(PHP 4, PHP < 5.5) Gets the Zend guid string

(PECL apc >= 3.1.1) Move pointer to next item

(PECL apcu >= 5.0.0) Get iterator key public

(PHP 4 >= 4.3.2, PHP 5, PHP 7) Returns the amount of memory allocated to PHP

(PECL wincache >= 1.0.0) Retrieves information about files cached in the opcode cache

(PECL apc >= 3.1.4) Output a binary dump of cached files and user variables to a file

(PHP 4 >= 4.3.0, PHP 5, PHP 7) Sets the include_path configuration option

(PECL uopz >= 1.0.3) Restore a previously backed up function

(PECL wincache >= 1.1.0) Retrieves information about files cached in the session cache

(PECL wincache >= 1.1.0) Deletes entire content of the user cache