miketwais

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兼容火狐的php下载文件代码 

 1 <?php
 2 /*php官网用户笔记上有例子
 3 网址:us1.php.net/manual/zh/function.header.php
 4 I just made a function to allow a file to 
 5 force-download (for a script to disallow file links from untrusted sites
 6  -- preventing mp3/video leeching on forums), and I realized that a 
 7 script like that could potentially be very dangerous.
 8  
 9 Someone could possibly exploit the script to download sensitive files 
10 from your server, like your index.php or passwords.txt -- so I made this
11  switch statement to both allow for many file types for a download 
12 script, and to prevent certain types from being accessed.
13 */
14 function dl_file($file){
15  
16     //First, see if the file exists
17     if (!is_file($file)) { die("<b>404 File not found!</b>"); }
18  
19     //Gather relevent info about file
20     $len = filesize($file);
21     $filename = basename($file);
22     $file_extension = strtolower(substr(strrchr($filename,"."),1));
23  
24     //This will set the Content-Type to the appropriate setting for the file
25     switch( $file_extension ) {
26           case "pdf": $ctype="application/pdf"; break;
27       case "exe": $ctype="application/octet-stream"; break;
28       case "zip": $ctype="application/zip"; break;
29       case "doc": $ctype="application/msword"; break;
30       case "xls": $ctype="application/vnd.ms-excel"; break;
31       case "ppt": $ctype="application/vnd.ms-powerpoint"; break;
32       case "gif": $ctype="image/gif"; break;
33       case "png": $ctype="image/png"; break;
34       case "jpeg":
35       case "jpg": $ctype="image/jpg"; break;
36       case "mp3": $ctype="audio/mpeg"; break;
37       case "wav": $ctype="audio/x-wav"; break;
38       case "mpeg":
39       case "mpg":
40       case "mpe": $ctype="video/mpeg"; break;
41       case "mov": $ctype="video/quicktime"; break;
42       case "avi": $ctype="video/x-msvideo"; break;
43  
44       //The following are for extensions that shouldn't be downloaded (sensitive stuff, like php files)
45       case "php":
46       case "htm":
47       case "html":
48       case "txt": die("<b>Cannot be used for ". $file_extension ." files!</b>"); break;
49  
50       default: $ctype="application/force-download";
51     }
52  
53     //Begin writing headers
54     header("Pragma: public");
55     header("Expires: 0");
56     header("Cache-Control: must-revalidate, post-check=0, pre-check=0");
57     header("Cache-Control: public"); 
58     header("Content-Description: File Transfer");
59      
60     //Use the switch-generated Content-Type
61     header("Content-Type: $ctype");
62  
63     //Force the download
64     $header="Content-Disposition: attachment; filename=".$filename.";";
65     header($header );
66     header("Content-Transfer-Encoding: binary");
67     header("Content-Length: ".$len);
68     @readfile($file);
69     exit;
70 }
71 //This works in both IE and Firefox.
72 ?>

 

posted @ 2017-01-04 16:22  MasonZhang  阅读(221)  评论(0)    收藏  举报