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I'm trying this script to detect browser language and redirect to
Italian store view if the language is Italian or English store view if
the language is not Italian. The country code is correctly detected
but I'm not able to redirect to the store view. I've also tried using
header('Location: ' . $lang), lang was 'Italian' or 'default'. It
works but I don't want to have in the URL the store view code.

Here is the script:

function getCountryCode()
 $CountryCode = substr(getenv('HTTP_ACCEPT_LANGUAGE'), 0, 2);
 if ($CountryCode=='it') 
 $lang = 3;
 
 else 
 $lang = 1;
 

 return $lang;


$lang = getCountryCode();

$objectManager = MagentoFrameworkAppObjectManager::getInstance(); 

$objectManager->get('MagentoStoreModelStoreManagerInterface')-
>setCurrentStore(0);

To change store in magento 2 you need to change store code and website in index.php file

Here is some information about store view and website

Each website and each store view must have a unique identifier. This identifier is required to use MAGE_RUN_TYPE and MAGE_RUN_CODE as follows:

MAGE_RUN_TYPE can be either store or website

Use website to load a website in your storefront.
Use store to load any store view in your storefront.
MAGE_RUN_CODE is the unique website or store view code that corresponds to MAGE_RUN_TYPE

First you need to find out store code by current language using HTTP_ACCEPT_LANGUAGE or by using customer's IP

To change store you need to set store code while creating bootstrap object

$bootstrap = MagentoFrameworkAppBootstrap::create(BP, $_SERVER); 


$params = $_SERVER;

$params[MagentoStoreModelStoreManager::PARAM_RUN_CODE] = $store; // add store code here

$params[MagentoStoreModelStoreManager::PARAM_RUN_TYPE] = $website;

Please comment below code in index.php

$bootstrap = MagentoFrameworkAppBootstrap::create(BP, $_SERVER);
/** @var MagentoFrameworkAppHttp $app */
$app = $bootstrap->createApplication('MagentoFrameworkAppHttp');
$bootstrap->run($app);

And then add below code

 $lang = substr($_SERVER['HTTP_ACCEPT_LANGUAGE'], 0, 2);

 switch ($lang) 
 case "it":
 $params = $_SERVER; $params[MagentoStoreModelStoreManager::PARAM_RUN_CODE] = '<YOUR_ITALIAN_STORE_CODE_HERE>'; 
 $params[MagentoStoreModelStoreManager::PARAM_RUN_TYPE] = 'website'; 
 $bootstrap = MagentoFrameworkAppBootstrap::create(BP, $params); 
 $app = $bootstrap->createApplication('MagentoFrameworkAppHttp'); 
 $bootstrap->run($app); 
 break; 
 default: 
 $bootstrap = MagentoFrameworkAppBootstrap::create(BP, $_SERVER);
 /** @var MagentoFrameworkAppHttp $app */
 $app = $bootstrap->createApplication('MagentoFrameworkAppHttp');
 $bootstrap->run($app);
 break; 
 

Make sure you took backup your original index.php file.