destoon产品总数，求购总数，供应总数的标注显示
第一步：在include/global.func.php建立table_counts函数//$table 表明 例如：供应表sell 求购表buy 新闻表：article_21
//$where 条件 例如：status=3 最近一月发布的：status=3 and addtime>=".strtotime('-1 month')."
function table_counts($table,$where){
global $db,$DT_PRE;
$count=$db->get_one("select count(*) as num from $DT_PRE$table where $where");
return $count['num'];
第二步：根据参数调用总数的显示，以下代码是在模板页面添加的。
供应总数：{table_counts('sell','status=3')}
本月供应总数：{table_counts('sell',"status=3 and addtime>=".strtotime('-1 month')."")}
求购总数：{table_counts('buy','status=3')}
本月求购总数：{table_counts('buy',"status=3 and addtime>=".strtotime('-1 month')."")}
新闻总数：{table_counts('article_21','status=3')}
本月求购总数：{table_counts('article_21,"status=3 and addtime>=".strtotime('-1 month')."")}
要调用其他的表数据同理，只需要修改下参数即可。
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