Php/docs/dir.constants
From Get docs
Predefined Constants
DIRECTORY_SEPARATOR
(string)PATH_SEPARATOR
(string)- Semicolon on Windows, colon otherwise.
SCANDIR_SORT_ASCENDING
(int)- Available since PHP 5.4.0.
SCANDIR_SORT_DESCENDING
(int)- Available since PHP 5.4.0.
SCANDIR_SORT_NONE
(int)- Available since PHP 5.4.0.