The latest version of PHP in the 5.4.0 release candidate series has been posted - PHP 5.4.0 RC4, complete with new features and lots of bugfixes.
The PHP development team is proud to announce the 4th release candidate of PHP 5.4. PHP 5.4 includes new language features and removes several legacy (deprecated) behaviours. Windows binaries can be downloaded from the Windows QA site. THIS IS A RELEASE CANDIDATE - DO NOT USE IT IN PRODUCTION! This is the 4th release candidate. The release candidate phase is intended as a period of bug fixing prior to the stable release. No new features should be included before the final version of PHP 5.4.0.
Updates in this release candidate include an update to the max_input_vars directive and a fix for a segfault in the traits code. You can find the full notes for the release in the NEWS file and can download the latest from the PHP.net site - source downloads, Windows binaries.