How do you properly set NBT

Adding NBT tag "test" (string), which has a value of "hey".

PHP:

/** @var Item $item */
$nbt = $item->getNamedTag() ?? new CompoundTag("", []);
$nbt->test = new StringTag("test", "hey");
$item->setNamedTag($nbt);


If item has NBT tag "test" (string), do something.

PHP:

/** @var Item $item */
if (isset($item->getNamedTag()->test)) {
    //$item has NBT tag: test.
    /** @var string $test */
    $test = $item->getNamedTag()->test;//"hey"
}


Adding NBT tag "test" (integer).

PHP:

/** @var Item $item */
$nbt = $item->getNamedTag() ?? new CompoundTag("", []);
$nbt->test = new IntTag("test", 69);
$item->setNamedTag($nbt);


If item has NBT tag "test" (integer), do something.

PHP:

/** @var Item $item */
if (isset($item->getNamedTag()->test)) {
    //$item has NBT tag: test.
    /** @var int $test */
    $test = $item->getNamedTag()->test->getValue();//69
}


Unsetting/Removing NBT tag "test".

PHP:

/** @var Item $item */
$nbt = $item->getNamedTag() ?? new CompoundTag("", []);
unset($nbt->test);
$item->setNamedTag($nbt);


If the $item was in a (Player)$player's hand, you must update it after interfering with the NBT tag by...

PHP:

$player->getInventory()->setItemInHand($item);


 

For saving an array of integers to NBT, use IntArrayTag

PHP:

/** @var Item $item */
$nbt = $item->getNamedTag() ?? new CompoundTag("", []);
$nbt->testarray = new IntArrayTag("testarray", [0, 8, 3, 1]);
$item->setNamedTag($nbt);

/** Checking if item has "testarray" tag. */
$nbt = $item->getNamedTag() ?? new CompoundTag("", []);
if (isset($nbt->testarray)) {
    $array = $nbt->testarray->getValue();//array(0, 8, 3, 1)
}


You can also customize entity's and tile's NBT.

PHP:

/** @var Tile|Entity $xyz */
$xyz->namedtag->test = new StringTag("test", "hey");


 

Hmm, haven't tried that. But since argument 0 describes the name for the tag, the mismatch wont allow you to access it in any way.

The rest of the tags are what their class name describes.
Byte tag => Setting a byte value.
Float tag => Setting a float int value.
I really don't know what EndTag is used for, though.
Refer to https://docs.oracle.com/javase/tutorial/java/nutsandbolts/datatypes.html for information on data types.

 

Doesn't work for some reason, here's my code

PHP:

$nbt = $inHand->getNamedTag() ?? new CompoundTag("", []);
                           $nbt->test = new StringTag("Test", "Hi!");
                         $inHand->setNamedTag($nbt);
                         $inv->setItemInHand($inHand);

No errors also, but the tag doesn't appear on the item

 

It must be new StringTag("test", "Hi!");

 

Ah my bad , thanks for help

 

Actually, keep the $nbt->test as is, change the tag to StringTag("test", "Hi!");

 

Still not working muq :/

 

Send the code

 

PHP:

 if($inHand->getId() == 276){
                        if($inv->contains(Item::get(388,0,20))){
                           //$inHand->setCustomName($inHand->getName()."\n§0§r§7Bless I ");
                           //$inHand->addEnchantment(Enchantment::getEnchantment(12));
                           $nbt = $inHand->getNamedTag() ?? new CompoundTag("", []);
                           $nbt->test = new StringTag("test", "Hi!");
                         $inHand->setNamedTag($nbt);
                         $inv->setItemInHand($inHand);
                           $inv->removeItem(Item::get(388,0,20));
                           $sender->sendMessage("§6>§a Combined successfully! Relog if you can't see the tag.");
                           //$sender->getInventory()->setItemInHand($inHand);
                          return true;

 

That should work. How do you know that it doesn't work?

 

When I run the command and hold the item, everything works fine but the tag doesn't appear when u hold the item...

 

It's a custom NBT tag. It doesn't "appear" on items.

 

Then how to set nbt that appears?

 

You can't use custom NBTs for this purpose. NBTs are used to store data.

 

Ok how to use multiple string tags at once cuz it doesn't work if I do that manually/in ur way.... I may sound nooby

 

Are you just looking to set an item's name label?