3
If you want to help, install
Xoops 2.0.8 on a
test site (not a production site), and see if it works correctly with PHP5.
Note that XOOPS 2.0.8 is
not an official release, and does
not include the changes made in 2.0.7.1, 2.0.7.2 and 2.0.7.3. But it does include changes that were intended to make it compatible with PHP5.
I would test it myself, except I haven't been able to get PHP5 installed properly on my computer.