As Antony Dovgal points out in a new blog post today, the latest reports on PHP's code coverage have jumped up over the 50% mark (to 56.3% at the time of this post).
It took us about 2 years to get the last 5% and I believe most of the kudos should go to IBM people, who continue to contribute lots of new tests. I hope that the Testfest will help us to speed up this process.
There are still a lot of items in the red that could use some tests, so if you're looking to help out write up some tests or check your area for a TestFest event to get some help.