(PHP 5 >= 5.1.0, PHP 7) Get the inner iterator

(PHP 5 >= 5.2.0, PHP 7) Sort an array naturally, case insensitive

(PHP 5 >= 5.3.0, PHP 7) Check validity public

(PHP 5 >= 5.1.0, PHP 7) Create a RecursiveFilterIterator from a RecursiveIterator

(PHP 5, PHP 7) Get inode for the current DirectoryIterator item

(PHP 5, PHP 7) Determine if current DirectoryIterator item is a regular file

(PHP 5 >= 5.1.0, PHP 7) Get sub path public

(PHP 5, PHP 7) Determine if current DirectoryIterator item is '.' or '..'

(PHP 5 >= 5.2.0, PHP 7) Get flags public int

(PHP 5 >= 5.3.0, PHP 7) Move to the next file