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Code for WooCommerce to check if products in the cart belong to one of the categories we're looking for.
* Check if a specific product category is in the cart
function wc_ninja_category_is_in_the_cart() {
// Add your special category slugs here
$categories = array( 'clothing', 'posters' );
// Products currently in the cart
$cart_ids = array();
// Categories currently in the cart
$cart_categories = array();
// Find each product in the cart and add it to the $cart_ids array
foreach( WC()->cart->get_cart() as $cart_item_key => $values ) {
$cart_product = $values['data'];
$cart_ids[] = $cart_product->id;
// Connect the products in the cart w/ their categories
foreach( $cart_ids as $id ) {
$products_categories = get_the_terms( $id, 'product_cat' );
// Loop through each product category and add it to our $cart_categories array
foreach ( $products_categories as $products_category ) {
$cart_categories[] = $products_category->slug;
// If one of the special categories are in the cart, return true.
if ( ! empty( array_intersect( $categories, $cart_categories ) ) ) {
return true;
} else {
return false;
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