php 随机显示图片的函数

2. /**
3. * 功能：随机显示图片
4. * Filename : img.php
5. * Usage:
6. *
7. *
8. * Edit: bbs.it-home.org
9. **/
10. if($_GET['folder']){
11. $folder=$_GET['folder'];
12. }else{
13. $folder='/images/';
14. }
15. //存放图片文件的位置
16. $path = $_SERVER['DOCUMENT_ROOT']."/".$folder;
17. $files=array();
18. if ($handle=opendir("$path")) {
19. while(false !== ($file = readdir($handle))) {
20. if ($file != "." && $file != "..") {
21. if(substr($file,-3)=='gif' || substr($file,-3)=='jpg') $files[count($files)] = $file;
22. }
23. }
24. }
25. closedir($handle);
27. $random=rand(0,count($files)-1);
28. if(substr($files[$random],-3)=='gif') header("Content-type: image/gif");
29. elseif(substr($files[$random],-3)=='jpg') header("Content-type: image/jpeg");
30. readfile("$path/$files[$random]");
31. ?>

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