Memcached Object Cache

Overview

Memcached object cache stores WordPress objects in Memcached to reduce database load. ZiziCache supports both PHP extensions: memcached (modern) and memcache (legacy).

Requirements

• PHP extension: memcached or memcache.
• Write access to wp-content/ (for object-cache.php drop-in).
• Write access to wp-config.php (for server list and optional credentials).

Enable in the UI

1. Open ZiziCache Memcached.
2. Enter servers (one per line): host:port or unix:///path/to/socket.
3. Optional: set key salt and SASL credentials (if your Memcached server requires them).
4. Click Test Connection, then enable Memcached.

What ZiziCache changes

• Installs wp-content/object-cache.php from a backend-specific template.
• Writes $memcached_servers and optional constants (key salt, SASL credentials, timeouts) to wp-config.php.

Connection testing and safety

• Connection tests are rate-limited (per user, 5minute window).
• Server addresses are validated to reduce SSRF/portscan abuse.

WP-CLI

# Flush object cache (backend-agnostic)
wp zizi-cache object-cache-flush

REST API

• GET /wp-json/zizi-cache/v1/memcached-status
• POST /wp-json/zizi-cache/v1/memcached-test
• POST /wp-json/zizi-cache/v1/memcached-flush
• GET /wp-json/zizi-cache/v1/memcached-environment

Backend selection

• If memcached is available, it is preferred.
• If only memcache is available, ZiziCache uses it automatically.

Mutual exclusivity

Only one object cache backend can be active at a time. Enabling Memcached disables Redis and vice versa.