(PECL apc >= 3.0.0) Cache a variable in the data store

(PECL apcu >= 5.1.0) Atomically fetch or generate a cache entry

(PECL apc >= 3.0.0) Removes a stored variable from the cache

(PECL apc >= 3.1.1) Increase a stored number

(PECL apc >= 2.0.0) Clears the APC cache

(PECL apc >= 3.1.4) Load a binary dump into the APC file/user cache

(PECL apcu >= 4.0.0) Cache a variable in the data store

(PECL apcu >= 4.0.0) Retrieves cached information from APCu's data store

(PECL apc >= 3.0.13) Cache a new variable in the data store

(PECL apcu >= 4.0.0) Retrieves APCu Shared Memory Allocation information