在子进程的回调里使用empty 或者isset 导致进程卡死

$worker->onMessage = function ($connection, $data) {
    try {
        $ret = call_user_func_array(array(SERVICE_DIR."\\".$class, $method), $param_array);
 /*这里我只要判断比如 isset($ret);进程机会卡死。走不到 下面如果我不判断直接返回的就可以。
我本地可以，本地的版本是php7.0 服务器上不行。版本是php7.15。其实这个时候返回的数据$ret 是个空数组
，*/

    StatisticClient::report($class, $method, 1, 0, '', $statistic_address);
   return $connection->send($ret);
   }
    catch (Exception $e) {
        // 发送数据给客户端，发生异常，调用失败
    $code = $e->getCode() ? $e->getCode() : 500;
        StatisticClient::report($class, $method, $success, $code, $e, $statistic_address);
        return $connection->send(array('code' => $code, 'msg' => $e->getMessage(), 'data' => $e));
    }
}

strce 打出来的信息里。比较有用的是

poll(, 1, 0) = 0 (Timeout)
sendto(23, "*3\r\n$3\r\nSET\r\n$61\r\nhooker_config_"..., 89, MSG_DONTWAIT, NULL, 0) = 89
poll(, 1, 0) = 0 (Timeout)
poll(, 1, 3000) = 1 ()
recvfrom(23, "+OK\r\n", 8192, MSG_DONTWAIT, NULL, NULL) = 5
poll(, 1, 0) = 0 (Timeout)
sendto(23, "*4\r\n$4\r\nHSET\r\n$56\r\nhooker_config"..., 121, MSG_DONTWAIT, NULL, 0) = 121
poll(, 1, 0) = 0 (Timeout)
poll(, 1, 3000) = 1 ()
recvfrom(23, ":0\r\n", 8192, MSG_DONTWAIT, NULL, NULL) = 4