pocketmine\block\PoweredRail::canConnect PHP Method

    public function canConnect(Rail $block)
    {
        if ($this->distanceSquared($block) > 2) {
            return false;
        }
        /** @var Vector3 [] $blocks */
        if (count($blocks = self::check($this)) == 2) {
            return false;
        }
        if (isset($blocks[0])) {
            $v3 = $blocks[0]->subtract($this);
            $v33 = $block->subtract($this);
            if (abs($v3->x) == abs($v33->z) and abs($v3->z) == abs($v33->x)) {
                return false;
            }
        }
        return $blocks;
    }