(PHP 5 >= 5.3.0, PHP 7) Activates the circular reference collector
(PHP 4, PHP 5, PHP 7) Gets the version of the current Zend engine
(PHP 4, PHP 5, PHP 7) Set/get the various assert flags
(PHP 4, PHP 5) Sets the current active configuration setting of magic_quotes_runtime
(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, PHP 5, PHP 7) Gets the current PHP version
(PHP 4 >= 4.3.0, PHP 5, PHP 7) Gets the current include_path configuration option
(PHP 5, PHP 7 >= 5.5.0, PHP 7) Sets the process title
(PHP 4, PHP 5, PHP 7) Returns an array with the names of all modules compiled and loaded
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