[RFC] Support TTL

[WyriHaximus]

I've been thinking about how we can improve caching and what I would really like to see is TTL support in cache adapters. With that the DNS component only store a message contents in the cache and gives it a TTL. The DNS component also doesn't have to do the GC as that becomes the responsibility of the adapter. In cache of a redis adapter redis can take care of that. But for the array cache another mechanism has to be devised.

[clue]

👍

See also the upcoming SimpleCache PSR: https://www.reddit.com/r/PHP/comments/4mq1ff/psrsimplecache_you_asked_for_a_simple_caching/

[WyriHaximus]

That would be awesome. I gladly create a PR for that when it gets accepted.

[WyriHaximus]

@clue FYI PSR-16, the simple cache PSR, has gone into review: https://groups.google.com/forum/#!msg/php-fig/kSj_yVbkwOw/xVhW1D2FAwAJ