anchor.diff:  # Install pecl extensions
   RUN pecl install \
           mongodb \
  -        xdebug-2.6.0beta1 && \
  +        xdebug-2.7.0RC2 && \
       docker-php-ext-enable \
           mongodb.so \
           xdebug
  
positive.code: 
  # Install vendor
  COPY ./composer.json /repo/composer.json
  RUN composer install --prefer-dist --optimize-autoloader
  
  # Add source-code
  COPY . /repo
  
negative.code:             git \
              zlib1g-dev \
              libssl-dev \
              libzip-dev \
              unzip \
          --no-install-recommends && \
          apt-get clean && \
          rm -rf /var/lib/apt/lists/* /tmp/* /var/tmp/*
  