The PHP development team has released the latest beta version of the PHP 5.4.x series for testing - 5.4.0beta1.

Release candidates are development packages released to check if any critical problems have slipped into the code during the previous development period. Release candidates are NOT for production use, they are for testing purposes only even though in most cases there are almost no differences between the general availability (GA) release and the last RC. You can help the PHP Team and yourself detect problems by installing and testing release candidates on your own (non-production!) server.

You're encouraged to compile this version on your platform and include the "make test" command in the process to report any issues found directly back to the PHP dev group. Windows users can find the latest binaries over on windows.php.net.