exclude variation id from Dynamic Pricing Advanced Category Product Rules

exclude_samples.php

<?php
/*  DO NOT ADD SAMPLE PRODUCT WITHIN DYNAMIC DISCOUNT RULES */
add_filter( 'woocommerce_dynamic_pricing_process_product_discounts', 'exclude_sample_products', 10, 2 );

	function exclude_sample_products( $include, $product ) {
		$products_to_exclude = array();
		foreach (WC()->cart->cart_contents as $cart_item_key => $cart_item){
		if ($cart_item['variation']['attribute_pa_buy-or-try'] == 'try-before-you-buy') {
			$products_to_exclude[] = $cart_item['variation_id'];
			}
		}
		if ( in_array( $product->variation_id, $products_to_exclude ) ) {
			$include = false;
		}
		return $include;
	}