pocketmine\level\Level::getCollisionCubes PHP Method

    public function getCollisionCubes(Entity $entity, AxisAlignedBB $bb, bool $entities = true) : array
    {
        $minX = Math::floorFloat($bb->minX);
        $minY = Math::floorFloat($bb->minY);
        $minZ = Math::floorFloat($bb->minZ);
        $maxX = Math::ceilFloat($bb->maxX);
        $maxY = Math::ceilFloat($bb->maxY);
        $maxZ = Math::ceilFloat($bb->maxZ);
        $collides = [];
        for ($z = $minZ; $z <= $maxZ; ++$z) {
            for ($x = $minX; $x <= $maxX; ++$x) {
                for ($y = $minY; $y <= $maxY; ++$y) {
                    $block = $this->getBlock($this->temporalVector->setComponents($x, $y, $z));
                    if (!$block->canPassThrough() and $block->collidesWithBB($bb)) {
                        $collides[] = $block->getBoundingBox();
                    }
                }
            }
        }
        if ($entities) {
            foreach ($this->getCollidingEntities($bb->grow(0.25, 0.25, 0.25), $entity) as $ent) {
                $collides[] = clone $ent->boundingBox;
            }
        }
        return $collides;
    }