(PHP 4, PHP 5, PHP 7) Returns an array with the names of the functions of a module

(PHP 5 >= 5.5.0, PHP 7, PECL ZendOpcache >= 7.0.0) Resets the contents of the opcode cache

(PECL wincache >= 1.1.0) Retrieves information about session cache memory usage

(PECL uopz >= 1.0.3) Backup a function void

(PECL wincache >= 1.0.0) Retrieves information about opcode cache memory usage

(PECL bcompiler >= 0.5) Writes all functions defined in a file as bytecodes

(PHP 4 >= 4.3.0, PHP 5, PHP 7) Gets options from the command line argument list

(PHP 4, PHP 5, PHP 7) Gets the current configuration setting of magic_quotes_gpc

(PECL weakref >= 0.2.0) Checks whether a certain object is in the map

(PECL runkit >= 0.7.0) Convert a base class to an inherited class, add ancestral methods when appropriate