UGRPM

// Add the user with $userId to $group
$ugrpm->addUserToGroup($userId,$group);

// AddMany users to $group
$ugrpm->addUsersToGroup([$userId1,$userId2,...],$group);

// Add user to many groups
$ugrpm->addUserToGroups($userId,[$group1,$group2,...]);

// Add many users to many groups
$ugrpm->addUsersToGroups([$uid1,$uid2,$uid3],[$group1,$group2,$group3]);

// Remove user from Group
$ugrpm->removeUserFromGroup($uid,$group);

// Remove user from many groups
$ugrpm->removeUserFromGroups($uid,[$group1,$group2,...]);

// Remove many users from group
$ugrpm->removeUsersFromGroup([$uid1,$uid2,...],$group);

// Retrieve user's groups
$ugrpm->getUserGroups($userId);

// Retrieve group's users
$ugrpm->getGroupUsers($group);

// Check if user in group
$ugrpm->userInGroup($uid,$group);