RonPK - 1:55 pm on Mar 2, 2012 (gmt 0)
Version 5.4 was released yesterday.
Some of the key new features include: traits, a shortened array syntax, a built-in webserver for testing purposes and more. PHP 5.4.0 significantly improves performance, memory footprint and fixes over 100 bugs.
Here's is a migration guide: [php.net...]