$where = '';
        if (!is_null($time)) {
            $where = ' WHERE dtime<=' . $time;
        }
        $sql = " select COUNT(id) as total, sector from `" . $this->fzz_table . '` ' . $where;
        $query = $this->Query($sql);

$sectors = $fzz->getCountBySector($now);
$now = time();
foreach ($sectors as $val) {
    $total += $val;
}

    public function getCountBySector($time = null)
    {
        $where = '';
        if (!is_null($time)) {
            $where = ' WHERE dtime<=' . $time;
        }
        $sql = " select COUNT(id) as total, sector from `" . $this->fzz_table . '` ' . $where;
        $query = $this->Query($sql);
        $rt = array();
        while ($row = mysqli_fetch_assoc($query)) {
            $rt['sector_' . $row['sector']] = $row['total'];
        }
        return $rt;
    }