anchor.diff:  
   ###Conflicts with php<7.2
   RUN composer require --prefer-stable --update-with-all-dependencies yiisoft/log 
  +
  +
  +# psr/log-implementation 
  +RUN composer require --prefer-stable --update-with-all-dependencies yiisoft/cache
  +RUN composer require --prefer-stable --update-with-all-dependencies yiisoft/rbac
  +
   
   ##Real fails
   ##RUN composer require --prefer-stable --update-with-all-dependencies yiisoft/yii-dev
  
positive.code: RUN composer require --prefer-stable --update-with-all-dependencies psr/http-server-handler
  RUN composer require --prefer-stable --update-with-all-dependencies psr/http-server-middleware
  
  #
  RUN composer require --prefer-stable --update-with-all-dependencies yiisoft/cache
  
  #Real conflicts with yii2
  #RUN composer require --prefer-stable --update-with-all-dependencies yiisoft/yii-core
  
negative.code: 
  
  RUN composer require --prefer-stable --update-with-all-dependencies yiisoft/di
  RUN composer require --prefer-stable --update-with-all-dependencies yiisoft/view  
  RUN composer require --prefer-stable --update-with-all-dependencies yiisoft/db
  
  