andrejcremoznik/wp-cache-helper

Wrapper for WordPress caching functions

WP Cache Helper

A wrapper class for WordPress caching functions., _(*1)

What is this?

WordPress provides some caching functions that make it needlessly hard to invalidate previously saved caches. The idea here is to version cache keys by appending a number. So instead of caching something with a key mycache it's cached as mycacheN where N is an integer we increment every time the cache needs to be invalidated (like in save_post hook)., _(*2)

Installation

Copy the src/WpCacheHelper.php file to your project and require it require_once('path/to/WpCacheHelper.php');., _(*3)

Or with composer: composer require andrejcremoznik/wp-cache-helper., _(*4)

Usage

use \AndrejCremoznik\WpCacheHelper\WpCacheHelper as Cache;

function do_something_expensive() {
    $cache = new Cache('data_key');
    $expensive_data = $cache->get();

    if ($expensive_data === false) {
        $expensive_data = get_expensive_data();
        $cache->set($expensive_data);
    }

    return $expensive_data;
}

echo do_something_expensive();

Invalidate cache on post save / delete

function invalidate_cache() {
    Cache::flush()
}
add_action('save_post',    'invalidate_cache');
add_action('deleted_post', 'invalidate_cache');