我确定您已经解决了您的问题，但是对于即将来临的开发人员来说，这可能会有所帮助，它与您的作曲家有关 install kreait/firebase-php使用项目目录内 cmd 中的作曲家，您的问题将得到解决.

I am sure you already got your problem solved, but for upcoming developers it might be helpful, Its issue with your composer install kreait/firebase-php using composer in cmd inside project directory and your issue will be resolved.