(PHP 5 >= 5.3.0, PHP 7) Deactivates the circular reference collector

(PECL uopz >= 1.0.0) Extend a class at runtime

(PECL uopz >= 1.0.0) Delete a function void

(PECL uopz >= 1.0.4) Copy a function Closure

(PHP 4 >= 4.0.2, PHP 5, PHP 7) Returns information about the operating system PHP is running on

(PECL runkit >= 0.7.0) Return numerically indexed array of registered superglobals

(PECL weakref >= 0.2.0) Constructs a new map

(PHP 4 >= 4.1.0, PHP 5, PHP 7) Get PHP script owner's GID

(PHP 4 >= 4.1.0, PHP 5, PHP 7) Compares two "PHP-standardized" version number strings

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