表中含有下列字段：
id;;;下载的文件的唯一标识
downnum;;点击数
first.php
<?while($myrow = @mysql_fetch_array($result))
{
?>
<TR>
<TD>
<?if(empty($myrow["downnum"])) echo "0"else echo $myrow["downnum"]; ?>;;
</TD>
<TD>
<a;;href="ddload.php?purl=downfileurl&dnnum=<?echo $myrow['downnum'] ?>&id=<?echo $myrow['id']?>">click here download </a>
</TD>
</TR>
<?};?>
;;
ddload.php
<?
;;;;;include("data.inc.php");
;;;;;if($incerror)
;;;;;{
;;;echo $incerror;
;;;exit;
;;;;;}
;;;;;if(empty($dnnum)) $dnnum = 1;
;;;;;else $dnnum ++;
;;;;;$sql = "update book set downnum ='$dnnum' where id =$id"
;;;;;mysql_query($sql);
;;;;;mysql_close($connect);
;;;;;header("location:$purl");
?>
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