Check if the Product has discount in Product and Loop (Shop or Category) Page.php

Check if the product has a discount on product and loop (shop or category) pages.

<?php
global $product; // or use wc_get_product function to get product object.

$has_wdr_discount = false;
$discount = apply_filters('advanced_woo_discount_rules_get_product_discount_price_from_custom_price', false, $product, 1, 0, 'all', true, false); 
if ($discount !== false) { // check if the product has discount from woo discount rules.
    $has_wdr_discount = true;
}