Why Caching Matters in PHP
Understand cache hit/miss, TTL, and when caching helps vs hurts.
The Performance Problem
Every uncached web request may involve: routing, authentication, database queries, template rendering, and possibly external API calls. This stack can easily take 100-500ms+.
What Caching Does
Caching stores the result of an expensive operation. On subsequent requests, the cached result is returned instantly without re-running the operation.
All lessons in this course
- Why Caching Matters in PHP
- Redis as a PHP Cache Backend
- Memcached for Session and Object Caching
- Cache Invalidation Patterns