"The PHP development team is proud to announce the immediate release of PHP 5.2.0. This release is a major improvement in the 5.X series, which includes a large number of new features, bug fixes and security enhancements. Further details about this release can be found in the release announcement 5.2.0, the full list of changes is available in the ChangeLog" - PHP.Net

Patch Link: http://www.php.net/downloads.php