(PHP 5 >= 5.2.0, PHP 7, PHP 8)
posix_initgroups — Calculate the group access list
posix_initgroups(string $username, int $group_id): bool
Calculates the group access list for the user specified in name.
usernameThe user to calculate the list for.
group_idTypically the group number from the password file.
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https://www.php.net/manual/en/function.posix-initgroups.php