php随机显示指定文件夹下的所有图片

3. # Init Array
4. $files = array();
5. # Get Folder
6. if($_GET['folder']) {
7. $folder = $_GET['folder'];
8. } else {
9. # Set Default Folder
10. $folder = '/img/';
11. }
12. # Set Full Path
13. $path = $_SERVER['DOCUMENT_ROOT'] . '/' . $folder;
14. # Open Directory
15. if($handle = opendir($path)) {
16. # Loop Through Directory
17. while(false !== ($file = readdir($handle))) {
18. if ($file != "." && $file != "..") {
19. if(substr($file, -3) == 'gif' || substr($file, -3) == 'png' || substr($file, -3) == 'jpg' || substr($file, -4) == 'jpeg') $files[count($files)] = $file;
20. }
21. }
22. }
23. # Close Handle
24. closedir($handle);
25. # Init Random
26. $rand = rand(0, count($files)-1);
27. # Check Header Type
28. # GIF
29. if(substr($files[$random], -3) == 'gif') header("Content-type: image/gif");
30. # JPEG
31. elseif(substr($files[$random], -3) == 'jpg') header("Content-type: image/jpeg");
32. elseif(substr($files[$random], -4) == 'jpeg') header("Content-type: image/jpeg");
33. # PNG
34. elseif(substr($files[$random],-3) == 'png') header("Content-type: image/png");
35. # Read File
36. readfile($path . '/' . $files[$random]);
37. ?>

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