帝国cms按照小时显示更新数量怎么实现

用帝国cms程序之sql调用12小时：

<?=$empire->gettotal("select count(*) as total from phome_ecms_表 where newstime>UNIX_TIMESTAMP()-24*3600")?>

6小时：

<?=$empire->gettotal("select count(*) as total from phome_ecms_表 where newstime>UNIX_TIMESTAMP()-6*3600")?>