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Magento 2: Get product categories on product page

To get the product categories on product page use following code:
$_product = $block->getProduct();
$categories = $_product->getCategoryIds();
$objectManager = \Magento\Framework\App\ObjectManager::getInstance();
foreach ($categories as $category) {
  $cat = $objectManager->create('Magento\Catalog\Model\Category')->load($category);
  echo $cat->getId()."<br/>";
}
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