Horde HashTable

Key/Value store abstraction with driver-specific capabilities for Redis native data structures, cross-process locking and transparent serialization of mixed PHP values.

Interfaces

Interface	Capability
HashTable	get/set/delete/exists with mixed values and optional TTL
LockableHashTable	Cross-process lock/unlock (Redis, Memcache)
RedisHashTable	Atomic counters, hashes, lists, sets, TTL introspection

Drivers

Driver	Implements	Backend
Driver\Redis	RedisHashTable	ext-redis (preferred) or Predis ^3
Driver\Memcache	LockableHashTable	Horde\Memcache\MemcacheApi
Driver\Memory	HashTable	In-process array (testing/development)
Driver\NullDriver	HashTable	No-op (always misses)

Installation

composer require horde/hashtable

For Redis (recommended):

# Preferred: C extension
pecl install redis

# Fallback: pure PHP
composer require predis/predis:^3

Usage

use Horde\HashTable\Driver\Redis;
use Redis as PhpRedis;

$client = new PhpRedis();
$client->connect('127.0.0.1', 6379);

$ht = new Redis(client: $client, prefix: 'myapp_');

// Basic key-value
$ht->set('user:1', ['name' => 'Alice'], ttl: 3600);
$data = $ht->get('user:1');  // returns array or null

// Locking
$ht->lock('user:1');
try {
    $ht->set('user:1', ['name' => 'Bob']);
} finally {
    $ht->unlock('user:1');
}

// Redis-native structures
$ht->increment('counter');
$ht->listPush('queue', $job);
$ht->hashSet('session:abc', 'last_access', time());
$ht->setAdd('tags:post:1', 'php', 'redis');

Horde Core Integration

When used inside a Horde application, you can obtain instances via dependency injection:

use Horde\HashTable\HashTable;
use Horde\HashTable\LockableHashTable;
use Horde\HashTable\RedisHashTable;

// Any configured driver
$ht = $injector->get(HashTable::class);

// Only drivers with real cross-process locking
$ht = $injector->get(LockableHashTable::class);

// Full Redis power (counters, hashes, lists, sets)
$ht = $injector->get(RedisHashTable::class);

Configuration is read from conf.php under the hashtable key by Horde\Core\Factory\HashTableFactory.

Legacy API

The PSR-0 classes under lib/ (Horde_HashTable_Base, Horde_HashTable_Predis, etc.) remain available for backward compatibility. New code should use the PSR-4 interfaces in src/. See doc/UPGRADING.md for migration details.

License

LGPL-2.1-only — see LICENSE.