Chest

Is there a way to keep the chest opened and close the inventory for the player if he opens a chest?

 

You mean the chest opening animation? You can use BlockEventPacket. I'll update this post with how PMMP uses if I ever find it. XD

 

Open animation:

PHP:

/** @var Level $level */
/** @var int $x */
/** @var int $y */
/** @var int $z */
$pk = new BlockEventPacket();
$pk->x = $x;
$pk->y = $y;
$pk->z = $z;
$pk->case1 = 1;
$pk->case2 = 2;
$level->addChunkPacket($x >> 4, $z >> 4, $pk);


Close animation:

PHP:

/** @var Level $level */
/** @var int $x */
/** @var int $y */
/** @var int $z */
$pk = new BlockEventPacket();
$pk->x = $x;
$pk->y = $y;
$pk->z = $z;
$pk->case1 = 1;
$pk->case2 = 0;
$level->addChunkPacket($x >> 4, $z >> 4, $pk);


 

Unless I'm mistaken, you can also broadcast the packet as you wish, such as to a single player with $player->dataPacket.