PHP 下载文件脚本（不起作用）

Question

我从未编写过 PHP 下载文件脚本，也没有任何经验，我真的不是专业人士。我从另一个网站获得了您可以在下面看到的代码的 sn-p 并尝试使用它。我了解脚本中写的内容，但我只是没有收到错误消息，或者更确切地说，我不知道如何防止这些错误。

这是 download.php 脚本 - 我已将其放入我的主域下方的 /download/ 文件夹中：

<?php

ignore_user_abort(true);
set_time_limit(0); // disable the time limit for this script

$path = "/downloads/"; // change the path to fit your websites document structure

$dl_file = preg_replace("([^\w\s\d\-_~,;:\[\]\(\).]|[\.]{2,})", '', $_GET['download_file']); // simple file name validation
$dl_file = filter_var($dl_file, FILTER_SANITIZE_URL); // Remove (more) invalid characters
$fullPath = $path.$dl_file;

if ($fd = fopen ($fullPath, "r")) {
$fsize = filesize($fullPath);
$path_parts = pathinfo($fullPath);
$ext = strtolower($path_parts["extension"]);
switch ($ext) {
    case "pdf":
    header("Content-type: application/pdf");
    header("Content-Disposition: attachment; filename=\"".$path_parts["basename"]."\""); // use 'attachment' to force a file download
    break;
    // add more headers for other content types here
    default;
    header("Content-type: application/octet-stream");
    header("Content-Disposition: filename=\"".$path_parts["basename"]."\"");
    break;
}
header("Content-length: $fsize");
header("Cache-control: private"); //use this to open files directly
while(!feof($fd)) {
    $buffer = fread($fd, 2048);
    echo $buffer;
}
}
fclose ($fd);
exit;

现在在 /download/ 文件夹中，其中包含 download.php 我有一个文件夹 /downloads，其中包含应下载的 .pdf。

我在网页上使用的链接是： PHP download file（为什么不显示，包括 4 个空格：

现在点击链接时出现以下错误：

Warning: Cannot set max_execution_time above master value of 30 (tried to set unlimited) in /var/www/xxx/html/download/download.php on line 4

Warning: fopen(/downloads/test.pdf): failed to open stream: No such file or directory in /var/www/xxx/html/download/download.php on line 12

Warning: fclose() expects parameter 1 to be resource, boolean given in /var/www/xxx/html/download/download.php on line 34

如果我对 $path 变量使用绝对路径 (https://www.my-domain.de/downloads/)，我会收到以下错误：

Warning: Cannot set max_execution_time above master value of 30 (tried to set unlimited) in /var/www/xxx/html/download/download.php on line 4

Warning: fopen(): https:// wrapper is disabled in the server configuration by allow_url_fopen=0 in /var/www/xxx/html/download/download.php on line 12

Warning: fopen(https://www.my-domain.de/downloads/test.pdf): failed to open stream: no suitable wrapper could be found in /var/www/xxx/html/download/download.php on line 12

Warning: fclose() expects parameter 1 to be resource, boolean given in /var/www/xxx/html/download/download.php on line 34

感谢您的任何建议！

Answer 1

<?php

ignore_user_abort(true);
//set_time_limit(0); disable the time limit for this script

$path = "downloads/"; // change the path to fit your websites document structure

$dl_file = preg_replace("([^\w\s\d\-_~,;:\[\]\(\).]|[\.]{2,})", '', $_GET['download_file']); // simple file name validation
$dl_file = filter_var($dl_file, FILTER_SANITIZE_URL); // Remove (more) invalid characters
$fullPath = $path.$dl_file;

if ($fd = fopen ($fullPath, "r")) {
$fsize = filesize($fullPath);
$path_parts = pathinfo($fullPath);
$ext = strtolower($path_parts["extension"]);
switch ($ext) {
    case "pdf":
    header("Content-type: application/pdf");
    header("Content-Disposition: attachment; filename=\"".$path_parts["basename"]."\""); // use 'attachment' to force a file download
    break;
    // add more headers for other content types here
    default;
    header("Content-type: application/octet-stream");
    header("Content-Disposition: filename=\"".$path_parts["basename"]."\"");
    break;
}
header("Content-length: $fsize");
header("Cache-control: private"); //use this to open files directly
while(!feof($fd)) {
    $buffer = fread($fd, 2048);
    echo $buffer;
}
}
fclose ($fd);
exit;
?>

试试这个代码 您的服务器可能不允许您设置无限秒的最大执行时间限制。在 php.ini 文件中检查它 相对路径也错了，“https://www.my-domain.de/downloads/”不是路径，是服务器的url