php分页之后求某一字段整个字段的总和

各位亲，我现在做一个while循环的列表，现在从网上找到了一个方法，但是只能求出分页后这一页的和，而我想求这个字段所有的和，怎么求呢？
按搜索条件

下图就是求出来之后本页的和


下面就是我的部分php代码

echo "<center>" ;

echo "<form action ='../huwai/sou.php?action=del' method='POST' onSubmit='return confirm(\'你确定要删除这些纪录吗？\')'>" ;

echo "<table cellspacing='0' cellpadding='2' border='1' bordercolor='#66FF66' width='1400px'>" ;

echo "<tr bgcolor='#FFFFCC' align='center' height='20px'>" ;

echo "<th width='50px'><strong>ID号</strong></th>" ;

echo "<th><strong>日期</strong></th>" ;

echo "<th width='50px'><strong>编号</strong></th>" ;

echo "<th width='50px'><strong>县区</strong></th>" ;

echo "<th width='400px'><strong>具体地址</strong></th>" ;

echo "<th width='50px'><strong>科室</strong></th>" ;

echo "<th width='50px'><strong>姓名</strong></th>" ;

echo "<th width='60px'><strong>联系电话</strong></th>" ;

echo "<th width='30px'><strong>油</strong></th>" ;

echo "<th width='30px'><strong>米</strong></th>" ;

echo "<th width='30px'><strong>围裙</strong></th>" ;

echo "<th width='30px'><strong>现金</strong></th>" ;

echo "<th width='50px'><strong>皮革抽纸盒</strong></th>" ;

echo "<th width='50px'><strong>水宜生杯子</strong></th>" ;

echo "<th width='50px'><strong>三件套水杯</strong></th>" ;

echo "<th width='30px'><strong>高</strong></th>" ;

echo "<th width='30px'><strong>长</strong></th>" ;

echo "<th width='30px'><strong>面积</strong></th>" ;

echo "<th width='30px'><strong>安装结果</strong></th>" ;

echo "<th width='300px'><strong>备注</strong></th>" ;

echo "<th width='20px'><strong>结账状态</strong></th>" ;

echo "<th colspan='3' align='center'></th>" ;

echo "</tr>" ;



$num=8;

$sql1="select * from place {$where}";

$result1=mysql_query($sql1);

$total=mysql_num_rows($result1);

$page=new Page($total,$num,$args);

$sql="select id,time,number,xianqu,address,keshi,name,tel,you,mi,weiqun,money,pgczh,beizi,sjtsb,high,width,area,azjg,bz,jzzt from place {$where} order by `id` DESC {$page->limit}";

$result=mysql_query($sql);

while(list($id,$time,$number,$xianqu,$address,$keshi,$name,$tel,$you,$mi,$weiqun,$money,$pgczh,$beizi,$sjtsb,$high,$width,$area,$azjg,$bz,$jzzt)=mysql_fetch_row($result)){

echo "<tr>";

echo "<td>$id</td>";

echo "<td>$time</td>";

echo "<td class='number'>$number</td>";

echo "<td>$xianqu</td>";

echo "<td>$address</td>";

echo "<td>$keshi</td>";

echo "<td>$name</td>";

echo "<td>$tel</td>";

echo "<td>$you</td>";

echo "<td>$mi</td>";

echo "<td>$weiqun</td>";

echo "<td>$money</td>";

echo "<td>$pgczh</td>";

echo "<td>$beizi</td>";

echo "<td>$sjtsb</td>";

echo "<td>$high</td>";

echo "<td>$width</td>";

echo "<td>$area</td>";

echo "<td>$azjg</td>";

echo "<td>$bz</td>";

echo "<td>$jzzt</td>";

echo "<td><a href='../huwai/huwaimod.php?action=mod&id=$id'>修改</a></td>";

echo "<td><a href='../huwai/sou.php?action=del&id=$id' onclick='return confirm('确定要删除?')'>删除</a></td>";

echo "<td><input type='checkbox' name='id[ ]' value ='$id' ></td>";

echo "</tr>";

$totalarea += $area;

}



echo "<tr><td colspan='21' align='center'><span class='fenye'><ul class='fr'> {$page->fpage(array(1,8,2,3,4,5,6,7,0))}</ul></span></td><td colspan='3' align='center'><input type='submit' name='dosubmit' value='删除'/></td></tr>";

echo "<tr><td colspan='24' align='center'>总面积<本页合计>: ".$totalarea." 平方米(按搜索条件计算)</td></tr>";

echo "</table>";

echo "</form>";

echo "</center>";

我现在呢？就是想求出搜索出来之后，$area 这个字段所有相加的和!
有高手帮忙分享解决办法吧，谢谢！