PHP 5.5 alpha out now
The latest version of PHP is in development state. The release of PHP 5.5 alpha was announced on 15 November 2012.
PHP 5.5.0 Alpha 1 comes with new features such as (incomplete list) :
support for Generators,
a new password hashing API,
support for finally in try/catch blocks
support for list() in foreach,
constant array/string dereferencing,
We also dropped support for Windows XP and 2003.
Since this is an alpha, DO NOT USE IN PRODUCTION SYSTEM.