(PECL apcu >= 4.0.0) Retrieves cached information from APCu's data store

(PHP 4, PHP 5, PHP 7) Sets the value of a configuration option

(PHP 4, PHP < 5.5) Gets the Zend guid string

(PECL apcu >= 4.0.0) Retrieves APCu Shared Memory Allocation information

(PECL runkit >= 0.7.0) Specify a function to capture and/or process output from a runkit sandbox

(PHP 7) Returns active resources array get_resources

(PECL apc >= 3.1.1) Checks if current position is valid

(PECL weakref >= 0.2.0) Rewinds the iterator to the beginning of the map

(PHP 4, PHP 5, PHP 7) Outputs information about PHP's configuration

(PHP 4, PHP 5, PHP 7) Gets the current resource usages