The PHP development group has officially released the alpha3 of PHP 5.4 as ready for testing. Rasmus Lerdorf comments:

PHP 5.4 alpha3 is available for testing now. Please give us a hand and compile it on your platform and run a "make test". Download it from http://qa.php.net and you can see the changes in the NEWS file at http://t.co/bBVGj8P

Updates in this alpha include the shortened array syntax, binary numbers format, support for the "Class::{expr}()" syntax, removal of magic quotes related features, a change to include E_STRICT in E_ALL and several others. Head over to the PHP QA site and download this latest version to test in your environment. Remember, environments are unique, so the more test results the better - it helps make for a better quality end result.