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<!-- $Revision$ -->

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<book xml:id="book.apcu" xmlns="http://docbook.org/ns/docbook" xmlns:xlink="http://www.w3.org/1999/xlink">

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<?phpdoc extension-membership="pecl" ?>

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<title>APC User Cache</title>

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<titleabbrev>APCu</titleabbrev>

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<preface xml:id="intro.apcu">

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&reftitle.intro;

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<para>

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APCu is APC stripped of opcode caching.

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APCu is an in-memory key-value store for PHP.

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Keys are of type &string; and values can be any PHP variables.

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APCu only supports userland caching of variables.

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</para>

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<para>

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The first APCu codebase was versioned 4.0.0, it was forked from the head of the APC master branch at the time.

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The APCu cache is per-process on Windows, so when using a process-based

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(rather than thread-based) SAPI, it will not be shared between different processes.

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</para>

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<para>

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PHP 7 support is available as of APCu 5.0.0.

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APCu is APC stripped of opcode caching.

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</para>

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<para>

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APCu can provide a compatibility mode, such that it can provide a drop in replacement for the applicable parts of APC.

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The first APCu codebase was versioned 4.0.0, it was forked from the head of the APC master branch at the time.

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PHP 7 support is available as of APCu 5.0.0. PHP 8 support is available as of APCu 5.1.19.

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</para>

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</preface>

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