(PECL runkit >= 0.7.0) Redefine an already defined constant

(PHP 5, PHP 7) Sets a user-defined exception handler function

(PECL weakref >= 0.2.0) Returns whether the iterator is still on a valid map element

(PECL apcu >= 5.0.0) Rewinds iterator public

(PECL apc >= 3.1.1) Get total count public

(PECL bcompiler >= 0.5) Writes an included file as bytecodes

(PECL apd 0.2-0.4) Changes or sets the current debugging level

(PECL weakref >= 0.2.0) Updates the map with a new key-value pair

(PECL apc >= 3.1.1) Get iterator key public

(PECL weakref >= 0.1.0) Constructs a new weak reference