Check if product exists within a specific category Magento 2

Question

I want to check whether a product exists within a specific category and if true show message.

At the moment I am having to do this via strpos using the Name attribute value.

   <?php if (strpos($_product->getName(),"Hello") !==false): ?>
    <div style="margin-bottom:10px;">
     <p><i style="font-style:italic;">A message goes here.</i></p>
    </div>
   <?php endif; ?>

Is there any way to do similar using either category name or ID?

Answer 1

Copy following code in your phtml file:

<?php $yourCatIds = array(1,2,3...);
$productCats = $_product->getAvailableInCategories();

if (count(array_intersect($yourCatIds,$productCats))) {
    echo '<li>' . $_product->getData('attributecode') . '</li>';
}
?>

Answer 2

You can check if your product belongs to a specific special category id :

<?php
$productCategoryIds = $product->getCategoryIds();
$specialCategoryId=3;

?>
    
<?php if (in_array($specialCategoryId,$productCategoryIds)): ?>
    <div style="margin-bottom:10px;">
     <p><i style="font-style:italic;">A message goes here.</i></p>
    </div>
<?php endif; ?>