无法导出为xml - PHP / 基础编程

PHP code:

/**
* 导出xml文件
*/
class XmlExport extends FileExport{

/**
* 导出文件方法
*/
public function downFile($data){
header('content-Type: text/xml');
header('content-Disposition:attachment;filename='.$this->fileName);
header('Accept-Ranges:bytes');
header('Pragma:no-cache');
header('Expires:0');

if (count($data)<=0){
echo 'No Data !'.chr(13);
}

$content = '<?xml version="1.0" encoding="UTF-8" ?>'.chr(9).chr(13);
foreach ($data as $k => $v){
/**
* 每行的输出数据
*/
$content .= chr(9).'<data>'.chr(13);
foreach($v as $kk => $vv){
$content .= chr(9).chr(9).'<'.$this->changeEncodeToGB2312($kk).'>'
.$this->changeEncodeToGB2312($vv).'<'
.$this->changeEncodeToGB2312($kk).'/>'.chr(13);

}
$content .= chr(9).'</data>'.chr(13);
}

echo $content;
}
}


没有弹出下载对话框，直接把内容显示在浏览器里面了，大家帮忙看看

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问题找到了，自己太粗心。
PHP code

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