I have tried this here but unfortunately nothing happened PHP: $x = -219; $y = 3; $z = 124; $level = $player->getLevel()->getFolderName(); $eChest = new ChestInventory($player); $eChest->openAt(new Position($x, $y, $z, $level));
ChestInventory:: openAt() isn't a PMMP member function, as far as I can tell. If you read the rest of the thread, it only concerns opening chest inventories by spawning chests. The only method I can think of would be creating a Chest tile without setting it to a chest block. I'm not sure if that's possible though.
Why not use this function = = https://github.com/iTXTech/Genisys/blob/master/src/pocketmine/Player.php#L4006
While that function does exist in PMMP too, it requires an instance of Inventory, and to create a ChestInventory, you need a tile.