)站點(diǎn)的頁(yè)面發(fā)起的websocket鏈接
        if($_SERVER != 'http://chat.workerman.net')
        {
            $connection->close();
        }
        // onWebSocketConnect 里面$_GET $_SERVER是可用的
        // var_dump($_GET, $_SERVER);
    };
};