即使我使用 Content-Disposition: inline，PHP 也会强制下载 PDF 文件

如果可能的话，我正在尝试在浏览器中显示 PDF，而且我知道我可以在 Chrome 中执行此操作，这就是我正在测试的版本。问题是，每次我尝试时，它都会提示下载。

我正在使用 PHP 会话，所以我知道发送了一些无关的标头，所以我调用header_remove()重置一切。

我调用这个函数来显示 PDF：

<?php
// For demonstrative purposes
session_start();

if (!isset($_SESSION['auth'])) {
    header('Location: login.php');
    die;
}

/*
 * void viewPDF (Report $report)
 * Outputs the PDF of the report
 */
function viewPDF ($report) {
        // Tell the browser we are going to serve a PDF file.
    $file = dirname(__FILE__).'/../reports/'.$report->id.'.pdf';
        // The location of the PDF
    if (!file_exists($file)) {
        die ('The PDF does not exist.');
            // Somehow the file does not exist.
    }

    header_remove();
        // I'm using PHP sessions, so remove the headers
        // automatically set that might break something.
    header('Content-Disposition: inline;filename='.$report->id.'.pdf');
    header('Content-Transfer-Encoding: binary');
    header('Content-Type: application/pdf');
    header('Content-Length: '.filesize($file));
    readfile($file);
        // Serve the report PDF file from the reports
        // repository.
    die;
        // Any whitespace could corrupt the PDF, so be extra
        // sure nothing else gets printed.
}

// For demonstrative purposes:
$report = new StdClass;
$report->id = 1;
viewPDF($report);
?>

这些是正在发送的标头：

Date: Tue, 08 Oct 2013 18:41:32 GMT
Server: Apache/2.2.22 (Win32) PHP/5.4.15
Content-Type: application/pdf
Content-Transfer-Encoding: binary
Content-Disposition: inline;filename=1.pdf
Connection: Keep-Alive
Keep-Alive: timeout=5, max=100
Content-Length: 73464

但它仍然提示下载。下载后，我可以在 Adob​​e Reader 中打开它。

我错过了什么吗？

Thanks.

这段代码对我有用：

    header('Content-Description: File Transfer');
    header('Content-Type: application/pdf');
    header('Content-Disposition: inline; filename="' . basename($file).'"');
    header('Content-Transfer-Encoding: binary');
    header('Expires: 0');
    header('Cache-Control: must-revalidate');
    header('Pragma: public');
    header('Content-Length: ' . filesize($file));
    ob_clean();
    flush();
    readfile($file);