What's the maximum key length for PHP APC?

You would think this would be s开发者_StackOverflow中文版uper-easy to find, but I can't seem to.

There appears to be no limitation on key size/content.

Internally, keys are initialized via the C function apc_cache_make_user_key, which takes the given key string ("identifier") and stores it along with a hashed version.

I really don't know PHP, but it looks like values are added using apc_add() or apc_store(), which take keys which are strings. I would infer that the maximum key length is therefore the maximum length of a string in PHP.

According to PHP: Strings,

Note: It is no problem for a string to become very large. PHP imposes no boundary on the size of a string; the only limit is the available memory of the computer on which PHP is running.