下载生成的 excel 只能在本地使用 | WordPress的

Question

我有一个 word press 页面，将报告显示为 html table，单击按钮后，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，我在屏幕上看到这样的乱码，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');   
}

我尝试添加额外的 headers 我在类似的问题上发现，切换 ob_end_clean()，在 outputXlsx 之后退出函数...等等，但它仍然只能在本地工作。

提前致谢！

Answer 1

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 header 信息 - header 已发送
ob_end_clean(): 删除缓冲区失败。没有要删除的缓冲区

原来我要做的就是把生成excel的代码放在页面顶部html之前，加上ob_start ().

page-export.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>...

下载生成的 excel 只能在本地使用 | WordPress的

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export-to-excel

phpspreadsheet

phpoffice-phpspreadsheet