Hiển thị phần trăm sale trong WooCommerce

// Hiển thị % sale
// Hook to display the sale percentage on both product pages and shop loop
add_action('woocommerce_before_shop_loop_item_title', 'ts_show_sale_percentage', 25);
add_action('woocommerce_before_single_product_summary', 'ts_show_sale_percentage', 25);

function ts_show_sale_percentage() {
global $product;
$max_percentage = 0; // Initialize $max_percentage here

if (!$product->is_on_sale()) return;

if ($product->is_type('simple')) {
$max_percentage = (($product->get_regular_price() - $product->get_sale_price()) / $product->get_regular_price()) * 100;
} elseif ($product->is_type('variable')) {
foreach ($product->get_children() as $child_id) {
$variation = wc_get_product($child_id);
$price = $variation->get_regular_price();
$sale = $variation->get_sale_price();
$percentage = 0; // Initialize $percentage here

if ($price != 0 && !empty($sale)) {
$percentage = ($price - $sale) / $price * 100;
}

if ($percentage > $max_percentage) {
$max_percentage = $percentage;
}
}
}

if ($product->is_type('grouped')) {
return; // Skip grouped products
}

if ($max_percentage > 0) echo "<div class='sale-perc'>-" . round($max_percentage) . "%</div>";
}