The directory path.
The mode is 0777 by default, which means the widest possible access. For more information on modes, read the details on the chmod() page.
mode is ignored on Windows.
Note that you probably want to specify the mode as an octal number, which means it should have a leading zero. The mode is also modified by the current umask, which you can change using umask().
Context support was added
with PHP 5.0.0. For a description of
contexts, refer to
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.