pocketmine\level\format\mcregion\Chunk::getFullBlock PHP Method

    public function getFullBlock($x, $y, $z)
    {
        $i = $x << 11 | $z << 7 | $y;
        if (($y & 1) === 0) {
            return ord($this->blocks[$i]) << 4 | ord($this->data[$i >> 1]) & 0xf;
        } else {
            return ord($this->blocks[$i]) << 4 | ord($this->data[$i >> 1]) >> 4;
        }
    }