This is a very short post which will probably become irrelevant by the time someone sees it, but if you are a PHP developer using eclipse you might have noticed that your compare viewer is not working. I ran into this a few times before bothering to do a bit of research and found this bug report.
So it looks like the bug has been fixed but has not yet been released. So for those who want their compare viewer working again and don’t want to read the bug report, the solution is go to Help – Install New Software – Add a new site (link below) and select PHP Development Tools (PDT) Runtime Feature, and the SDK if you want it. Heres the link: