Change block only for one player

Hello, developers!
In one of my minigames I'm trying to make so changing of one block was visible by only one player.
This block should not be changed in the world, but one player will see it like it was changed.
May be I do it in wrong way, because I didn't succeed.
I'm trying to create UpdateBlockPacket and send it to the particular player.

PHP:

$pk = new UpdateBlockPacket();
$pk->x = $pos->getX();
$pk->y = $pos->getY();
$pk->z = $pos->getZ();
$pk->blockId = Block::GOLD_BLOCK;
$pk->blockData = 0;
$pk->flags = UpdateBlockPacket::FLAG_NONE; // not sure what is here
$player->dataPacket($pk);


But player doesn't see any changes
How to implement it correctly?

Thanks in advance!

 

Great!
$lv->sendBlocks([$player],[$block]); works as I wanted!
Thank you

 

Is it possible to update tiles in the same way?
I didn't found Level::sendTiles method..

 

Um, for that, you will need to send BlockEntityPacket directly to the player. Read my answer to a similar question.