(PHP 5 >= 5.3.0, PHP 7) Retrieve the key for the current file

(PHP 5 >= 5.3.0, PHP 7) The current file public

(PHP 5 >= 5.3.0, PHP 7) Rewinds back to the beginning

(PHP 5 >= 5.3.0, PHP 7) Get the handling flags

(PHP 5 >= 5.3.0, PHP 7) Constructs a new filesystem iterator

(PHP 5 >= 5.3.0, PHP 7) Sets handling flags

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