(PECL apc >= 3.1.1) Constructs an APCIterator iterator object
(PECL apc >= 3.1.1) Get current item public
(PECL apc >= 3.1.1) Move pointer to next item
(PECL apc >= 3.1.1) Checks if current position is valid
(PECL apc >= 3.1.1) Rewinds iterator public
(PECL apc >= 3.1.1) Get iterator key public
(PECL apc >= 3.1.1) Get total count public
(PECL apc >= 3.1.1) Get total cache hits public
(PECL apc >= 3.1.1) Get total cache size public