As
others wrote, or as you can read on
php.net or in
my twitter feed we've released the second, long awaited, release candidate of PHP 5.3.0.
5.3 is rather big release including support for namespaces, closures, phar archives, internatioalization support via the new intl extension, improved SQLite support, mysqlnd as backend for the MySQL exensions, impressive performance improvements, ... and tons of other bigger and minor things.
Even though this server is running 5.3 already it's not suggested to be used in production evironments, yet but I'd really like to encourage
everybody to test it and give feedback! I'm also interested in positive
feedback, not only bug reports to support my good feeling about this release 
Essa nova versão contém suporte aos namespaces, enclosures, internacionalização (através da nova extensão intl), manipulação de arquivos phar, suporte melhorado ao SQLite, mysqld e MySQL. Possui também várias velhorias de performance. ...
Tracked: May 08, 16:06