Barryvdh\DomPDF\PDF::setPaper PHP Method

    public function setPaper($paper, $orientation = 'portrait')
    {
        $this->paper = $paper;
        $this->orientation = $orientation;
        $this->dompdf->setPaper($paper, $orientation);
        return $this;
    }

 /**
  * Set the paper size (default A4)
  *
  * @param string $paper
  * @param string $orientation
  * @return $this 
  * @static 
  */
 public static function setPaper($paper, $orientation = null)
 {
     return \Barryvdh\DomPDF\PDF::setPaper($paper, $orientation);
 }