Placing A Block

How can I place a certain block at coordinates x y and z when an event is called?

In the method which is executed on the event you want to use:

PHP:

$position = new Vector3(34, 56, 23); // Some random location
$block = $level->getBlock($position);

Wont that just detect the block at 34, 56, 23 and return what type the block is?

You need to specify the Level where you want to work:

PHP:

$level = $this->getServer()->getLevelByName($levelname);

You could also get the level by using an entity that it's on it: (Ex. using a player that you already have)

PHP:

$level = $player->getLevel();

And then, the rest of the code that @Dinokiller give us:

1. Define the position:
   PHP:

   $pos = new Vector3($x, $y, $z);
2. This may vary depending on what you want to do:

• • To get a block object:
    PHP:

    $level->getBlock($pos);
  • To place a block: (Ex. Using a Bedrock block)
    PHP:

    $block = new Bedrock();
$level->setBlock($pos, $block);
  • To simulate a "Tap" on a block with a certain item: (Ex. using a Flint & Stell Item)
    PHP:

    $item = new FlintandSteel();
$level->useItemOn($pos, $item);

I hope this will help you
P.S: @PEMapModder please correct me if I'm wrong

God dang that's helpful. Thanks!!

Also try Block::get()