Migrating CI3 to CI4

I don’t know about MySQL 8. The CI3 web apps I maintain on PHP7 uses Oracle.

For upgrading, I recommend reading the instructions from one version to the other, but just copy the system folder at the end from the 3.1.11 version.

http://codeigniter.com/userguide3/instal...ading.html

thanks I will do that. already checked through and could not find anything. will create a clone for my setup to try out. could not find anything that would affect me - none of the functions mentioned in the upgrade path are used on my site.