"Apache 2 and PHP are popular (and cheap!) choices for creating
interactive Web sites. Installing Apache 2 by itself under Windows
is easy, but installing PHP 4 so it runs without restrictions with
Apache 2 is tricky.
"It doesn't help that the PHP 4.3 manual's Windows installation
section is silent on installing PHP to work with Apache 2, and the
section on Apache 2 installation is missing a lot of the
information you need. Other published installation guides contain
errors as well, leaving some installers to resort to
trial-and-error methods, such as replacing PHP's DLLs with those
from another PHP version. But instead of spending hours of
frustration trying to figure it all out, you can follow our simple
guide through the maze..."