Simple Caching Question

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Does PHP include any built in functions for caching? Since my page doesn't change often, I would like it to cache using an Etag. How can I do this?

 

Thanks to any replies.

[toplay]

I don't recall anything inherently build into PHP (other than buffering). You would use a PEAR package that might have caching, or use template systems such as smarty:

 

http://www.smarty.net