I have found this link to be useful: http://downloads.php.net/pierre/. It contains the
.dll file you will need. For this example, I downloaded the package hp_apc-3.0.19-5.2- Win32-VC6-x86.zip and unzipped its content. Once the content was unzipped, I placed the file php_apc.dll into the PHP extensions folder. Using the default PHP directory location while installing PHP, the full location is C:Program FilesPHPext. If the
directory is not present, you can identify the location to the extensions directory by referring to the php.ini file’s setting, extension_dir. The directory specified here is used by PHP to load any external module/extension.
Finally, open the php.ini file in use and append the lines shown in Listing 4–4 at the bottom of the file. Save the changes and restart your web server.