In this post I am going to explain how to get sub categories of specific category in magento 2.

1. Using Dependency Injection

Add below code snippet in Block class.

protected $_categoryFactory;
        
public function __construct(
	\Magento\Backend\Block\Template\Context $context,        
	\Magento\Catalog\Model\CategoryFactory $categoryFactory,
	array $data = []
)
{
	$this->_categoryFactory = $categoryFactory;        
	parent::__construct($context, $data);
}

/* Get category object */
public function getCategory($categoryId)
{
	$category = $this->_categoryFactory->create()->load($categoryId);
	return $category;
}

/* Get all children categories IDs */
public function getAllChildren($asArray = false, $categoryId)
{
	return $this->getCategory($categoryId)->getAllChildren($asArray);
}

/* Get children ids comma separated */
public function getChildren($categoryId)
{
	return $this->getCategory($categoryId)->getChildren();
}

Add below code snippet in template file.

$categoryId = 10;
 
// Load category by category ID
$category = $block->getCategory($categoryId);

echo "<pre>";
print_r($category->getData());
echo "</pre>";

// Get comma-separated children category ids
$childrenCategoryIds = $block->getChildren($categoryId);

echo $childrenCategoryIds;

//Get all children category ids as an array
$allChildrenCategoryIdsArr = $block->getAllChildren(true, $categoryId);

echo "<pre>";
print_r($allChildrenCategoryIdsArr);
echo "</pre>";

//Get all children category ids ids comma-separated
$allChildrenCategoryIds = $block->getAllChildren(false, $categoryId);

echo $allChildrenCategoryIds;

 

2. Using Object Manager

$objectManager =  \Magento\Framework\App\ObjectManager::getInstance();        

$categoryFactory = $objectManager->get('\Magento\Catalog\Model\CategoryFactory');
 
$categoryId = 10;

// Load category by category ID
$category = $categoryFactory->create()->load($categoryId);

echo "<pre>";
print_r($category->getData());
echo "</pre>";

// Get comma-separated children category ids
$childrenCategoryIds = $category->getChildren($categoryId);

echo $childrenCategoryIds;

//Get all children category ids as an array
$allChildrenCategoryIdsArr = $category->getAllChildren(true);

echo "<pre>";
print_r($allChildrenCategoryIdsArr);
echo "</pre>";

//Get all children category ids ids comma-separated
$allChildrenCategoryIds = $category->getAllChildren(false);

echo $allChildrenCategoryIds;

Thats it. Enjoy Magento 2!!

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