Disable block from placing

like I don’t want people to place tnt on grass how do I disable that

 

PHP:

public function onPlace(\pocketmine\event\block\BlockPlaceEvent $event){
       
        $block = $event->getBlock();
        $player = $event->getPlayer();
       
        if($block->getId() == 46){
           
            $event->setCancelled();
            $player->sendMessage("§cYou can't place TNT.");
           
        }
    }


 

I want to in grass not in every blocks

 

Simply verify if Y -= 1 is a block of grass

 

to verify, you can get coords like

PHP:

$player->add(0,-1,0);


 

why not just use the subtract function?

PHP:

$player->subtract(0,1);


p.s. There's no need to use the third parameter if it's going to be zero, because it's set at zero by default.

 

You shouldn't even use the subtract function
Block::getSide() returns a Block instance. Plus, block below the player is not the block below the block you are mining.

PHP:

/** @var BlockBreakEvent $event */
if($event->getBlock()->getSide(Vector3::SIDE_DOWN)->getId() === Block::GRASS){
    $event->setCancelled();
}


 

Common sense at it's best

 

This is arguably the best solution. I didn't even read the original post. I just saw someone using the add function with negative parameters and shook my fist in raging anger.