(PECL weakref >= 0.2.0) Returns the value pointed to by a certain object

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

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

(PHP 4, PHP 5, PHP 7) Returns an array with the names of included or required files

(PECL runkit >= 0.7.0) Dynamically changes the name of the given method

(PECL apcu >= 4.0.0) Cache a variable in the data store

(PECL apc >= 3.1.1) Get current item public

(PECL apd 0.2-0.4) Throw an error, a callstack and then exit

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

(PHP 5 >= 5.5.5, PHP 7, PECL ZendOpcache > 7.0.2) Get status information about the cache