问题
Does memcached entries with expiry time set to 0 not expire - as mentioned in the PHP Memcached docs, but not mentioned in the memcached protocol spec?
I am using spymemcached client and the docs for spymemcached does not say anything about it either.
回答1:
Setting expiration to 0 means the item has no expiration. Therefore it will never expire.
来源：https://stackoverflow.com/questions/22212647/memcached-entry-expiration-set-to-0