解决数据库为gb2312,程序显示为utf-8乱码的问题

mysql_query("SET NAMES gb2312");                //将字符集设为utf-8
    $sql="select department from department";
    $result=mysql_query($sql);
    if($result)
    echo" successful!";
    while($row=mysql_fetch_array($result))
    {
        $bm=$row['department'];
        var_dump($row);
        echo '<option >'.iconv('gb2312','utf-8',$bm).'</option>';//这段是关键
    }