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

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

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

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

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

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

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

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

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

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