$start_x = 15;
    $start_y = 90;
    $size = 15;
    
    for ($i = 0; $i < $this->totLen; $i++) {
      for ($j = 0; $j < $this->totWid; $j++) {
        imagerectangle(
          $im,
          $start_x + $i * $size + $i + 1,
          $start_y + $j * $size + $j + 1,
          $start_x + $i * $size + $i + $size,
          $start_y + $j * $size + $j + $size,
          $color_black /*imagecolorallocate($im, $i, $i, $i)*/
        );
        
        //*
        if ($this->coordinate[$i][$j] == '[Empty Seat]') {
          // fill this seat with the empty seat color
          imagefilledrectangle(
            $im,
            $start_x + $i * $size + $i+2,
            $start_y + $j * $size + $j+2,
            $start_x + $i * $size + $size,
            $start_y + $j * $size + $size,
            $color_green
          );
        } elseif($this->coordinate[$i][$j] == '[Reserved Seat]') {
          //*
          imagefilledrectangle(
            $im,
            ($start_x+3) + $i * $size,
            ($start_y+2) + $j * $size,
            ($start_x+0) + $i * $size + $size,
            ($start_y-1) + $j * $size + $size,
            $color_red
          );//*/
        }
        //*/
      }
    }
    
    
    imagepng($im, "image.png");
    imagedestroy($im);