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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Verified Answer
This answer has been peer-reviewed by industry experts holding senior engineering roles to ensure technical accuracy and relevance for modern interview standards.
PHP interview questions and answers for beginner, junior, mid-level, senior, and expert developers. Ideal for freshers and experienced candidates preparing for PHP roles.