It appears the PHP development team has not quite put the 5.2 series to bed and have released another update for it. PHP 5.2.16 addresses a regression error introduced in 5.2.15 for open_basedir implementations. If you use open_basedir in your application and are using PHP 5.2.15, you should update your PHP installation to 5.2.16 or 5.3.4.

PHP 5.2.16 also fixes a crash in the PDO::pgsql driver when attempting to retrieve data when the server is unavailable.

For a full list of changes in PHP 5.2.16, you can view the change log. And for information about migrating from 5.2 to 5.3, you can go through their migration guide.