magento 2 category and subcategory name for single category

Question

I am trying to fetch current subcategory name of specific parent category which id is 5 for example my category is Brand and subcategory is Brand1/Brand2/brand3 so i want fetch current subcategory category on product page .

<?php $objectManager = \Magento\Framework\App\ObjectManager::getInstance();
          $current_category = $objectManager->get('Magento\Framework\Registry')->registry('current_category');
          $parent_category = $current_category->getParentCategory();
          echo $current_category->getName();
          echo $parent_category->getName(); ?>

Answer 1

To get sub-category colletion for specific category, you need to used following code.

$categoryId = 5;
$objectManager = \Magento\Framework\App\ObjectManager::getInstance();
$current_category = $objectManager->create('Magento\Catalog\Model\Category')->load($categoryId);

// Get Sub-Category For Current Categories

$subcategories = $parent_category->getChildrenCategories();
foreach($subcategories as $subcategorie) 
{
   echo $subcategorie->getName();
}