pocketmine\block\Ladder::place PHP Method

    public function place(Item $item, Block $block, Block $target, $face, $fx, $fy, $fz, Player $player = null)
    {
        if ($target->isTransparent() === false) {
            $faces = [2 => 2, 3 => 3, 4 => 4, 5 => 5];
            if (isset($faces[$face])) {
                $this->meta = $faces[$face];
                $this->getLevel()->setBlock($block, $this, true, true);
                return true;
            }
        }
        return false;
    }