The main PHP.net site has officially announced the release of the latest beta in the PHP 5.6.0 series: PHP 5.6.0beta4.
The PHP development team announces the immediate availability of PHP 5.6.0beta4. As we entered the feature freeze with beta1, this is a bugfix-only release. All users of PHP are encouraged to test this version carefully, and report any bugs in the bug tracking system. The beta phase is officially closed with this release. A couple of RCs are to be expected, until we are confident that the release is stable enough for the final release. For that, we really need your help in testing and reporting any problems that you encounter.
This is not a production release and should not be used in any kind of production environment. You can find out more information about the major updates in this evolving documentation. You can see all of the changes in this beta release in the included NEWS file. You can download this latest beta from the PHP QA site or here for the Windows binaries.