织梦cms调用昨天、两天前、某个时间段发布的文章的方法

if($subday > 0)

{

    $ntime = gmmktime(0, 0, 0, gmdate('m'), gmdate('d'), gmdate('Y'));

    $limitday = $ntime - ($subday * 24 * 3600);

    $orwheres[] = " arc.senddate > $limitday ";

}

//时间限制(用于调用最近热门文章、热门评论之类)，这里的时间只能计算到天，否则缓存功能将无效
//当subday=1的时候调用1天内的文章
//当subday=2的时候调用昨天的文章
//当subday=3的时候调用2天前得所有文章
//当subday=7的时候调用7天内得所有文章
  if($subday > 0)
  {
      if($subday == 1)
  {
   $ntime = gmmktime(0, 0, 0, gmdate('m'), gmdate('d'), gmdate('Y'));
   $limitday = $ntime - ($subday * 24 * 3600);
   $orwheres[] = " arc.senddate > $limitday ";
  }
    else if ($subday == 2)
  {  
   $ntime = gmmktime(0, 0, 0, gmdate('m'), gmdate('d'), gmdate('Y'));
   $limitday = $ntime - ($subday * 24 * 3600);
   $lomitday = $ntime;
  $orwheres[] = " arc.senddate < $lomitday && arc.senddate > $limitday";
  }
   else if ($subday == 3)
  {  
   $ntime = gmmktime(0, 0, 0, gmdate('m'), gmdate('d'), gmdate('Y'));
   $limitday = $ntime -($subday * 24 * 3600)+(1*24 * 3600);
   $orwheres[] = " arc.senddate < $limitday ";
  }
   else if ($subday == 7)
  {  
   $ntime = gmmktime(0, 0, 0, gmdate('m'), gmdate('d'), gmdate('Y'));
   $limitday = $ntime - ($subday * 24 * 3600);
   $orwheres[] = " arc.senddate > $limitday ";
  }
  }