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<h2 class="title">Installation</h2>
<p class="para">
If backward compatibility with the applicable parts of APC is required,
APCu must be configured with the option --enable-apcu-bc.
</p>
<div class="warning"><strong class="warning">Warning</strong>
<p class="simpara">
PHP 7 has a separate module (<a href="http://pecl.php.net/apcu_bc" class="link external">» apc.so</a>) for backwards compatibility with APC.
</p>
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<p class="para">
In backward compatibility mode, APCu registers the applicable APC functions
with backward compatible prototypes.
</p>
<p class="para">
Where an APC function accepted <code class="parameter">cache_type</code>, it is simply
ignored by the backward compatible version, and omitted from the prototype for
the APCu version.
</p>
<blockquote class="note"><p><strong class="note">Note</strong>:
<span class="simpara">
On Windows, APCu needs a temp path to exist, and be
writable by the web server. It checks the TMP, TEMP
and USERPROFILE environment variables in that order
and finally tries the WINDOWS directory if none of
those are set.
</span>
</p></blockquote>
<blockquote class="note"><p><strong class="note">Note</strong>:
<span class="simpara">
For more in-depth, highly technical implementation details, see the
<a href="http://git.php.net/?p=pecl/caching/apc.git;a=blob;f=TECHNOTES.txt" class="link external">»
developer-supplied TECHNOTES file
</a>.
</span>
</p></blockquote>
<p class="para">
APCu sources can be found <a href="https://github.com/krakjoe/apcu" class="link external">» here</a>.
</p>
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