(PHP 5 >= 5.2.0, PHP 7) Returns the peak of memory allocated by PHP

(PHP 4, PHP 5, PHP 7) Gets the current PHP version

(PHP 4, PHP 5, PHP 7) Returns an array with the names of all modules compiled and loaded

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

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

(PHP 4, PHP 5) Sets the current active configuration setting of magic_quotes_runtime

(PHP 4, PHP 5, PHP 7) Returns an array with the names of included or required files

(PHP 4, PHP 5, PHP 7) Set/get the various assert flags

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

(PHP 5, PHP 7 >= 5.5.0, PHP 7) Sets the process title