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

(PHP 4 >= 4.1.0, PHP 5, PHP 7) Compares two "PHP-standardized" version number strings

(PHP 4 >= 4.0.2, PHP 5, PHP 7) Returns information about the operating system PHP is running on

(PHP 4, PHP 5, PHP 7) Alias of

(PHP 4, PHP 5, PHP 7) Gets the current active configuration setting of magic_quotes_runtime

(PHP 4, PHP 5, PHP 7) Limits the maximum execution time

(PHP 4 >= 4.1.0, PHP 5, PHP 7) Get PHP script owner's GID