PHP实现简单的文件下载通用方法

1. function download_file($file){
2. if(is_file($file)){
3. $length = filesize($file);
4. $type = mime_content_type($file);
5. $showname = ltrim(strrchr($file,'/'),'/');
6. header("Content-Description: File Transfer");
7. header('Content-type: ' . $type);
8. header('Content-Length:' . $length);
9. if (preg_match('/MSIE/', $_SERVER['HTTP_USER_AGENT'])) { //for IE
10. header('Content-Disposition: attachment; filename="' . rawurlencode($showname) . '"');
11. } else {
12. header('Content-Disposition: attachment; filename="' . $showname . '"');
13. }
14. readfile($file);
15. exit;
16. } else {
17. exit('文件已被删除！');
18. }
19. }

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PHP