public function export(){
 // 從數(shù)據(jù)庫(kù)中獲取數(shù)據(jù),為了節(jié)省內(nèi)存,不要把數(shù)據(jù)一次性讀到內(nèi)存,從句柄中一行一行讀即可
 // 輸出Excel文件頭,可把user.csv換成你要的文件名
 header('Content-Type: application/vnd.ms-excel');
 header('Content-Disposition: attachment;filename="order.csv"');
 header('Cache-Control: max-age=0');
 $where=array(
   "paid"=>1,
   "pay_type"=>array("NEQ","offline"),
   "status"=>array("lt",3),
 );
 $stmt = M("Group_order")->field("order_id,order_name,num,price,total_money,contact_name,phone,zipcode,adress,wx_cheap,balance_pay,payment_money,tuan_type,pay_time,pay_type,third_id,is_mobile_pay,paid,status")->where($where)->order("order_id DESC")->limit(1000)->select();
   // 打開(kāi)PHP文件句柄,php://output 表示直接輸出到瀏覽器
 $fp = fopen('php://output', 'a');
 // 輸出Excel列名信息
 $head = array("訂單號(hào)","訂單名稱(chēng)","購(gòu)買(mǎi)數(shù)量","單價(jià)","總價(jià)","聯(lián)系人姓名","聯(lián)系人電話(huà)","郵編","詳細(xì)地址","微信優(yōu)惠金額","余額支付金額","真實(shí)支付金額","特賣(mài)類(lèi)型(2為實(shí)物)","支付時(shí)間","支付類(lèi)型","第三方支付id","是否是手機(jī)支付","是否支付","訂單狀態(tài)");
 foreach ($head as $i => $v) {
 // CSV的Excel支持GBK編碼,一定要轉(zhuǎn)換,否則亂碼
   $head[$i] = iconv('utf-8', 'gbk', $v);
 }
 // 將數(shù)據(jù)通過(guò)fputcsv寫(xiě)到文件句柄
 fputcsv($fp, $head);
 // 計(jì)數(shù)器
 $cnt = 0;
 // 每隔$limit行,刷新一下輸出buffer,不要太大,也不要太小
 $limit = 500;
 // 逐行取出數(shù)據(jù),不浪費(fèi)內(nèi)存
 $count = count($stmt);
 for($t=0;$t<$count;$t++) {
 $cnt ++;
 if ($limit == $cnt) { //刷新一下輸出buffer,防止由于數(shù)據(jù)過(guò)多造成問(wèn)題
   ob_flush();
   flush();
   $cnt = 0;
 }
 $row = $stmt[$t];
foreach ($row as $i => $v) {
  if($i=='pay_time'){
     $v=date("Y-m-d,H:i:s",$v);
  }
   $row[$i] = iconv('utf-8', 'gbk', $v);
 }
 fputcsv($fp, $row);
 }
   fclose($fp);
 }