Update information Edit(Aug.3)
At Mar-15 04:08:07UTC, they released PHP5.4.13. So, I downloaded a Thread Safe version php-5.4.13-Win32-VC9-x86.zip for my server.
As php5apache2_4.dll included in the official PHP binary 5.4.10+, I extracted the zip archive and replaced all PHP5.4.12 files with all PHP5.4.13 files except my php.ini. Then, I restarted my Apache. That’s it.
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“.