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\$cache_id {#variable.cache.id}

Persistent cache_id identifier. As an alternative to passing the same $cache_id to each and every function call, you can set this $cache_id and it will be used implicitly thereafter.

With a $cache_id you can have multiple cache files for a single call to display() or fetch() depending for example from different content of the same template. See the caching section for more information.