php实现文件下载(多种文件格式)的代码

3. /**

4. * 文件下载
5. * 多种文件格式，包括pdf、zip、gif、jpg、mpeg、word等。
6. * edit bbs.it-home.org
7. */
8. function dl_file($file){
9. //First, see if the file exists
10. if (!is_file($file)) { die("404 File not found!"); }

11. //Gather relevent info about file

12. $len = filesize($file);
13. $filename = basename($file);
14. $file_extension = strtolower(substr(strrchr($filename,"."),1));

15. //This will set the Content-Type to the appropriate setting for the file

16. switch( $file_extension ) {
17. case "pdf": $ctype="application/pdf"; break;
18. case "exe": $ctype="application/octet-stream"; break;
19. case "zip": $ctype="application/zip"; break;
20. case "doc": $ctype="application/msword"; break;
21. case "xls": $ctype="application/vnd.ms-excel"; break;
22. case "ppt": $ctype="application/vnd.ms-powerpoint"; break;
23. case "gif": $ctype="image/gif"; break;
24. case "png": $ctype="image/png"; break;
25. case "jpeg":
26. case "jpg": $ctype="image/jpg"; break;
27. case "mp3": $ctype="audio/mpeg"; break;
28. case "wav": $ctype="audio/x-wav"; break;
29. case "mpeg":
30. case "mpg":
31. case "mpe": $ctype="video/mpeg"; break;
32. case "mov": $ctype="video/quicktime"; break;
33. case "avi": $ctype="video/x-msvideo"; break;

34. //The following are for extensions that shouldn't be downloaded (sensitive stuff, like php files)

35. case "php":
36. case "htm":
37. case "html":
38. case "txt": die("Cannot be used for ". $file_extension ." files!"); break;

39. default: $ctype="application/force-download";

40. }

41. //Begin writing headers

42. header("Pragma: public");
43. header("Expires: 0");
44. header("Cache-Control: must-revalidate, post-check=0, pre-check=0");
45. header("Cache-Control: public");
46. header("Content-Description: File Transfer");
48. //Use the switch-generated Content-Type
49. header("Content-Type: $ctype");

50. //Force the download

51. $header="Content-Disposition: attachment; filename=".$filename.";";
52. header($header );
53. header("Content-Transfer-Encoding: binary");
54. header("Content-Length: ".$len);
55. @readfile($file);
56. exit;
57. }
58. ?>

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