system/classes/Route.php
protected function partialPathString($offset, $length = null, $dataArray = false)
    {
        if ($dataArray == false) {
            $dataArray = $this->path;
        }
        $partialPathArray = array_slice($dataArray, $offset, $length);
        return implode('/', $partialPathArray);
    }
protected function partialPathString($offset, $length = null, $dataArray = false)
    {
        if ($dataArray == false) {
            $dataArray = $this->path;
        }
        $partialPathArray = array_slice($dataArray, $offset, $length);
        return implode('/', $partialPathArray);
    }
The following two methods work off the URL path stored in $this->path.
They are used to return part of that path in either Array or String form
when asked to by the recursive calls of routeFind().