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How does PHP interact with Redis or Memcached for caching?

Senior PHP
Quick Answer PHP connects to Redis via phpredis extension or predis library. Store cache: set key to serialized value with TTL. Read cache: get key, unserialize. Pattern: check cache first, if miss hit DB and store result. Redis also handles sessions, rate limiting counters, pub/sub, and queues. Memcached is simpler but Redis is more versatile with data structures (lists, sets, sorted sets).

Answer

PHP extensions allow storing cached data, sessions, and queues using Redis or Memcached.
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