/**
* Return the users who are members of the given group(s). In case of multiple groups,
* users who are members of at least one of them are returned.
*
* @param string|array $groups A single group name or an array of group names
* @param int $limit Max number of users to return. The actual limit will never exceed 5000
* records; larger values are ignored.
* @param int $after ID the user to start after
* @return UserArrayFromResult
*/
public static function findUsersByGroup($groups, $limit = 5000, $after = null)
{
if ($groups === []) {
return UserArrayFromResult::newFromIDs([]);
}
$groups = array_unique((array) $groups);
$limit = min(5000, $limit);
$conds = ['ug_group' => $groups];
if ($after !== null) {
$conds[] = 'ug_user > ' . (int) $after;
}
$dbr = wfGetDB(DB_REPLICA);
$ids = $dbr->selectFieldValues('user_groups', 'ug_user', $conds, __METHOD__, ['DISTINCT' => true, 'ORDER BY' => 'ug_user', 'LIMIT' => $limit]) ?: [];
return UserArray::newFromIDs($ids);
}
