pocketmine\level\generator\populator\WaterPit::canWaterPitStay PHP Метод

    private function canWaterPitStay($x, $y, $z)
    {
        $b = $this->level->getBlockIdAt($x, $y, $z);
        return ($b === Block::AIR or $b === Block::GRASS) and $this->level->getBlockIdAt($x, $y, $z) === Block::DIRT;
    }