get sign lines on touch

How I can get sign lines on touch?

PHP:

    public function SignName(PlayerInteractEvent $event) { //Function touch
        if ($event->getBlock()->getID() == 323 || $event->getBlock()->getID() == 63 || $event->getBlock()->getID() == 68) { //definition of sign
            $sign = $event->getPlayer()->getLevel()->getTile($event->getBlock());
            if (!($sign instanceof Sign)) {
                return true;
            }
            $sign = $sign->getText();
            if ($sign[0] == "text line 1") { //text line 1
                if ($sign[1] == "text line 2") { //text line 2
                    if ($sign[2] == "text line 3") { //text line 3
                        if ($sign[3] == "text line 4") { //text line 4
                            $player->getInventory()->setChestplate(Item::get(303, 0, 1)); //your function
                            if ($event->getPlayer()->isOp()) {//definition of op
                                return true;
                            }
                            $event->getPlayer()->sendMessage("[@] You must be an OP to make sign"); //text if you don't op
                            return false;
                        }
                    }
                }
            }
        }
        return true;
    }

Thanks )

Block IDs are never greater than 255 :/

So only need:
$event->getBlock()->getID() == 63 || $event->getBlock()->getID() == 68

I HATE

PHP:

$event->getBlock()->getID() == 323

!!!!!!!!!!!!