Dhii - Redis Cache

A PSR-16-compliant Redis cache wrapper.

Requirements

• PHP 7.4 - 8.2;
• Redis >= 2.6.12.

Details

Use a factory to easily create cache pools.

use Dhii\RedisCache\CachePoolFactory;
/** @var Redis $redis */

$factory = new CachePoolFactory($redis);
$cache = $factory->createCachePool();
$cache->has('mykey');
$cache->clear(); // Empties DB

A common approach is to prefix keys with a delimited namespace. These will become logically isolated, and can be cleared all at once.

// .. continued from previous example
use Dhii\RedisCache\CachePoolFactory;
use Dhii\RedisCache\KeyPrefixingCachePoolFactory;
/** @var Redis $redis */
/** @var CachePoolFactory $factory */

$namespace = 'mystuff';
$prefix = "{$namespace}:";

/*
 * It's important to use the same `Redis` instance
 * for the prefixing factory as for the base one,
 * because they SHOULD operate on the same database.
 * This is relevant specifically for `clear()`, as
 * the prefixing factory has to find keys by prefix,
 * whereby base cache will empty the whole DB.
 */
$prefixingFactory = new KeyPrefixingCachePoolFactory($factory, $redis);
$prefixingCache = $prefixingFactory->createCachePoolWithPrefix($prefix);
$prefixingCache->has('mykey'); // Actually checks for `mystuff:mykey`
$prefixingCache->clear(); // Removes keys that match `mystuff:*` only

Notes

Started with dhii/php-project.

Looking for a transient cache for WordPress? Try wp-oop/transient-cache!