Question

以下代码显示：

/home/my_site/www/wp-content/uploads/2017/03/2017-03-17-my_file.mp3

据我所知，这条道路是正确的。然而，当我评论echo并下载文件时，它是一个空文件。为什么呢？

代码：

if (isset($_GET['file'])) { 
    clearstatcache();
    $file_path = str_replace('http://www.example.com/', '', $_GET['file']);
    $file_path = $_SERVER['DOCUMENT_ROOT'] . '/' . $file_path . '.mp3';
    echo $file_path;

    if(file_exists($file_path)) {
        $file_name = basename($file_path);
        $file_size = filesize($file_path);
        header("Cache-Control: private");
        header("Content-Type: application/stream");
        header("Content-Length: ".$file_size);
        header("Content-Disposition: attachment; filename=".$file_name);
        exit();
    }
    else {
        die('The provided file path is not valid.');
    }
}

编辑：这是我在KIKO Software的建议之后所拥有的。仍然下载空文件。

<?php
if (isset($_GET['file'])) { 
  $file_path = $_SERVER['DOCUMENT_ROOT'] . '/' . $_GET['file'] . '.mp3';
  //echo $file_path;
  //$file_path = $_SERVER['SCRIPT_FILENAME'];  
  if (file_exists($file_path)) {
    $file_name = basename($file_path);
    $file_size = filesize($file_path);
  header('Content-type: application/octet-stream');
  header('Content-Transfer-Encoding: binary');
  header('Content-Length: '.$file_size);
  header('Content-Disposition: attachment; filename='.$file_name);
  //readfile($file_path);
  exit();
  }
  else {
      die('The provided file path is not valid.');
  }
}
?>

Answer 1

下载文件的简单示例：

$content = 'This is the content.';
$size    = strlen($content);
$name    = 'test.txt';
header('Content-type: application/octet-stream');
header('Content-Transfer-Encoding: binary');
header('Content-Length: '.$size);
header('Content-Disposition: attachment; filename='.$name);
echo $content;

确保首先使用此功能。如果它没有标题可能有问题。启用错误报告并查看：How to fix "Headers already sent" error in PHP

然后建立起来。首先下载脚本本身：

$file_path = $_SERVER['SCRIPT_FILENAME'];  
if (file_exists($file_path)) {
  $file_name = basename($file_path);
  $file_size = filesize($file_path);
  header('Content-type: application/octet-stream');
  header('Content-Transfer-Encoding: binary');
  header('Content-Length: '.$file_size);
  header('Content-Disposition: attachment; filename='.$file_name);
  readfile($file_path);
  exit();
}
else {
  die('The provided file path is not valid.');
}

然后才尝试下载其他内容。

通过逐步解决问题，可以更容易地看出它出错的地方。

PHP：强制下载正在下载一个空文件

1 个答案: