anchor.diff:  ## needs php 7.2 AND conflicts with yii2
   
   RUN composer require --prefer-stable --update-with-all-dependencies php-extended/php-http-message-factory-psr17
  -RUN composer global require --prefer-stable --update-with-all-dependencies yiisoft/log
  -RUN composer require --update-with-all-dependencies yiisoft/log
  +
   RUN composer require --prefer-stable --update-with-all-dependencies yiisoft/cache
   RUN composer require --prefer-stable --update-with-all-dependencies yiisoft/di
   RUN composer require --prefer-stable --update-with-all-dependencies yiisoft/rbac
  
positive.code: #
  
  # Pull base image.
  FROM tamboraorg/crephpdev:2011.0
  MAINTAINER Michael Kahle <michael.kahle@yahoo.de> 
  
  ARG BUILD_YEAR=2011
  
negative.code: 
  ###Possible conflicts with yii2
  
  
  ###Conflicts with php<7.2
  #RUN composer require --prefer-stable --update-with-all-dependencies yiisoft/log 
  
  ##Real fails
  ##RUN composer require --prefer-stable --update-with-all-dependencies yiisoft/yii-dev
  ##RUN composer require --prefer-stable --update-with-all-dependencies yiisoft/yii-twig
  