PHP.net has announced the release of PHP 5.5 alpha3, the latest alpha in this upcoming release. This is only a preview release and should not be considered (in any way, shape or form) as usable in production.
The PHP development team announces the release of PHP 5.5.0alpha3. This release adds few features and fix some bugs from alpha2. All users of PHP are encouraged to test this version carefully, and report any bugs in the bug tracking system.
There's a few new things that have come with this update including the "Generator::throw()" method, a few additional cURL methods, Max-Age attribute support in setcookie and some bugfixes in mysqlnd and the PHP core code (see here for the full list). Please download this latest alpha and test it out in your application. Windows binaries are here.