Php Mongodb odm编写器请求

我无法通过以下命令为mongodb odm请求编写器：

编写器请求原则/mongodb odm

。每次运行此命令时，我都会收到一条错误消息，上面说：

Your requirements could not be resolved to an installable set of packages.

  Problem 1
    - doctrine/mongodb-odm 1.0.0 requires doctrine/mongodb ~1.2 -> satisfiable by doctrine/mongodb[1.2.0, 1.2.1].
    - doctrine/mongodb-odm 1.0.1 requires doctrine/mongodb ~1.2 -> satisfiable by doctrine/mongodb[1.2.0, 1.2.1].
    - doctrine/mongodb-odm 1.0.2 requires doctrine/mongodb ~1.2 -> satisfiable by doctrine/mongodb[1.2.0, 1.2.1].
    - doctrine/mongodb-odm 1.0.3 requires doctrine/mongodb ~1.2 -> satisfiable by doctrine/mongodb[1.2.0, 1.2.1].
    - doctrine/mongodb-odm 1.0.4 requires doctrine/mongodb ~1.2 -> satisfiable by doctrine/mongodb[1.2.0, 1.2.1].
    - doctrine/mongodb 1.2.1 requires ext-mongo ^1.2.12 -> the requested PHP extension mongo is missing from your system.
    - doctrine/mongodb 1.2.0 requires ext-mongo ^1.2.12 -> the requested PHP extension mongo is missing from your system.
    - Installation request for doctrine/mongodb-odm ^1.0 -> satisfiable by doctrine/mongodb-odm[1.0.0, 1.0.1, 1.0.2, 1.0.3, 1.0.4].

  To enable extensions, verify that they are enabled in those .ini files:
    - /etc/php.ini
  You can also run `php --ini` inside terminal to see which files are used by PHP in CLI mode.

Installation failed, reverting ./composer.json to its original content.

现在，我的问题是，即使我的配置看起来很好，我也会出现这个错误。我做了一些研究，所以我知道php.ini文件应该包含哪些内容。因此，我的php.ini文件包含以下行：

extension="mongo.so"

在我的Mac中有两个php.ini文件，因此，为了保险起见，我把这一行放进了另一行。没有变化

我正在使用MacBookPro（13英寸，2012年年中）-操作系统X 10.11.3

任何帮助都将不胜感激