怎么获取表单的最后一条数据id？

刚学php两天，求教一下

<?php
$con=mysql_connect("localhost","test","a");
mysql_select_db("voice",$con);

$result=mysql_query("SELECT* FROM list WHERE voice_id= ");
while($row=mysql_fetch_array($result)){
echo "<h1>";
echo $row['voice_title'];
echo "</h1>";
echo "<p><span>作者：";
echo $row['article_author'];
echo "</span><span>声音：";
echo $row['voice_author'];
echo "</span></p>";
echo "<p>";
echo $row['voice_file'];
echo "</p>";
echo $row['voice_date'];
}

?>

怎么获取表单的最后一条数据id？