2

当使用 PHP 脚本强制下载时，我有一个格式化的 TXT 文件，它正在丢失格式，如果有其他方法可以这样做，请告诉我。

请在下面找到 download.php 脚本文件：

<?php

function output_file($file, $name, $mime_type='')
{
 /*
 This function takes a path to a file to output ($file),  the filename that the browser     will see ($name) and  the MIME type of the file ($mime_type, optional).
 */

 //Check the file premission
 if(!is_readable($file)) die('File not found or inaccessible!');

 $size = filesize($file);
 $name = rawurldecode($name);

 /* Figure out the MIME type | Check in array */
 $known_mime_types=array(
    "pdf" => "application/pdf",
    "txt" => "text/plain",
    "html" => "text/html",
    "htm" => "text/html",
"exe" => "application/octet-stream",
"zip" => "application/zip",
"doc" => "application/msword",
"xls" => "application/vnd.ms-excel",
"ppt" => "application/vnd.ms-powerpoint",
"gif" => "image/gif",
"png" => "image/png",
"jpeg"=> "image/jpg",
"jpg" =>  "image/jpg",
"php" => "text/plain"
 );

 if($mime_type==''){
     $file_extension = strtolower(substr(strrchr($file,"."),1));
 if(array_key_exists($file_extension, $known_mime_types)){
    $mime_type=$known_mime_types[$file_extension];
 } else {
    $mime_type="application/force-download";
 };
 };

 //turn off output buffering to decrease cpu usage
 @ob_end_clean();

 // required for IE, otherwise Content-Disposition may be ignored
 if(ini_get('zlib.output_compression'))
  ini_set('zlib.output_compression', 'Off');

 header('Content-Type: ' . $mime_type);
 header('Content-Disposition: attachment; filename="'.$name.'"');
 header("Content-Transfer-Encoding: binary");
 header('Accept-Ranges: bytes');

 /* The three lines below basically make the
    download non-cacheable */
 header("Cache-control: private");
 header('Pragma: private');
 header("Expires: Mon, 26 Jul 1997 05:00:00 GMT");

 // multipart-download and download resuming support
 if(isset($_SERVER['HTTP_RANGE']))
 {
list($a, $range) = explode("=",$_SERVER['HTTP_RANGE'],2);
list($range) = explode(",",$range,2);
list($range, $range_end) = explode("-", $range);
$range=intval($range);
if(!$range_end) {
    $range_end=$size-1;
} else {
    $range_end=intval($range_end);
}

$new_length = $range_end-$range+1;
header("HTTP/1.1 206 Partial Content");
header("Content-Length: $new_length");
header("Content-Range: bytes $range-$range_end/$size");
 } else {
$new_length=$size;
header("Content-Length: ".$size);
 }

 /* Will output the file itself */
 $chunksize = 1*(1024*1024); //you may want to change this
 $bytes_send = 0;
 if ($file = fopen($file, 'r'))
 {
if(isset($_SERVER['HTTP_RANGE']))
fseek($file, $range);

while(!feof($file) &&
    (!connection_aborted()) &&
    ($bytes_send<$new_length)
      )
{
    $buffer = fread($file, $chunksize);
    print($buffer); //echo($buffer); // can also possible
    flush();
    $bytes_send += strlen($buffer);
}
 fclose($file);
 } else
 //If no permissiion
 die('Error - can not open file.');
 //die
die();
}
//Set the time out
set_time_limit(0);

//path to the file
$file_path=$_REQUEST['filename'];


//Call the download function with file path,file name and file type
output_file($file_path, ''.$_REQUEST['filename'].'', 'text/plain');

?>

HTML 文件：

<html>
<head>
<title></title>

</head>
<body>


<CENTER> <a href='download.php?filename=testFile.txt'>Download print file </a>     </center><br>
</body>
</html>
4

1 回答 1

0

Mime application/force-download，通常表示为 mime application/x-force-download，通常与 PHP 代码结合使用以触发下载框，而不是用于在 Web 浏览器中显示内容。

例如，如果您的网站上有一个文件希望用户下载而不是在 Web 浏览器中查看，您可以在文件的标题内容类型字段中输入适当的 mime 应用程序/强制下载代码。请注意，mime application/force-download 不是已注册的 MIME 类型。此外，在 PHP 代码中使用时，mime application/force-download 的首选拼写包含“x-”前缀。

还有其他强制下载的方法，包括使用 content-disposition 参数将文件标识为附件。许多 PHP 脚本在 if/else 语句中包含 mime application/force-download 以强制下载通常显示在 Web 浏览器中的特定文件类型，例如 PDF 文件和图像文件。

但是，由于应用程序/强制下载未在 Internet 号码分配机构注册，因此并非所有 Web 浏览器都可以识别它，这会导致计算机用户端出现错误。

于 2012-05-10T12:17:05.617 回答