(PECL wincache >= 1.1.0) Retrieves information about user cache memory usage

(PHP 4, PHP 5, PHP 7) Gets the version of the current Zend engine

(PECL bcompiler >= 0.5) Writes a defined function as bytecodes

(PECL apcu >= 5.0.0) Get total cache hits

(PHP 4, PHP 5, PHP 7) Set/get the various assert flags

(PECL apd >= 0.2) Echo to the debugging socket

(PECL runkit >= 0.7.0) Runkit Sandbox Class -- PHP Virtual Machine

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

(PECL weakref >= 0.1.0) Releases a previously acquired reference

(PHP 4, PHP 5, PHP 7) Returns an array with the names of all modules compiled and loaded