We always do our best to adapt the software to maintain compatibility with recent PHP versions, fixing issues as they are identified as quickly as possible.

However, we have just a small team with little resources as we support Mantis in our spare time, so it's hard for us to anticipate this as you suggest.

Since this Issue does not identify any actual bug with PHP 8.5, I'm going to set it to resolved. If you want to help, please run the static analysis yourself and provide us with a list of incompatibilities or even better, submit pull requests to fix them.

The next php release 8.5 will be released in 1 month, and is already available for testing.

@marc.kraemer
FYI I started compatibility testing on PHP 8.5 last week; overall tracking is in Issue 0036614, see child issues for details.
The good news is, there are only a few minor issues as far as I can tell.
Feel free to report new issues if you identify other problems.

Issue restored from backup following accidental deletion.