Update information Edit(Aug.3)
At Jul-03 23:29:25UTC, they released PHP5.4.17. So, I downloaded a Thread Safe version php-5.4.17-Win32-VC9-x86.zip for my server (WindowsXP SP3 (x86)).
Acoording to the ChangeLog, it has some bug fixes.
As php5apache2_4.dll included in the official PHP binary 5.4.10+, I extracted the zip archive and replaced all PHP5.4.15 files with all PHP5.4.16 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.
By the way, they also announced PHP 5.5.0 was available. It doesn’t support WindowsXP anymore. At some point in the near future, i.e. until 2014/Apr/8, I have to reconstruct my server.
Edit(Aug.3):
If you need how to configure PHP5.5, please see “To create a Wamp-like Web Server in Windows7-#2“.