错误：从服务器收到重复的标头

Question

在chrome，opera，safari中发生了Dublicate错误，只能在firefox上运行。 这是标题：

| Header
    | Forcing a download using readfile()
    |----------------
    */

    header('Content-Description: File Transfer');
    header('Content-Type: ' . $file_mime_type);
    header('Content-Disposition: attachment; filename=' . $file);
    header('Content-Transfer-Encoding: binary');
    header('Expires: 0');
    header('Cache-Control: must-revalidate, post-check=0, pre-check=0');
    header('Pragma: public');
    header('Content-Length: ' . $file_size);
    ob_clean();
    flush();
    readfile($file_path);
    exit;

我试图使用双引号和作品，但添加了文件名 - 例如 - ＆＃39; filename.pdf＆＃39;

header("Content-Disposition: attachment; filename= . '$file'");

Answer 1

解决您需要的问题

// Change this 
header('Content-Disposition: attachment; filename=' . $file);

// To this 
header('Content-Disposition: attachment; filename="'.$file.'"');