(PHP 4 >= 4.3.0, PHP 5, PHP 7) Gets the current include_path configuration option

(PHP 4 >= 4.1.0, PHP 5, PHP 7) Returns an associative array with the names of all the constants and their

(PHP 5 >= 5.3.0, PHP 7) Activates the circular reference collector

(PHP 7) Returns active resources array get_resources

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

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

(PHP 4, PHP 5, PHP 7) Gets PHP's process ID int

(PHP 4, PHP 5, PHP 7) Sets the value of an environment variable

(PHP 7) Reclaims memory used by the Zend Engine memory manager

(PHP 4 >= 4.3.0, PHP 5, PHP 7) Sets the include_path configuration option