PHP: scandir() is too slow

Question

I have to make a function that lists all subfolders into a folder. I have a no-file filter, but the function uses scandir() for listing. That makes the application very slow

Answer 1

Don't write your own. PHP has a Recursive Directory Iterator built specifically for this:

http://php.net/manual/en/class.recursivedirectoryiterator.php

As a rule of thumb (aka not 100% of the time), since it's implemented in straight C, anything you build in PHP is going to be slower.