php输出excel格式的有关问题

<?php@$con = mysql_connect("localhost","root","mysql");mysql_query('set names gb2312');if (!$con){    die("数据库链接失败:".mysql_error());    exit;}$data = mysql_select_db("berecord",$con);//include('conn.php');//mysql_query('set names gb2312');if(!$data){    echo mysql_error();    mysql_close($con); //关闭数据库链接    exit;}else if($name=="" && $carnumber=="" && $do=="" &&  $usercode==""){    //当四项数据全为空时$sql = "select * from record;  $result = mysql_query($sql,$con);$fp = fopen("php://output","a");$head = array("年","月","日","周","姓名","年龄","班级","学号","上/下学时间","学习记录","体育成绩","学习汇报","学习总结")";foreach($head as $i => $v){    $head[$i] = iconv('utf-8','gb2312',$v);    //格式转换    //$head[$i] = mb_convert_encoding("$v","utf-8","gb2312");}fputcsv($fp,$head);while($row = mysql_fetch_array($result,MYSQL_ASSOC)){    //fputcsv($fp,array_map('zero_change',$row));    fputcsv($fp,$row);    //echo "<br>"; 没有必要 在$row输出时就实现了}mysql_close($con);}?>