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一、我先升级了thinkphp6.0到最新版本：

composer update topthink/framework

二、结果提示我composer版本过低，需要升级到2，于是我又升级了composer

composer self-update

三、我又升级了workerman:

composer require topthink/think-worker

四、执行php think worker:gateway -d报错

  fclose(): Argument #1 ($stream) must be of type resource, null given  

五、在workerman论坛找到了答案，解决方案：https://www.workerman.net/q/6652

完美解决