下载生成的 excel 仅适用于本地 | WordPress

如何解决下载生成的 excel 仅适用于本地 | WordPress

我有一个 wordpress 页面，将报告显示为 html 表格，点击按钮后，该报告应下载为 xlsx 文件。

问题是，虽然下载功能在我的本地机器上运行良好，但在服务器上，我在屏幕上出现这样的乱码，而不是文件下载：

PKǂ�RG�D�Z�[Content_Types].xml��N ...

相关代码如下：

page-export.PHP

<?PHP

require_once 'vendor/autoload.PHP';
global $wpdb;

use PHPOffice\PHPSpreadsheet\Spreadsheet;
use PHPOffice\PHPSpreadsheet\Writer\Xlsx;
use PHPOffice\PHPSpreadsheet\IOFactory;

if ( !post_password_required() ):

  // fetching data
  $query = "SELECT *,(SELECT COUNT(*) FROM library_Votes
                  WHERE libraries.id = library_Votes.library_id) AS Votes
          FROM libraries ORDER BY Votes DESC";
  $libraries = $wpdb->get_results ( $query );

  // download on click
  if(isset($_GET['action']) && $_GET['action'] == 'download') {
    $header = ['Col1','Col2','ColN];
    $libArray = json_decode(json_encode($libraries),true);
    array_unshift($libArray,$header);
    array_columns_delete($libArray,['ID']);

    // BUILD EXCEL FILE!
    outputXlsx($libArray,'excel_filename','sheetname');
    exit();
  }
?>

// download btn
<a href="<?PHP echo esc_url(get_permalink())?>?action=download" class="btn btn-secondary btn-lg" tabindex="-1" role="button" aria-disabled="true">Download</a>

// loop & html for table
...

<?PHP 

else:
  echo get_the_password_form();
endif;
?>

functions.PHP

function outputXlsx($array,$filename = 'zones',$title = 'Sheet',$debug = false) {

  if (!$debug) {
      header('Content-Type: application/vnd.ms-excel');
      header('Content-disposition: attachment;filename="'. $filename .'.xlsx"');
      header('Cache-Control: max-age=0');
  }

  $spreadsheet = new \PHPOffice\PHPSpreadsheet\Spreadsheet();
  $spreadsheet->setActiveSheetIndex(0);
  $spreadsheet->getActiveSheet()->fromArray($array,NULL,'A1');
  $spreadsheet->getActiveSheet()->setTitle($title);

  ob_end_clean();
  $writer = \PHPOffice\PHPSpreadsheet\IOFactory::createWriter($spreadsheet,'Xlsx');
  $writer->save('PHP://output');   
}

我尝试在类似问题上添加额外的标题，切换 ob_end_clean()，在 outputXlsx 之后退出函数......等，但它仍然只能在本地工作。

提前致谢！

解决方法

我终于修好了！

在 wordpress 中启用调试模式给了我解决这两个警告的线索：

警告：无法修改标头信息 - 标头已发送
ob_end_clean()：删除缓冲区失败。没有要删除的缓冲区

事实证明，我所要做的就是将生成 excel 的代码放在页面顶部的 html 之前，并添加 ob_start()。

页面导出.php：

//line 1 of the file
<?php
      ob_start(); // create buffer fo ob_end_clean()
      require_once 'vendor/autoload.php';
      global $wpdb;

      use PhpOffice\PhpSpreadsheet\Spreadsheet;
      use PhpOffice\PhpSpreadsheet\Writer\Xlsx;
      use PhpOffice\PhpSpreadsheet\IOFactory;
      if ( !post_password_required() ):
      $query = "SELECT *,(SELECT COUNT(*) FROM library_votes
                        WHERE libraries.id = library_votes.library_id) AS votes
                FROM libraries ORDER BY votes DESC";
      $libraries = $wpdb->get_results ( $query );

      if(isset($_GET['action']) && $_GET['action'] == 'download') {
          $header = ['Col1','Col2','ColN'];
          $libArray = json_decode(json_encode($libraries),true);
          array_unshift($libArray,$header);
          array_columns_delete($libArray,['ID']);
          outputXlsx($libArray,'filename','sheetname');
          exit();
      }
?>

// html after
<html>...