(PECL apc >= 3.0.0) Defines a set of constants for retrieval and mass-definition

(PECL apc >= 3.1.1) Get total cache size public

(PECL apcu >= 5.0.0) Move pointer to next item

(PECL apcu >= 4.0.0) Decrease a stored number

(PECL apcu >= 5.0.0) Get current item public

(PECL apcu >= 4.0.0) Increase a stored number

(PECL apc >= 3.1.1) Get total cache hits public

(PECL apcu >= 5.0.0) Checks if current position is valid

(PECL apcu >= 4.0.0) Checks if entry exists