functions.php

<?php
/**
 * Check cart for given product id product.
 *
 * @param array $categories Categories.
 *
 * @return bool
 */
function iconic_check_for_cart_item_in_cart( $product_ids = array() ) {
	if ( empty( $product_ids ) || empty( WC()->cart ) ) {
		return false;
	}

	// Set our flag to be false until we find a product with matching ID.
	$has_item = false;

	// Loop through cart items to check for matching product IDs.
	foreach ( WC()->cart->get_cart() as $cart_item ) {
		$product_id = $cart_item['product_id'];
		
		if ( in_array( $product_id, $product_ids ) ) {
			$has_item = true;
			break;
		}
	}

	return $has_item;
}