PHP调用数据库数据输出结果总重复一次

求助：PHP调用数据库数据输出结果总重复一次。
表里有两条内容：
1111111111111111111111111
2222222222222222222222222

PHP code

<!--Code highlighting produced by Actipro CodeHighlighter (freeware)http://www.CodeHighlighter.com/--><?php //设置数据库变量$db_host   = 'localhost';$db_user   = 'root';$db_passw = '123456';$db_name  = 'freebb';$conn = mysql_connect($db_host,$db_user,$db_passw) or die ('数据库连接失败！');mysql_query("set names 'utf8'");mysql_select_db($db_name,$conn) or die('数据库选定失败！');$sql = "SELECT * FROM `member` ORDER BY `id` DESC LIMIT 0, 16";$result = mysql_query($sql) or die('数据库查询失败！');  while($mem = mysql_fetch_object($result)) //循环开始{    $username = $mem->username;      $bbsname = $mem->bbsname;    $bbstype = $mem->bbstype;?>              

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