Attempts to remove the directory named by dirname. The directory must be empty, and the relevant permissions must permit this. Returns TRUE on success or FALSE on failure.
Note: As of PHP 5.0.0 rmdir() can also be used with some URL wrappers. Refer to Appendix L for a listing of which wrappers support rmdir().
Note: The context parameter was added as of PHP 5.0.0.
Note: When safe mode is enabled, PHP checks whether the directory in which you are about to operate has the same UID (owner) as the script that is being executed.