PHP.net has a new posting today about the latest release candidate of the newest version of PHP 4.3.x:

PHP 4.3.10RC1 has been released for testing. This is the first release candidate and should have a very low number of problems and/or bugs. Nevertheless, please download and test it as much as possible on real-life applications to uncover any remaining issues.

To help out with the testing of this release candidate, hop on over to qa.php.net and check out the testing options to contribute your two cents to the cause...