A complete guide to Redis in PHP — the Predis and PhpRedis drivers, Redis data structures (String, Hash, List, Set, Sorted Set), common caching patterns, session storage, rate limiting, pub/sub, Lua scripting, pipelines and transactions, and when Redis is the right choice.
A complete guide to Memcached in PHP — the Memcached vs Memcache drivers, connections and server pools, basic set/get/delete operations, CAS (Check and Set) for atomic updates, expiration times, namespaces and group key invalidation, comparing Memcached vs Redis, and proper caching patterns.