/**
 * 获得文章总数
 * @param $catid
 * @param $where
 *
 * @return float|string
 * @throws \think\db\exception\DataNotFoundException
 * @throws \think\db\exception\ModelNotFoundException
 * @throws \think\exception\DbException
 */
function articleCount($catid, $where)
{
    $_item = db('category')->where(['id' => $catid])->find();
    $_item = db('model')->where(['id' => $_item['modelid']])->find();

    return db($_item['tablename'])->where($where)->count();
}

            {php}
                $sql='';
                foreach($condition as $k => $v)
                {
                    $sql .= ' and ' . $k . ' = "' . $v . '" ';
                }
                $sql = ' status = 1 ' . $sql . ' ';
            {/php}
            {:articleCount($catid,$sql)}