DATA_FLAG_SNEAKING?

I like to set a npc sneaking with DATA_FLAG_SNEAKING but I don't know how to do this.

PHP:

            $pk = new AddPlayerPacket();
            $pk->eid = Entity::$entityCount++;
            $pk->uuid = UUID::fromRandom();
            $pk->username = "Test";
            $pk->yaw = rand(0, 360);
            $pk->item = Item::get(0);
            $pk->pitch = rand(0, 90);
            $pk->x = $player->x;
            $pk->y = $player->y;
            $pk->z = $player->z;
            $pk->metadata = [
                Entity::DATA_FLAGS => [Entity::DATA_TYPE_BYTE, 0 << Entity::DATA_FLAG_INVISIBLE],
                Entity::DATA_NAMETAG => [Entity::DATA_TYPE_STRING, "Test"],
                Entity::DATA_SHOW_NAMETAG => [Entity::DATA_TYPE_BYTE, 1],
                Entity::DATA_LEAD_HOLDER => [Entity::DATA_TYPE_LONG, -1],
                Entity::DATA_FLAG_SNEAKING => // ?
            ];
$player->dataPacket($pk);


 

Please use [ PHP ] and [ /PHP ] for PHP codes

PHP:

$pk = new AddPlayerPacket();
$pk->entityRuntimeId = Entity::$entityCount++; //"eid" has been replaced, it's "entityRuntimeId"
$pk->uuid = UUID::fromRandom();
//$pk->username = "Test"; //This is totally useless
$pk->yaw = rand(0, 360); //What do you want to do ? rand() is no adapted there
$pk->item = Item::get(0);
$pk->pitch = rand(0, 90); //What do you want to do ? rand() is no adapted there
$pk->x = $player->x;
$pk->y = $player->y;
$pk->z = $player->z;
$pk->metadata = [
       Entity::DATA_FLAGS => [Entity::DATA_TYPE_BYTE, 0 << Entity::DATA_FLAG_INVISIBLE],
       Entity::DATA_NAMETAG => [Entity::DATA_TYPE_STRING, "Test"],
       Entity::DATA_SHOW_NAMETAG => [Entity::DATA_TYPE_BYTE, 1],
       Entity::DATA_LEAD_HOLDER_EID => [Entity::DATA_TYPE_LONG, -1], //It's DATA_LEAD_HOLDER_EID and not DATA_LEAD_HOLDER. Don't report something there if you are using a spoon, spoons have different problems and codes.
       Entity::DATA_FLAG_SNEAKING => [Entity::DATA_TYPE_BYTE, 1]
];
$player->dataPacket($pk);