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PHP Manual

# Predefined Constants

The constants below are defined by this extension, and will only be available when the extension has either been compiled into PHP or dynamically loaded at runtime.

`DIRECTORY_SEPARATOR` (string)
`PATH_SEPARATOR` (string)
  Available since PHP 4.3.0. Semicolon on Windows, colon otherwise.
`SCANDIR_SORT_ASCENDING` (integer)
  Available since PHP 5.4.0.
`SCANDIR_SORT_DESCENDING` (integer)
  Available since PHP 5.4.0.
`SCANDIR_SORT_NONE` (integer)
  Available since PHP 5.4.0.