public function moveLevel($diff)
    {
        $this->level += $diff;

        if (isset($this->nestedSetNode)) {
            $this->nestedSetNode->moveLevel($diff);
        }
        return $this;
    }
public function moveLevel($diff)
    {
        $this->level += $diff;

        if (isset($this->nestedSetNode)) {
            $this->nestedSetNode->moveLevel($diff);
        }
        return $this;
    }
public function moveLevel ( $ diff ) { $ this -> level += $ diff ; if ( isset ( $ this -> nestedSetNode ) ) { $ this -> nestedSetNode -> moveLevel ( $ diff ) ; } return $ this ; }
Move depth level by the difference
@param int $diff
@return AbstractPage
Move depth level by the difference