// 傳入ssl選項(xiàng)，包含證書的路徑
$context = array(
    'ssl' => array(
        'local_cert' => '/your/path/of/server.pem',
        'local_pk' => '/your/path/of/server.key',
        'verify_peer' => false,
    )
);
$io = new SocketIO(2021, $context);