DiscuzX的顶部的格式广告的列数，是再3，4，5之间自动变化的.

具体的代码位于:

source/class/adv/adv_text.php, 从97行开始:

 
$advcount = count($adids);
if($advcount > 5) {
		$minfillpercent = 0;
		for($cols = 5; $cols >= 5; $cols--) {
			if(($remainder = $advcount % $cols) == 0) {
				$advcols = $cols;
			break;
		} elseif($remainder / $cols > $minfillpercent)  {
			$minfillpercent = $remainder / $cols;
			$advcols = $cols;
		}
	}
} else {
	$advcols = $advcount;
	}