php-doc-en/reference/apcu/book.xml

<?xml version="1.0" encoding="utf-8"?>
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<book xml:id="book.apcu" xmlns="http://docbook.org/ns/docbook" xmlns:xlink="http://www.w3.org/1999/xlink">
 <?phpdoc extension-membership="pecl" ?>
 <title>APC User Cache</title>
 <titleabbrev>APCu</titleabbrev>

 <preface xml:id="intro.apcu">
  &reftitle.intro;
  <para>
   APCu is an in-memory key-value store for PHP.
   Keys are of type &string; and values can be any PHP variables.
   APCu only supports userland caching of variables.
  </para>
  <para>
   APCu is APC stripped of opcode caching.
  </para>
  <para>
   The first APCu codebase was versioned 4.0.0, it was forked from the head of the APC master branch at the time.
  </para>
  <para>
   PHP 7 support is available as of APCu 5.0.0.
  </para>
  <para>
   APCu can provide a compatibility mode, such that it can provide a drop in replacement for the applicable parts of APC.
  </para>
 </preface>

 &reference.apcu.setup;
 &reference.apcu.constants;
 &reference.apcu.reference;
 &reference.apcu.apcuiterator;

</book>

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