This » PECL extension
is not bundled with PHP.
Information for installing this PECL extension may be
found in the manual chapter titled Installation
of PECL extensions. Additional information such as new releases,
downloads, source files, maintainer information, and a CHANGELOG, can be
The DLL for this PECL extension
may be downloaded from either the
» PHP Downloads page or from
On Windows, APC needs a temp path to exist, and be
writable by the web server. It checks TMP, TEMP,
USERPROFILE environment variables in that order
and finally tries the WINDOWS directory if none of
those are set.
For more in-depth, highly technical implementation details, see the
developer-supplied TECHNOTES file