$titles                = array('订单号','商品结算码','合同号','供应商名称','专柜','商品名称','商品货号','商品单价','商品总价','供应商结算金额','商品数量','商品促销优惠','平台优惠抵扣','品牌订单优惠抵扣');

//导出准备
ob_get_clean();
ob_start();
echo implode("\t", $titles),"\n";

$currencyModel      = app::get('ectools')->model('currency');
foreach ($lists as $key=>$value) {
    $row                             = array();
    $row['order_id']                = html_entity_decode("".$value['order_id']);
    $row['supplier_num']            = $value['supplier_num'];
    $row['agreement_code']            = $value['agreement_code'];
    $row['supplier_name']            = $value['supplier_name'];
    $row['shoppe_name']                = $value['shoppe_name'];
    $row['name']                    = $value['name'];
    $row['bn']                        = $value['bn'];
    $row['price']                   = $value['price'];
    $row['nums']                    = $value['nums'];
    $row['g_price']                 = $value['g_price'];
    $row['settlement_amount']       = $value['settlement_amount'];
    $row['goods_amount_off']         = $value['goods_amount_off'];
    $row['amount_off']                 = $value['amount_off'];
    $row['brand_amount_off']         = $value['brand_amount_off'];

    echo implode("\t", $row),"\n";
}

header('Content-Disposition: attachment; filename='.$filename);
header('Accept-Ranges:bytes');
header('Content-Length:' . ob_get_length());
header('Content-Type:application/vnd.ms-excel');
ob_end_flush();

header('Content-Type:application/vnd.ms-excel');

header('Content-Type:application/vnd.openxmlformats-officedocument.spreadsheetml.sheet');

$row['order_id']                = html_entity_decode("".$value['order_id']);

<?php
//获取要下载的文件名
$filename = $_GET['filename'];
//设置头信息
header('Content-Disposition:attachment;filename=' . basename($filename));
header('Content-Length:' . filesize($filename));
//读取文件并写入到输出缓冲
readfile($filename);