Solved String tag api 4.0.0

I'm kinda confused with string tag in api 4.0.0
in api 3.0.0, I set the tag like this

PHP:

$item->setNamedTagEntry(new StringTag("Test", "Test2"));

And I check the tag like this

PHP:

if($item->getNamedTagEntry()->hasTag("Test") && $item->getNamedTagEntry()->getStringTag("Test") == "Test2"){

}

Now, how to set and get string tag like above in api 4.0.0 ?

My try :

PHP:

//set tag
$item->setNamedTag(new StringTag("Test", "Test2"));

//get tag
if($item->getNamedTag()->hasNamedTag("Test") && $item->getNamedTag()->getString("Test") == "Test2"){
}

 

PHP:

// setting nbt
$item->getNamedTag()->setString('test', 'testnbt');

// getting nbt
$item->getNamedTag()->getTag('test'); // returns 'testnbt'


 

Thank you