PHP导出数据为excel表格

/**
* 导出数据为excel表格
*@param $data    一个二维数组,结构如同从数据库查出来的数组
*@param $title   excel的第一行标题,一个数组,如果为空则没有标题
*@param $filename 下载的文件名
*@examlpe
$stu = M ('User');
$arr = $stu -> select();
exportexcel($arr,array('id','账户','密码','昵称'),'文件名!');
*/

function exportexcel($data=array(),$title=array(),$filename='report'){
header("Content-type:application/octet-stream");
header("Accept-Ranges:bytes");
header("Content-type:application/vnd.ms-excel");
header("Content-Disposition:attachment;filename=".$filename.".xls");
header("Pragma: no-cache");
header("Expires: 0");
//导出xls 开始
if (!empty($title)){
foreach ($title as $k => $v) {
$title[$k]=iconv("UTF-8", "GB2312",$v);
}
$title= implode("\t", $title);
echo "$title\n";
}
if (!empty($data)){
foreach($data as $key=>$val){
foreach ($val as $ck => $cv) {
$data[$key][$ck]=iconv("UTF-8", "GB2312", $cv);
}
$data[$key]=implode("\t", $data[$key]);

}
echo implode("\n",$data);
}
}