asterbini
commented
2 years ago I have been able to convert the Q2A code to PHP 8.1 by using the rector project (https://github.com/rectorphp/rector). Moreover, GD images are no more resources in 8.1 but objects and I had to change util/image.php a little to show avatars. (now that I look for is_resource in the rest of the code I see that I must change also app/upload.php and app/blobs.php)
svivian
I recently tried to set up a q2a site using php 8.1, and first of all I was unable to run the install wizard from the browser, so I had to manually do that through the code.
After that I was able to load the site, but it is covered with warnings (see screenshot).
It seems that from php 8.1 passing in null to strlen is deprecated, and eventually will throw a TypeError in later releases. see: https://php.watch/versions/8.1/internal-func-non-nullable-null-deprecation
I'm assuming there are other functions where similar warnings occur as well.
I have since reverted to php 8.0 and things seem to be working fine but I imagine this will be an issue going forward.