【大数据量导出】 PHP导出上万上百万条数据

直接po代码：

超过5000行用第一段代码，样式不好看，但是导出大数据量基本没问题。

/**
* @Author echo
* @DateTime 2018-11-23
* @description 超过5000行数据用此方法
* @param [array] $export_data [导出的]
* @param [int] $count [导出数据的总行数]
* @return [source] [文件流]
* 例：
* $export_data['filename'] = '测试';
  $export_data['cellName'] = array('编号','姓名','性别');
  $export_data['sql'] = "select name from user"
  );
*/
public static function batchExport($export_data, $count)
{
    set_time_limit(0);
    ini_set('memory_limit', '128M');

    $fileName = $export_data['filename']; //文件名
    $title = $export_data['cellName']; //标题名称
    $sql = $export_data['sql']; //需要拼接的sql
    header('Content-Type: application/vnd.ms-execl');
    header('Content-Disposition: attachment;filename="' . $fileName . '.csv"');

    //打开php标准输出流
    //以写入追加的方式打开
    $fp = fopen('php://output', 'a');

    //一次取5000条数据
    $step = ceil($count/5000);
    foreach($title as $key => $item) {
        $title[$key] = iconv('UTF-8', 'GBK', $item);
    }
    //将标题写到标准输出中
    fputcsv($fp, $title);
    $order = 'sum(ga.num) DESC';
    for($s = 0; $s < $step; $s++) {
        $page_count = $s; 
        $page_size = 5000;
        if ($page_count == $step-1){
            $page_size = $step*5000-$count;
        }
        $data = Db::query($sql, [$page_count, $page_size]);
        foreach ($data as $k => &$v) {
        //避免科学计数法导出数据错误，给每个数据加上\t
        array_walk($v,function (&$s, $k, $prefix = "\t") {
            $s = str_pad($s, strlen($prefix) + strlen($s), $prefix, STR_PAD_LEFT);}
        );
        foreach ($v as $key => &$value) {
        //这里必须转码，不然会乱码
            $v[$key] = iconv('UTF-8', 'GBK', $value);
        }
        fputcsv($fp, $v);
    }
    //每5000条数据就刷新缓冲区
    ob_flush();
    flush();
    }
    return;
}

少于5000行用下面的代码，虽然处理量不大，但是能做出好看的样式

/**
 * [数据导出公共方法]
 * @param [type] $export_data['filename'] [文件名]
 * @param [type] $export_data['data'] [导出数据]
 * @param [type] $export_data['cellName'] [导出字段]
 * 例：
 * $export_data['filename'] = '测试';
    $export_data['data'] = array(
    array('1','miss','男'),
    array('2','echo','女')
    );
    $export_data['cellName'] = array('编号','姓名','性别');
*/
public static function Export($export_data)
{
    //创建一个PHPExcel对象 
    $objPHPExcel = new \PHPExcel(); 
    $startLine = 3; //数据开始的行数第三行，前两行分别为标题、字段
     $cols = count($export_data['data']); //数据条数
    $len = count($export_data['cellName']);//字段数 
    // echo $len;die;
    $cellKey = array(
        'A','B','C','D','E','F','G','H','I','J','K','L','M',
        'N','O','P','Q','R','S','T','U','V','W','X','Y','Z',
        'AA','AB','AC','AD','AE','AF','AG','AH','AI','AJ','AK','AL','AM',
       'AN','AO','AP','AQ','AR','AS','AT','AU','AV','AW','AX','AY','AZ'
    ); 
   $objPHPExcel->getActiveSheet()
   ->getStyle('A1')
   ->getAlignment()
   ->setHorizontal(\PHPExcel_Style_Alignment::HORIZONTAL_CENTER);
   //设置标题文字大小
   $objPHPExcel->getActiveSheet()->getStyle('A1')->getFont()->setSize(15); 
   //写入标题 并给标题、字段加底色 
   for ($i=0; $i < $len; $i++) { 
      //设置每一列宽度
      $objPHPExcel->getActiveSheet()->getColumnDimension($cellKey[$i])->setWidth(15); 
      //设置标题高度
      $objPHPExcel->getActiveSheet()->getDefaultRowDimension($cellKey[$i] . ($startLine-2))->setRowHeight(40);
      //设置字段高度
      $objPHPExcel->getActiveSheet()->getDefaultRowDimension($cellKey[$i] . ($startLine-1))->setRowHeight(25);
      //设置标题颜色
      $objPHPExcel->getActiveSheet()->getStyle($cellKey[$i] . ($startLine-2))->getFill()-                        >setFillType(\PHPExcel_Style_Fill::FILL_SOLID)->getStartColor()->setARGB('FF9CC3E5');
      //设置字段颜色
      $objPHPExcel->getActiveSheet()->getStyle($cellKey[$i] . ($startLine-1))->getFill()->setFillType(\PHPExcel_Style_Fill::FILL_SOLID)->getStartColor()->setARGB('FFBDD7EE'); 
      //写入字段名称 
      $objPHPExcel->setActiveSheetIndex(0)->setCellValue($cellKey[$i] . ($startLine-1), $export_data['cellName'][$i], \PHPExcel_Cell_DataType::TYPE_STRING);
      //设置字段右侧边框
      $objPHPExcel->getActiveSheet()->getStyle($cellKey[$i] . ($startLine-1))->getBorders()->getRight()->setBorderStyle(\PHPExcel_Style_Border::BORDER_THIN);
      } 
      //设置表格样式 (合并单元格) 
      $objPHPExcel->setActiveSheetIndex(0)->setCellValue('A1', $export_data['filename'], \PHPExcel_Cell_DataType::TYPE_STRING);
      $objPHPExcel->getActiveSheet()->mergeCells('A1:'.$cellKey[count($export_data['cellName'])-1].'1'); 
      //冻结标题
      $objPHPExcel->getActiveSheet()->freezePane('A2');
      $objPHPExcel->getActiveSheet()->freezePane('A3');
      //写入数据 
      for ($i=0; $i < $cols; $i++) { 
            // echo $i.'</br>';
            $objPHPExcel->getActiveSheet()->getStyle('A'. ($i+$startLine))->getAlignment()->setHorizontal(\PHPExcel_Style_Alignment::HORIZONTAL_LEFT);
            for ($j = 0; $j < $len; $j++) {
                  $objPHPExcel->setActiveSheetIndex(0)->setCellValue($cellKey[$j] . ($i+$startLine), $export_data['data'][$i][$j].'', \PHPExcel_Cell_DataType::TYPE_STRING);
            }
      } 
      // 文件中的第一个表格的名 
      $objPHPExcel->getActiveSheet()->setTitle($export_data['filename']); // 设置操作的表是第一个表
      $objPHPExcel->setActiveSheetIndex(0); // 直接在浏览器中输出文件(Excel2007) 
      header('Content-Type: application/vnd.openxmlformats-officedocument.spreadsheetml.sheet'); 
      header('Content-Disposition: attachment;filename='.iconv("utf-8","gb2312",$export_data['filename']).'.xlsx'); 
      // If you're serving to IE 9, then the following may be needed 
      header('Cache-Control: max-age=0'); 
      // If you're serving to IE over SSL, then the following may be needed 
      header('Cache-Control: max-age=1'); 
      header ('Expires: Mon, 26 Jul 1997 05:00:00 GMT'); // Date in the past 
      header ('Last-Modified: '.gmdate('D, d M Y H:i:s').' GMT'); // always modified 
      header ('Cache-Control: cache, must-revalidate'); // HTTP/1.1 
      header ('Pragma: public'); // HTTP/1.0 
      $objWriter = \PHPExcel_IOFactory::createWriter($objPHPExcel, 'Excel2007'); 
      $objWriter->save('php://output'); 
      return;
}