There’s a movement afoot to speed adoption of PHP 5. PHP 4 came out in 2000, and it’s been three years since v5 came out, but many hosts still don’t support it. Developers are sick of having to continue to support v4. And who can blame them? There are some brilliant improvements in the latest version. So a gauntlet has been thrown down: come February 5, 2008, developers should stop supporting v4, and hosts should upgrade by then.