pocketmine\block\Rail::check PHP Method

    public static function check(Rail $rail)
    {
        $array = [[[0, 1], [0, -1]], [[1, 0], [-1, 0]], [[1, 0], [-1, 0]], [[1, 0], [-1, 0]], [[0, 1], [0, -1]], [[0, 1], [0, -1]], [[1, 0], [0, 1]], [[0, 1], [-1, 0]], [[-1, 0], [0, -1]], [[0, -1], [1, 0]]];
        $arrayY = [0, 1, -1];
        $blocks = $array[$rail->getDamage()];
        $connected = [];
        foreach ($arrayY as $y) {
            $v3 = new Vector3($rail->x + $blocks[0][0], $rail->y + $y, $rail->z + $blocks[0][1]);
            $id = $rail->getLevel()->getBlockIdAt($v3->x, $v3->y, $v3->z);
            $meta = $rail->getLevel()->getBlockDataAt($v3->x, $v3->y, $v3->z);
            if (in_array($id, [self::RAIL, self::ACTIVATOR_RAIL, self::DETECTOR_RAIL, self::POWERED_RAIL]) and in_array([$rail->x - $v3->x, $rail->z - $v3->z], $array[$meta])) {
                $connected[] = $v3;
                break;
            }
        }
        foreach ($arrayY as $y) {
            $v3 = new Vector3($rail->x + $blocks[1][0], $rail->y + $y, $rail->z + $blocks[1][1]);
            $id = $rail->getLevel()->getBlockIdAt($v3->x, $v3->y, $v3->z);
            $meta = $rail->getLevel()->getBlockDataAt($v3->x, $v3->y, $v3->z);
            if (in_array($id, [self::RAIL, self::ACTIVATOR_RAIL, self::DETECTOR_RAIL, self::POWERED_RAIL]) and in_array([$rail->x - $v3->x, $rail->z - $v3->z], $array[$meta])) {
                $connected[] = $v3;
                break;
            }
        }
        return $connected;
    }