pocketmine\math\Vector3::maxPlainDistance PHP Method

    public function maxPlainDistance($x = 0, $z = 0)
    {
        if ($x instanceof Vector3) {
            return $this->maxPlainDistance($x->x, $x->z);
        } elseif ($x instanceof Vector2) {
            return $this->maxPlainDistance($x->x, $x->y);
        } else {
            return max(abs($this->x - $x), abs($this->z - $z));
        }
    }