Create and list categories programmatically in Magento 2

Create and list categories programmatically in Magento 2

<?php
use \Magento\Framework\App\Bootstrap;

#require __DIR__ . '/../app/bootstrap.php';
require '/www/mag2.local/app/bootstrap.php';

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

$objectManager = $bootstrap->getObjectManager();

### Setting area code
### NOTE: for more info http://devdocs.magento.com/guides/v2.1/architecture/archi_perspectives/components/modules/mod_and_areas.html
$state = $objectManager->get('\Magento\Framework\App\State');
#$state->setAreaCode('base');

$state->setAreaCode('base');

createCategory();
listCategory();

function createCategory() {
 global $objectManager;

 $category = $objectManager->get('\Magento\Catalog\Model\CategoryFactory')->create();

 $category->setName('Computer 3');
 $category->setParentId(1); // 1: root category.
 $category->setIsActive(true);
 $category->setCustomAttributes([
  'description' => 'Computer 3 desc',
 ]);

 $objectManager->get('\Magento\Catalog\Api\CategoryRepositoryInterface')->save($category);
}

function listCategory() {
 global $objectManager;

 $categoryCollection = $objectManager->get('\Magento\Catalog\Model\ResourceModel\Category\CollectionFactory')->create();
 $categoryCollection->addAttributeToSelect('*');
 $categoryCollection->addIsActiveFilter();
 $categoryCollection->addLevelFilter(2);

 foreach ($categoryCollection as $category) {
  #print_r($category->getData());
  #print_r($category->getCustomAttributes());

  echo 'Id: ' . $category->getId() . PHP_EOL;
  echo 'Name: ' . $category->getName() . PHP_EOL;
  echo 'ParentId: ' . $category->getParentId() . PHP_EOL;
  echo 'Url: ' . $category->getUrl() . PHP_EOL;
  echo 'UrlKey: ' . $category->getUrlKey() . PHP_EOL;
  echo 'Path: ' . $category->getPath() . PHP_EOL;
  echo 'Position: ' . $category->getPosition() . PHP_EOL;
  echo 'Level: ' . $category->getLevel() . PHP_EOL;
  echo 'ChildrenCount: ' . $category->getChildrenCount() . PHP_EOL;
  echo 'Description: ' . $category->getDescription() . PHP_EOL;
  echo PHP_EOL;
 }
}