PHP下载脚本错误加载PDF文档失败

Question

我有一个简单的下载脚本，可以在下面找到：if (isset($_GET['name'])){        $name = $_GET['name'];        $stmt = $conn->prepare("SELECT link_to_policy FROM policies WHERE name = ? LIMIT 1");        $stmt->bind_param('s', $name);        $stmt->execute();        $result = $stmt->get_result();        $result2 = $result->fetch_assoc();        $policytodownload = $result2["link_to_policy"];        if (file_exists($policytodownload)) {            header("Content-Type: application/vnd.openxmlformats-officedocument.wordprocessingml.document");            header("Content-Type: application/msword");            header("Content-Type: application/pdf");            header('Content-Disposition: attachment');            header("Cache-Control: no-cache");            header('Content-Length: ' . filesize($policytodownload));            ob_clean();            flush();            readfile($policytodownload);            exit;        }       }   link_to_policy 列包含保存策略的文件的完整路径。点击链接后，文件被下载，但点击文件后，即使是word文档，我在Chrome中收到错误信息（所有PDF文件都是在那里打开的）：Failed to load PDF文档。你能帮我么？谢谢！

Answer 1

不要发送多个Content-type标头，发送文件扩展名的适当类型。

if (isset($_GET['name'])){

    $name = $_GET['name'];

    $stmt = $conn->prepare("SELECT link_to_policy FROM policies WHERE name = ? LIMIT 1");

    $stmt->bind_param('s', $name);

    $stmt->execute();

    $result = $stmt->get_result();

    $result2 = $result->fetch_assoc();

    $policytodownload = $result2["link_to_policy"];

    if (file_exists($policytodownload)) {

        $type_map = ['xls' => 'application/vnd.openxmlformats-officedocument.wordprocessingml.document',

                     'doc' => 'application/msword',

                     'pdf' => 'application/pdf'];

        $ext = pathinfo($policytodownload, PATHINFO_EXTENSION);

        if (isset($type_map[$ext])) {

            header("Content-Type: {$type_map[$ext]}");

        }

        header("Cache-Control: no-cache");

        header('Content-Length: ' . filesize($policytodownload));

        ob_clean();

        flush();

        readfile($policytodownload);

        exit;

    }   

}