Mrthdrb

How to get a list of product categories id in the basket?
Here I get the name of the product.

use MagentoCheckoutModelSession;
class Collect extends AbstractCarrier implements CarrierInterface
{
 protected $_code = 'chester_collect';
 protected $_session;
 public function __construct(
 Session $session,
 array $data = []
 ) 
 $this->_session = $session;
 parent::__construct($scopeConfig, $rateErrorFactory, $logger, $data);
 

public function isActive()
 
 /** @var $item MagentoQuoteModelQuoteItem */
 $items = $this->_session->getQuote()->getAllItems();
 foreach ($items as $item)
 var_dump($item->getName());
 
 

But how to get all the categories of goods that are in the basket?

I have modified you code with below code:

use MagentoCheckoutModelSession;
class Collect extends AbstractCarrier implements CarrierInterface

 protected $_code = 'chester_collect';
 protected $_session;
 private $_objectManager;
 public function __construct(
 Session $session,
 MagentoFrameworkObjectManagerInterface $objectmanager,
 array $data = []
) 
 $this->_session = $session;
 $this->_objectManager = $objectmanager;
 parent::__construct($scopeConfig, $rateErrorFactory, $logger, $data);


public function isActive()

 /** @var $item MagentoQuoteModelQuoteItem */
 $items = $this->_session->getQuote()->getAllItems();
 foreach ($items as $item)
 var_dump($item->getName());
 $productid = $item->getProductId();
 $product = $this->_objectManager->create('MagentoCatalogModelProduct')- >load($productid);
 $categoriesIds = $product->getCategoryIds();
 var_dump($categoriesIds);
 

 

Code for Getting Cart Items and get Categories Ids and names by
loading Products from Items

 $objectManager = MagentoFrameworkAppObjectManager::getInstance();
 $cart = $objectManager->get('MagentoCheckoutModelCart'); 

// retrieve quote items collection
$itemsCollection = $cart->getQuote()->getItemsCollection();

// get array of all items what can be display directly
$itemsVisible = $cart->getQuote()->getAllVisibleItems();

// retrieve quote items array
 $items = $cart->getQuote()->getAllItems();

foreach($items as $item) 
 $productid = $item->getProductId();
 $product = $objectManager->create('MagentoCatalogModelProduct')->load($productid);
 $categoriesIds = $product->getCategoryIds(); /*will return category ids array*/

 foreach($categoriesIds as $categoryId)
 $cat = $objectManager->create('MagentoCatalogModelCategory')->load($categoryId);
 echo $cat->getName();
 

I hope this will help