我明白了：
Problem 1
- doctrine/mongodb dev-master requires ext-mongo * -> no matching package found.
- doctrine/doctrine-mongo-odm-module dev-master requires doctrine/mongodb-odm dev-master -> satisfiable by doctrine/mongodb-odm dev-master.
- doctrine/mongodb-odm dev-master requires doctrine/mongodb dev-master -> satisfiable by doctrine/mongodb dev-master.
- Installation request for doctrine/doctrine-mongo-odm-module dev-master -> satisfiable by doctrine/doctrine-mongo-odm-module dev-master.
我有mongo，它是我的Mac上安装的php扩展程序，但仍然没有乐趣。有什么想法吗？