APC 用户缓存
- 简介
- 安装/配置
- 预定义常量
- APCu 函数
- apcu_add — 缓存一个新变量到存储中
- apcu_cache_info — 从 APCu 存储中获取缓存信息
- apcu_cas — Updates an old value with a new value
- apcu_clear_cache — Clears the APCu cache
- apcu_dec — Decrease a stored number
- apcu_delete — Removes a stored variable from the cache
- apcu_enabled — Whether APCu is usable in the current environment
- apcu_entry — Atomically fetch or generate a cache entry
- apcu_exists — Checks if entry exists
- apcu_fetch — Fetch a stored variable from the cache
- apcu_inc — Increase a stored number
- apcu_key_info — Get detailed information about the cache key
- apcu_sma_info — Retrieves APCu Shared Memory Allocation information
- apcu_store — 缓存一个变量到存储中
- APCUIterator — APCUIterator 类
- APCUIterator::__construct — Constructs an APCUIterator iterator object
- APCUIterator::current — Get current item
- APCUIterator::getTotalCount — Get total count
- APCUIterator::getTotalHits — Get total cache hits
- APCUIterator::getTotalSize — Get total cache size
- APCUIterator::key — Get iterator key
- APCUIterator::next — Move pointer to next item
- APCUIterator::rewind — Rewinds iterator
- APCUIterator::valid — Checks if current position is valid
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User Contributed Notes 2 notes
boefje at hotmail dot com ¶
2 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APCu is the official replacement for the outdated APC extension.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then created APCu, which offers only the object caching (read "in memory data caching") functionality (they removed the outdated opcache).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?
}
?>
alex at modula-shop-systems dot de ¶
1 year ago
For PHP-FPM :
Note that all ini values are PHP_INI_SYSTEM and can't be set via php_admin_value in pool.d/xxx.conf and therefore not via different webhosting control/configuration panels.
Use /etc/php/7.x/fpm/conf.d/20-apcu.ini or /etc/php/7.x/fpm/php.ini