This question may be too complex for a reasonable answer on this list,
but I'll ask anyway.

If a page has static content (no PHP variables, etc.), I can
understand how caching works. The engine just checks to see if it's got
a copy of the requested page in the cache, and displays it if so, or
fetches it if not.

But if a page is populated with variables from a database (for example)
which could change from time to time, how could a caching engine
possibly cache it? How would it determine whether to re-fetch the page
or use the cached version?


Paul M. Foster

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