Code-Snippets-Functions/Execute a function on a child site/WooCommerce/show-certain-countries-on-checkout-for-particular-products-in-cart.txt

function filter_woocommerce_countries_allowed_countries( $countries ) {
    // Cart or checkout page
    if ( is_cart() || is_checkout() ) {     
        // The targeted product ids
        $targeted_ids = array( 30, 815 );

        // Flag
        $found = false;
        
        if ( WC()->cart ) {         
            // Loop through cart items
            foreach ( WC()->cart->get_cart() as $cart_item ) {
                if ( array_intersect( $targeted_ids, array( $cart_item['product_id'], $cart_item['variation_id'] ) ) ) {
                    $found = true;
                    break;
                }
            }
        }
        
        // True
        if ( $found ) {
            // Remove
            unset( $countries[ 'NL' ] );
            unset( $countries[ 'FR' ] );
        }
    }

    // Return
    return $countries;
}
add_filter( 'woocommerce_countries_allowed_countries', 'filter_woocommerce_countries_allowed_countries', 10, 1 );