On Windows this will always return 0, except when "php -r" is used, when it returns 1.
(PHP 4 >= 4.1.0, PHP 5, PHP 7)
getmygid — Get PHP script owner's GID
Gets the group ID of the current script.
Returns the group ID of the current script, or FALSE
on error.
On Windows this will always return 0, except when "php -r" is used, when it returns 1.