APC User Cache

    Introduction

    APCu est un tableau associatif stocké en mémoire pour PHP. Les clés sont de type chaîne de caractères et les valeurs sont des variables PHP de tout type. APCu ne gère que la mise en cache de variables de l'espace utilisateur.

    Le cache APCu est par processus sous Windows, donc lors de l'utilisation d'un SAPI basé sur les processus (plutôt que sur les threads), il ne sera pas partagé entre différents processus.

    APCu, c'est APC sans la mise en cache du code opération.

    La première version est 4.0.0, ce fut un embranchement logiciel de la tête de la branche maître d'APC de l'époque. La prise en charge de PHP 7 est disponible à partir d'APCu 5.0.0. La prise en charge de PHP 8 est disponible à partir d'APCu 5.1.19.

    Found A Problem?

    Learn How To Improve This Page • Submit a Pull Request • Report a Bug
    ＋add a note

    User Contributed Notes 1 note

    up
    44
    boefje at hotmail dot com
    5 years ago
    To use apcu, the apcu extension has to be installed. You can find it here https://pecl.php.net/package/APCu

Note: apcu is not the same as apc! 

APCu is the official replacement for the outdated APC extension. APC provided both opcode caching (opcache) and object caching. As PHP versions 5.5 and above include their own opcache, APC was no longer compatible, and its opcache functionality became useless. The developers of APC then created APCu, which offers only the object caching (read "in memory data caching") functionality (they removed the outdated opcache).

Wondering how to use apcu? The following example should give you a basic understanding.

<?php

date_default_timezone_set('Europe/Amsterdam');

$apcuAvailabe = function_exists('apcu_enabled') && apcu_enabled();

if($apcuAvailabe)
{
    //apcu_clear_cache();
    
    $test1 = apcu_fetch('test1');
    $test2 = apcu_fetch('test2');
}

$test1[] = rand(1, 1000);
$test2[] = rand(1, 1000);

if($apcuAvailabe)
{
    apcu_store('test1', $test1);
    apcu_store('test2', $test2);
}

echo sprintf('current - value = %s<br/>', implode(' ,', $test1));
echo sprintf('current - value = %s<br/>', implode(' ,', $test2));

$aPCUIterator = new APCUIterator();

echo sprintf('totalCount = %s<br/>', $aPCUIterator->getTotalCount());
//echo sprintf('totalHits = %s<br/>', $aPCUIterator->getTotalHits()); // Not implemneted/available?
echo sprintf('totalSize = %s<br/>', $aPCUIterator->getTotalSize());

echo '----------------------------------<br/>';

$aPCUIterator->rewind();
echo sprintf('key = %s<br/>', $aPCUIterator->key());
echoCurrent($aPCUIterator->current());
$aPCUIterator->next();

echo '----------------------------------<br/>';

echo sprintf('key = %s<br/>', $aPCUIterator->key());
echoCurrent($aPCUIterator->current());
echo sprintf('valid = %s<br/>', $aPCUIterator->valid() ? 'true' : 'false');

function echoCurrent($current)
{
    
    echo sprintf('current - type = %s<br/>', $current['type']);
    echo sprintf('current - key = %s<br/>', $current['key']);
    echo sprintf('current - value = %s<br/>', implode(' ,', $current['value']));
    //echo sprintf('current - num_hits = %s<br/>', $current['num_hits']); // Not implemneted/available?
    echo sprintf('current - mtime = %s<br/>', date("d-m-Y H:i:s", $current['mtime']));
    echo sprintf('current - creation_time = %s<br/>', date("d-m-Y H:i:s", $current['creation_time']));
    echo sprintf('current - deletion_time = %s<br/>', date("d-m-Y H:i:s", $current['deletion_time']));
    echo sprintf('current - access_time = %s<br/>', date("d-m-Y H:i:s", $current['access_time']));
    //echo sprintf('current - ref_count = %s<br/>', $current['ref_count']); // Not implemneted/available?
    echo sprintf('current - mem_size = %s<br/>', $current['mem_size']);
    //echo sprintf('current - ttl = %s<br/>', $current['ttl']); // Not implemneted/available?
}

?>
    ＋add a note
    To Top