public function setTotalOrder( $totalOrder )
    {
        if (preg_match( '/^(?:\d*\.)?\d+$/', $totalOrder ) !== 1) {
            throw new InvalidArgumentException( sprintf( 'Order total value should be a non-negative number (%s)',
                $totalOrder ) );
        }

        $this->totalOrder = (float)number_format( $totalOrder, 4, '.', '' );

        return $this;
    }
public function setTotalOrder( $totalOrder )
    {
        if (preg_match( '/^(?:\d*\.)?\d+$/', $totalOrder ) !== 1) {
            throw new InvalidArgumentException( sprintf( 'Order total value should be a non-negative number (%s)',
                $totalOrder ) );
        }

        $this->totalOrder = (float)number_format( $totalOrder, 4, '.', '' );

        return $this;
    }
@param  float $totalOrder

@return $this