PHP设置HTTP头信息导出Excel报表

<!--?php
header("Content-type: application/vnd.ms-excel; charset=utf-8");
header("Content-Disposition: attachment; filename=excel.xls");
$data  = "分类销售统计\t\n";
$data .= "排名\t产品大类\t销售额（万）\t销售占比\t单品数量\n";
if (EC_CHARSET == 'utf-8')
{
      echo ecs_iconv(EC_CHARSET, 'GB2312', $data);
}
else
{
      echo $data;
}
?-->

说明：字符转换这一步骤根据实际需要可以省略。