* @param string $savePath Path of directory to save session files
* Default null will leave setting as defined by PHP.
* '/path', 'N;/path', or 'N;octal-mode;/path
* @param string $savePath Path of directory to save session files
* Default null will leave setting as defined by PHP.
* '/path', 'N;/path', or 'N;octal-mode;/path