php处理文件下载的代码

用在服务器上提供下载的php代码，可以指定被下载的文件名，可以动态指定文件内容

1. // local file that should be send to the client
2. $local_file = 'test.zip';
3. // filename that the user gets as default
4. $download_file = 'your-download-name.zip';
6. if(file_exists($local_file) && is_file($local_file)) {
7. // send headers
8. header('Cache-control: private');
9. header('Content-Type: application/octet-stream');
10. header('Content-Length: '.filesize($local_file));
11. header('Content-Disposition: filename='.$download_file);
13. // flush content
14. flush();
16. /*
17. ** You can also remove the following part and
18. ** replace it trough a database command fetching
19. ** the download data
20. */
21. // open file stream
22. $file = fopen($local_file, "rb");
24. // send the file to the browser
25. print fread ($file, filesize($local_file));
27. // close file stream
28. fclose($file);}
29. else {
30. die('Error: The file '.$local_file.' does not exist!');
31. }

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