Redis for PHP

When to use

• The user wants to cache expensive query results, computed values, or fragments in memory to reduce database load and speed up responses.
• The user needs to choose or configure a Redis client for PHP — phpredis (the C extension) versus predis (pure PHP) — or connect PHP to a Redis server or cluster.
• The user wants to store sessions, rate-limiter counters, locks, or a queue backend in Redis, and needs the right data structure, expiry, and persistence.

When NOT to use