User::parseRealUsers

static function parseRealUsers(array $userIds): array
{
	$realUserIds = [];

	foreach ($userIds as $key => $value)
	{
		if (preg_match('/^[1-9][0-9]*$/', $value))
		{
			$realUserIds[] = (int)$value;
		}
	}

	return $realUserIds;
}