文件损坏时点击下载链接 [英] file corrupt when click download link

问题描述

我尝试使用php强制图片jpg文件下载，我已经实现了以下代码：

html

 < a href =filedownload.php？src = uploads / myimage.jpg& download = true>下载此档案< / a> 
  

download.php

 < ？php 
 ob_start（）; 
 include_once'functions.php'; 
 
 if（isset（$ _ GET ['download']）&& $ _GET ['download '] =='true'）
 {
 
 $ src = sanitizeString（$ _ GET ['src']）; 
 header（'Content-Description：File Transfer'） ; 
 header（'Content-Type：image / jpeg'）; 
 header（'Content-Disposition：attachment; filename ='。basename（$ src））; 
 header（'Content （''Expires：0'）; 
 header（'Cache-Control：public'）; 
 header（'Pragma：public'）; 
 header（'Expires：0'）; 
 
 
 $ b $> 
  

假设该图片的完整路径是www.example.com/smith/topic/uploads/myimage.jpg，我已经收到了正确的图片名称，并且下载窗口也出现了，但是图片已损坏，并且大小为1KB，任何人都可以告诉我为什么，非常感谢。

解决方案

这里是你的例子如何使用readfile函数

 <？php 
 $ file ='monkey.gif'; 
 
 if（file_exists（$ file））{
 header（'Content-Description：File Transfer'）; 
 header（'Content-Type：application / octet-stream'）; 
 header（'Content-Disposition：attachment; filename ='。basename（$ 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：'。filesize（$ file））; 
 ob_clean（）; 
 flush（）; 
 readfile（$ file）; 
出口; 
} 
？> 
  

I try to use php to force the image jpg file download, I have implemented eth following code:

html

<a href = "filedownload.php?src=uploads/myimage.jpg&download=true>download this file</a>

download.php

 <?php
ob_start();
 include_once 'functions.php';

if (isset($_GET['download']) && $_GET['download'] == 'true')
  {    

  $src = sanitizeString($_GET['src']);
  header('Content-Description: File Transfer');   
  header('Content-Type: image/jpeg');  
  header('Content-Disposition: attachment; filename='.basename($src));  
  header('Content-Transfer-Encoding: binary');  
  header('Expires: 0');   
  header('Cache-Control: public');  
  header('Pragma: public');

  } 

 ?>

Suppose the full path of the image is "www.example.com/smith/topic/uploads/myimage.jpg", I have recieved the right image name and the download window is appeared as well, but the image is corrupt and with 1KB size, any one could tell me why, thanks a lot.

解决方案

Here you are example how to use readfile function

<?php
$file = 'monkey.gif';

if (file_exists($file)) {
    header('Content-Description: File Transfer');
    header('Content-Type: application/octet-stream');
    header('Content-Disposition: attachment; filename='.basename($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: ' . filesize($file));
    ob_clean();
    flush();
    readfile($file);
    exit;
}
?>

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