无法使用DOMPDF下载pdf

Question

我检查了大量资源，但我的问题无法解决。我尝试通过包含PHP文件生成PDF。但现在我陷入了“无法流式传输pdf：已发送的标头”错误。我也压缩我的代码，并删除空格。 这是我的代码。

<?php
 //ob_start();
// include autoloader
require_once 'dompdf/autoload.inc.php';

// reference the Dompdf namespace
use Dompdf\Dompdf;

// instantiate and use the dompdf class
$dompdf = new Dompdf();
$return = include 'download_pdf.php';
$return = stripslashes($return);
$dompdf->loadHtml($return);

// (Optional) Setup the paper size and orientation
$dompdf->setPaper('A4', 'landscape');

// Render the HTML as PDF
$dompdf->render();

// Output the generated PDF to Browser
//$dompdf->stream();

// Output the generated PDF (1 = download and 0 = preview)
$dompdf->stream("codex",array("Attachment"=>0));
?>

Answer 1

尝试使用output buffering

替换

$return = include 'download_pdf.php';

与

ob_start();
include 'download_pdf.php';
$return  = ob_get_contents();
ob_end_clean();