php实现上传与下载文件的一段代码

10. 
    
11. 
    
12. $dir = 'upload/';
    if(is_dir($dir)) {
    if ($dh = opendir($dir)) {
    while (($file = readdir($dh)) !== false) {
    if($file!="." && $file!="..") {
    echo "
    ";
    }
    }
    closedir($dh);
    }
    }
    ?>

    ".$file."

2，上传文件源代码 upload_file.php

3. /**

4. * 文件上传与下载
5. * edit bbs.it-home.org
6. */
7. if ($_FILES["file"]["error"] > 0)
8. {
9. echo "Return Code: " . $_FILES["file"]["error"] . "
   ";
10. }
11. else
12. {
13. echo "Upload: " . $_FILES["file"]["name"] . "
    ";
14. echo "Type: " . $_FILES["file"]["type"] . "
    ";
15. echo "Size: " . ($_FILES["file"]["size"] / 1024) . " Kb
    ";
16. echo "Temp file: " . $_FILES["file"]["tmp_name"] . "
    ";
18. if (file_exists("upload/" . $_FILES["file"]["name"]))
19. {
20. echo $_FILES["file"]["name"] . " already exists. ";
21. }
22. else
23. {
24. move_uploaded_file($_FILES["file"]["tmp_name"],
25. "upload/" . $_FILES["file"]["name"]);
26. echo "Stored in: " . "upload/" . $_FILES["file"]["name"];
27. }
28. }

29. //下载文件

30. header('HTTP/1.1 301 Moved Permanently');
31. header('Location:files.php');
32. ?>