Support for mkdir().
Directory will never be created as this is a read-only stream wrapper.
string $uri: A string containing the URI to the directory to create.
int $mode: Permission flags - see mkdir().
int $options: A bit mask of STREAM_REPORT_ERRORS and STREAM_MKDIR_RECURSIVE.
bool FALSE as directory will never be created.
Overrides PhpStreamWrapperInterface::mkdir
http://php.net/manual/en/streamwrapper.mkdir.php
public function mkdir($uri, $mode, $options) {
trigger_error('mkdir() not supported for read-only stream wrappers', E_USER_WARNING);
return FALSE;
}