Symfony Cache 组件除了实现 PSR6 接口外，还增加了 Adapter 用于存储 cache
Adapter: It implements the actual caching mechanism to store the information in the filesystem, in a database, etc. The component provides several ready to use adapters for common caching backends (Redis, APCu, Doctrine, PDO, etc.)
Adapter: It implements the actual caching mechanism to store the information in the filesystem, in a database, etc. The component provides several ready to use adapters for common caching backends (Redis, APCu, Doctrine, PDO, etc.)
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