关于php的判断语句,该怎么处理

关于php的判断语句

	$pubdate = $dsql->GetOne("select pubdate from article where writer ='".$writer."' order by id desc limit 1");

	if((time()-$pubdate['pubdate'])<(3600*24)){

		ShowMsg("对不起，一个会员每天只能发一篇文章！","-1","0",5000);

		exit;

	}

以上判断一个会员在一天内只能提交一篇文档，想修改成可以提交3篇，应该怎么做？

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------解决方案--------------------
原代码改为

$n = 1; //你指定的篇数

$pubdate = $dsql->GetOne("select count(*) as cnt from article where FROM_UNIXTIME(pubdate,'%Y%m%d')=DATE_FORMAT(now(),'%Y%m%d') and writer ='".$writer."' order by id desc limit 1");

if($pubdate['pubdate'] > $n){

    ShowMsg("对不起，一个会员每天只能发 $n 篇文章！","-1","0",5000);

    exit;

}