add file in folders with PHP
<p>I have more than 100 folders with subfolders ... </p>

<p>example:</p>

<pre>

a/b/c/d/e
f/g/h
m/n
k/l/o/p/s/z/x/

....
</pre>

<p>I want to added a blank file (index.html) to each folder (and each subfolder). 
Could I do that with PHP? And How?</p>
