(PHP 5 >= 5.3.0, PHP 7) Returns status of the circular reference collector
(PHP 4, PHP 5, PHP 7) Returns an array with the names of the functions of a module
(PHP 4 >= 4.0.1, PHP 5, PHP 7) Returns the type of interface between web server and PHP
Dummy for main() There is no function named
(PHP 4, PHP 5, PHP 7) Find out whether an extension is loaded
(PHP 5 >= 5.2.1, PHP 7) Returns directory path used for temporary files
(PHP 4 >= 4.2.0, PHP 5, PHP 7) Gets all configuration options
(PHP 4, PHP 5, PHP 7) Prints out the credits for PHP
(PHP 4 >= 4.3.0, PHP 5, PHP 7) Gets options from the command line argument list
(PHP 4, PHP 5, PHP 7) Loads a PHP extension at runtime
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