任意格式文件下载

支持任意格式的文件下载
函数有两个参数，第一个参数是文件在服务器中完成路径，第二个参数是下载显示文件名称。

1. /**
2. * 下载文件
3. * filename 不包括后缀名
4. */
5. public function download($_path, $filename = '') {
6. if (file_exists($_path)) {
7. $fullPath = CHtml::decode($_path);
8. $filename = $filename ? $filename : substr(strrchr($fullPath, '/'), 1);
9. // Parse Info / Get Extension
10. $fsize = filesize($fullPath);
11. $path_parts = pathinfo($fullPath);
12. $ext = strtolower($path_parts["extension"]);
14. $filename .= '.' . $ext;
16. // Determine Content Type
17. switch ($ext) {
18. case 'apk':
19. $ctype = 'application/vnd.android.package-archive';
20. break;
21. case 'chm':
22. $ctype = 'application/octet-stream';
23. break;
24. case "pdf":
25. $ctype = "application/pdf";
26. break;
27. case "txt":
28. $ctype = "application/txt";
29. break;
30. case "zip":
31. $ctype = "application/zip";
32. break;
33. case "doc":
34. $ctype = "application/msword";
35. break;
36. case "xls":
37. $ctype = "application/vnd.ms-excel";
38. break;
39. case "ppt":
40. $ctype = "application/vnd.ms-powerpoint";
41. break;
42. case "gif":
43. $ctype = "image/gif";
44. break;
45. case "png":
46. $ctype = "image/png";
47. break;
48. case "jpeg":
49. case "jpg":
50. $ctype = "image/jpg";
51. break;
52. default:
53. $ctype = "application/force-download";
54. }
56. $ua = $_SERVER["HTTP_USER_AGENT"];
57. $encoded_filename = rawurlencode($filename);
58. $encoded_filename = str_replace("+", "%20", $encoded_filename);
61. header("Pragma: public"); // required
62. header("Expires: 0");
63. header("Cache-Control: must-revalidate, post-check=0, pre-check=0");
64. header("Cache-Control: private", false); // required for certain browsers
65. header("Content-Type: $ctype");
66. // header('Content-Disposition: attachment; filename="'.rawurlencode($filename).'"');
68. if (preg_match("/MSIE/", $ua)) {
69. header('Content-Disposition: attachment; filename="' . $encoded_filename . '"');
70. } else if (preg_match("/Firefox/", $ua)) {
71. header("Content-Disposition: attachment; filename*=utf8''" . $filename . '"');
72. } else {
73. header('Content-Disposition: attachment; filename="' . $filename . '"');
74. }
76. header("Content-Transfer-Encoding: binary");
77. header("Content-Length: " . $fsize);
78. ob_clean();
79. flush();
80. readfile($fullPath);
81. } else {
82. throw new Exception('文件不存在！', 1);
83. }
84. }

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