(PECL apc >= 3.0.13) Stores a file in the bytecode cache, bypassing all filters.

(PHP 5 >= 5.5.0, PHP 7, PECL ZendOpcache >= 7.0.0) Invalidates a cached script

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

(PECL wincache >= 1.0.0) Refreshes the cache entries for the cached files

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

(PHP 4, PHP 5, PHP 7) Loads a PHP extension at runtime

(PHP 4 >= 4.0.1, PHP 5, PHP 7) Returns the type of interface between web server and PHP

(PHP 4, PHP 5, PHP 7) Prints out the credits for PHP

(PECL runkit >= 0.7.0) Similar to define(), but allows defining in class definitions as well

(PECL apd 0.2-0.4) Return all persistent resources as an array