当我尝试使用composer安装doctrine / mongodb-odm-bundle和doctrine / mongodb时，将引发错误。
composer require doctrine/mongodb-odm-bundle doctrine/mongodb
Using version ^3.5 for doctrine/mongodb-odm-bundle
Using version ^1.6 for doctrine/mongodb
./composer.json has been updated
Loading composer repositories with package information
Updating dependencies (including require-dev)
Your requirements could not be resolved to an installable set of packages.
Problem 1
- doctrine/mongodb 1.6.3 requires ext-mongo ^1.6.7 -> the requested PHP extension mongo is missing from your system.
- doctrine/mongodb 1.6.2 requires ext-mongo ^1.6.7 -> the requested PHP extension mongo is missing from your …