Create website ,store and storeview through programmatically for Magento2

(1) Save this in file in root and run it . it will create automatically



<?php

ini_set('display_errors', 1);
error_reporting(E_ALL | E_STRICT);


use Magento\Framework\App\Bootstrap;
require __DIR__ . '/app/bootstrap.php';

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

$obj = $bootstrap->getObjectManager();

$state = $obj->get('Magento\Framework\App\State');
$state->setAreaCode('frontend');
$storeManager = $obj->get('\Magento\Store\Model\StoreManagerInterface');
$websiteFactory = $obj->get('\Magento\Store\Model\WebsiteFactory');

$groupResourceModel=$obj->get('Magento\Store\Model\ResourceModel\Group');
$storeFactory=$obj->get('Magento\Store\Model\StoreFactory');
$groupFactory=$obj->get('Magento\Store\Model\GroupFactory');
$eventManager=$obj->get('Magento\Framework\Event');
$storeModel     = $obj->create('Magento\Store\Model\Store');

$new_store = $websiteFactory->create();
$new_store->setName("da");
$new_store->setCode("da");

$new_store->save();

if ($new_store->getId()) {
$group = $groupFactory->create();
            $group->setWebsiteId($new_store->getWebsiteId());
            $group->setName('My Custom Group Name');
            $group->setRootCategoryId(2);
            $group->setDefaultStoreId(3);
            $group->save();
}
$store = $storeFactory->create();
       $store->load('my_custom_store_code');

       if(!$store->getId()){
            $group = $groupFactory->create();
            $group->load('My Custom Group Name', 'name');
            $store->setCode('my_custom_store_code');
            $store->setName('Mu Custom Store Code');
            $store->setWebsite($new_store);
            $store->setGroupId($group->getId());
            $store->setData('is_active','1');
            $store->save($store);
            // Trigger event to insert some data to the sales_sequence_meta table (fix bug place order in checkout)
             $obj->get('Magento\Store\Model\StoreManager')->reinitStores();
                  $store->$eventManager->dispatch($eventName, ['store' => $storeModel]);
        }