(PECL bcompiler >= 0.4) Writes a defined class as bytecodes

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

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

(PECL weakref >= 0.2.0) Constructs a new map

(PHP 4, PHP 5, PHP 7) Limits the maximum execution time

(PECL runkit >= 0.7.0) Replace a function definition with a new implementation

(PHP 4 >= 4.0.1, PHP 5, PHP 7) Generates a user-level error/warning/notice message

(PECL apcu >= 4.0.0) Decrease a stored number

(PECL apcu >= 4.0.0) Fetch a stored variable from the cache

(PHP 5 >= 5.6.0, PHP 7, PECL ZendOpcache >= 7.0.4) Tells whether a script is cached in OPCache