WordPress APCu Object Cache Backend

Contributors: l3rady
Tags: APCu, object cache, backend, cache, performance, speed
Requires at least: 5.6
Tested up to: 6.5.3
Stable tag: 1.2

WordPress APCu Object Cache Backend provides a persistent memory-based backend for the WordPress object cache.

Description

WordPress APCu Object Cache Backend provides a persistent memory-based backend for the WordPress object cache.

An object cache is a place for WordPress and WordPress extensions to store the results of complex operations. On subsequent loads, this data can be fetched from the cache, which will be must faster than dynamically generating it on every page load.

Be sure to read the installation instructions, as this is not a traditional plugin, and needs to be installed in a specific location.

This object cache is a fork of Mark Jaquith's APC Object Cache Backend. There are a number of bugs in that version that have been ignored so I decided to write my own version. The object cache has been pretty much been re-written but some of the best bits from Marks version has been cherry picked over to this version.

Composer Installation

This plugin is marked as a wordpress-dropin type and can be installed automatically via composer using composer-dropin-installer.

Once the composer-dropin-installer is installed and configured in your project you can run composer require l3rady/object-cache-apcu. If set up correctly this should place the object-cache.php file into the your WordPress content dir, usually wp-content.

Manual Installation

1. Verify that you have PHP 7.2+ and a compatible APCu version installed.
2. Copy object-cache.php to your WordPress content directory (wp-content/ by default).
3. Done!

Frequently Asked Questions

I share wp-config.php among multiple WordPress installs. How can I guarantee key uniqueness?

Define WP_APCU_KEY_SALT to something that is unique for each install (like an md5 of the MySQL host, database, and table prefix).

Changelog

1.2

• Add composer file and add dropin plugin to packagist.org for easy installation via composer.
• Add latest cache methods added to core recentlys

1.1

• Add local array cache to reduce APCu calls for repeated requests to same keys during page load. Props to rob006
• Add WP_APCU_LOCAL_CACHE define to disable local cache for edge cases where local cache can cause memory exhaustion issues

1.0.1

• Make $cache_hits and $cache_misses public params for stats plugins to access

1.0

• Initial release, forked from WordPress-APC-Object-Cache