PHP displays the file where the current file is located and all the files in the folder, and expands it in a tree shape_PHP tutorial

3. $path = "./";
5. function createDir($path = '.')
6. {
7. if ($handle = opendir($path))
8. {
9. echo "
   ";
   • while (false !== ($file = readdir($handle)))
   • {
   • if (is_dir($path.$file) && $file != '.' && $file !='..')
   • printSubDir($file, $path, $queue);
   • else if ($file != '.' && $file !='..')
   • $queue[] = $file;
   • }
   • printQueue($queue, $path);
   • echo "
   ";
10. }
11. }
13. function printQueue($queue, $path)
14. {
15. foreach ($queue as $file)
16. {
17. printFile($file, $path);
18. }
19. }
21. function printFile($file, $path)
22. {
23. echo "
24. $file
";
25. }
27. function printSubDir($dir, $path)
28. {
29. echo "
30. $dir";
31. createDir($path.$dir."/");
32. echo "
";
33. }
35. createDir($path);
36. ?>