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

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

(PHP 4 >= 4.3.0, PHP 5, PHP 7) Return a list of .ini files parsed from the additional ini dir

(PHP 4 >= 4.3.2, PHP 5, PHP 7) Returns the amount of memory allocated to PHP

(PHP 4, PHP 5, PHP 7) Gets the name of the owner of the current PHP script

(PHP 4, PHP 5, PHP 7) Gets time of last page modification

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

(PHP 5 >= 5.3.0, PHP 7) Forces collection of any existing garbage cycles

(PHP 4, PHP 5, PHP 7) Gets PHP script owner's UID

(PHP 5 >= 5.3.0, PHP 7) Returns status of the circular reference collector