I am bumping this thread. I assume that it got lost a little bit with was going on over the past week. I have implemented changes to fetch_all by adding two new constants and another optional parameter. This is only MVP. Both changes can be seen together here https://github.com/php/php-src/compare/master...kamil-tekiela:mysqli-fetch_all-column
Is this something that people would want to see implemented in mysqli? Should the RFC be amended to include fetch_all() as well?