Update information Edit(Mar.1) Edit2(Aug.3)
At Feb-20 19:06:24UTC, they released PHP5.4.12. So, I downloaded a Thread Safe version php-5.4.12-Win32-VC9-x86.zip, because I use Apache2.4 for my web server on Windows OS.
As php5apache2_4.dll included in the official PHP binary 5.4.10+, I extracted the zip archive and replaced all PHP5.4.11 files with all PHP5.4.12 files except my php.ini. Then, I restarted my Apache. That’s it.
By the way, they announced “PHP 5.4 series will be the last versions to support Windows XP and Windows 2003. We will not provide binary packages for these Windows versions anymore after PHP 5.4.” when they released PHP5.4.0 and PHP5.5 goes to Alpha5 now. It may be time before too long to meet PHP5.5 GA. I need to prepare for it (sigh).
If you need how to configure PHP5.4, please see the post on my Japanese blog. Of course, it is only in Japanese and for a mbstrings user, but I think the information gives some help for you.
If you need how to configure PHP5.5, please see “To create a Wamp-like Web Server in Windows7-#2“.