php实现文件下载！

实现php文件安全下载！

1. public function downloads($name){
2. $name_tmp = explode("_",$name);
3. $type = $name_tmp[0];
4. $file_time = explode(".",$name_tmp[3]);
5. $file_time = $file_time[0];
6. $file_date = date("Y/md",$file_time);
7. $file_dir = SITE_PATH."/data/uploads/$type/$file_date/";
9. if (!file_exists($file_dir.$name)){
10. header("Content-type: text/html; charset=utf-8");
11. echo "File not found!";
12. exit;
13. } else {
14. $file = fopen($file_dir.$name,"r");
15. Header("Content-type: application/octet-stream");
16. Header("Accept-Ranges: bytes");
17. Header("Accept-Length: ".filesize($file_dir . $name));
18. Header("Content-Disposition: attachment; filename=".$name);
19. echo fread($file, filesize($file_dir.$name));
20. fclose($file);
21. }
22. }