[NEW-API] Get sign text in PlayerInteractEvent

Hi, I want to get the text from a sign when I click it.
I'm using the PlayerInteractEvent, although it does not work if I have nothing in selected in my inventory.
Anyway, my code is this:

PHP:

    public function playerBlockTouch(PlayerInteractEvent $event){
        $player = $event->getPlayer();
        $block = $event->getBlock();
        $player->sendMessage("Block clicked!");
        if($block->getID() == 323 || $block->getID() == 63 || $block->getID() == 68){
            $player->sendMessage("Sign clicked!");
            $text = $block->getText();
            //some other code
        }
    }

But this doesn't work, the console returns an error with the getText() function:

I've tried also by using

PHP:

if($block instanceof Sign){

instead of

PHP:

if($block->getID() == 323 || $block->getID() == 63 || $block->getID() == 68){

but i don't receive the "Sign clicked!" message, so apparently $block is not a Sign object; probably it's just a Block object, and I can't use getText() on a non-Sign object. I don't really know!
Can someone help me?

PHP:

if($blockID==63 or $blockID==68 or $blockID==323){
   $tile = $event->getBlock()->getLevel()->getTile(new Vector3($event->getBlock()->getX(),$event->getBlock()->getY(),$event->getBlock()->getZ()));
   if($tile instanceof Sign){
      $text = $tile->getText();
      $event->getPlayer()->sendMessage("The first line of the sign is ".$text[0]);
   }
}

Hope this helped.

SignPost doesn't have a function called getText(). Get the tile from the level using $level->getTile().

$block is already an instance of Vector3. You can put $block instead of new Vector3(...).

Oh lol

$block is not an instance of Sign. It is an instance of SignPost.
SignPost is a subclass of block\Block. Sign is a subclass of Tile. They are different, although similar (both as subclasses of Position).

Yeah this worked, thank you both

Ah, one last thing: will PlayerInteractEvent event ever be called also if I don't have anything in my hand?

I think yes. The item will become air. (Instance of Air)

I don't know. I hope so.