php读取30天之内的根据算法排序的代码

<?php
$link=mysql_connect("","","")
or die("无法连接到mysql数据库".mysql_error());
mysql_select_db("duyounet",$link);
mysql_query("set names 'gb2312'",$link);
$day30=time()-60*60*24*30;
$result=mysql_query("select articleid,articlename, (allvote*20+goodnum+allvisit) as dxy_px from jieqi_article_article where postdate>$day30 order by dxy_px desc limit 0,14") or die("查询".$database."数据库出错".mysql_error());
$row=mysql_fetch_row($result);
echo "document.writeln(\"<ul class='ultop'>\")".";\r\n";
while ($row){
echo "document.writeln(\"<li><a href='/modules/article/articleinfo.php?id=".$row[0]."' target='_blank'>".$row[1]."(".$row[2].")</a></li>\");\r\n";
$row=mysql_fetch_row($result);

}
mysql_free_result($result);
mysql_close();
echo "document.writeln(\"</ul>\");\r\n"
?>