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<?xml version="1.0" encoding="utf-8"?>
<!-- $Revision$ -->
<sect1 xml:id="opcache.installation" xmlns="http://docbook.org/ns/docbook" xmlns:xlink="http://www.w3.org/1999/xlink">
&reftitle.install;
<para>
OPcache can only be compiled as a shared extension. If you have
disabled the building of default extensions with
<option role="configure">--disable-all</option>, you must compile PHP with
the <option role="configure">--enable-opcache</option> option for OPcache
to be available.
</para>
<para>
Once compiled, you can use the
<link linkend="ini.zend-extension">zend_extension</link> configuration
directive to load the OPcache extension into PHP. This can be done with
<literal>zend_extension=/full/path/to/opcache.so</literal> on non-Windows
platforms, and <literal>zend_extension=C:\path\to\php_opcache.dll</literal>
on Windows.
</para>
<note>
<para>
If you want to use OPcache with
<link xlink:href="&url.xdebug;">Xdebug</link>, you must load OPcache before
Xdebug.
</para>
</note>
<sect2 xml:id="opcache.installation.recommended">
<title>Recommended php.ini settings</title>
<para>
The following settings are generally recommended as providing good
performance:
</para>
<informalexample>
<programlisting>
<![CDATA[
opcache.memory_consumption=128
opcache.interned_strings_buffer=8
opcache.max_accelerated_files=4000
opcache.revalidate_freq=60
opcache.fast_shutdown=1 ; prior to PHP 7.2.0
opcache.enable_cli=1
]]>
</programlisting>
</informalexample>
<para>
You may also want to consider disabling
<link linkend="ini.opcache.save-comments">opcache.save_comments</link>
and enabling
<link linkend="ini.opcache.enable-file-override">opcache.enable_file_override</link>,
however note that you will have to test your code before using these in
production as they are known to break some frameworks and applications,
particularly in cases where documentation comment annotations are used.
</para>
<para>
On Windows, <link linkend="ini.opcache.file-cache-fallback">opcache.file_cache_fallback</link>
should be enabled, and <link linkend="ini.opcache.file-cache">opcache.file_cache</link>
should be set to an already existing and writable directory.
</para>
<para>
A full list of configuration directives supported by OPcache
<link linkend="opcache.configuration">is also available</link>.
</para>
</sect2>
</sect1>
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