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