streamWrapper::rename — Renames a file or directory
This method is called in response to rename().
Should attempt to rename path_from to path_to
In order for the appropriate error message to be returned this method should not be defined if the wrapper does not support renaming files.
The URL to the current file.
The URL which the path_from should be renamed to.
Returns TRUE on success or FALSE on failure.
Emits E_WARNING if call to this method fails (i.e. not implemented).
The streamWrapper->context property is updated if a valid context is passed to the caller function.