PHP Recursive Functions: How to Write Them, and Why They're Useful

Recursion Example #2: Reading a Tree of Files and Folders

Contents of 'photos':

bob.jpg
family/
- william/
  - swings.jpg
  - william-at-park.jpg
- zoe/
  - at-the-beach.jpg
  - at-the-zoo.jpg
me.jpg
spain/
- barcelona.jpg
- madrid.jpg
wedding/
- chapel.jpg
- reception.jpg

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