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Till Klampaeckel's Blog: APC: get a key's expiration time

Note: This article was originally published at PHPDeveloper on 12 November 2010.
PHPDeveloper

Till Klampaeckel has shown off one of the "best kept secrets" about the APC caching tool that not many people seem to use - getting a key's expiration time that can be useful to tell other applications how long the data will be good for.

APC offers a bunch of very useful features - foremost a realpath cache and an opcode cache. However, my favorite is neither: it's being able to cache data in shared memory. How so? Simple: use apc_store() and apc_fetch() to persist data between requests. The other day, I wanted use a key's expiration date to send the appropriate headers (Expires and Last-Modified) to the client, but it didn't seem like APC supports this out of the box yet.

He includes a quick bit of sample code that defines an "apc_exire" function that grabs the expiration information as returned by apc_cache_info - the "ttl" and "creation_time" values.