Display Out-of-Stock Message on WooCommerce Product Page

Code

<?php
// Hook into WooCommerce to display a custom out-of-stock message on the product page
add_action('woocommerce_single_product_summary', 'wp_dudecom_display_out_of_stock_message', 20);

function wp_dudecom_display_out_of_stock_message() {
    global $product;

    // Check if the product is out of stock
    if (!$product->is_in_stock()) {
        // Display a custom out-of-stock message
        echo '<p class="stock out-of-stock">' . esc_html__('Sorry, this product is currently out of stock.', 'woocommerce') . '</p>';
    }
}

// Ensure out-of-stock products are displayed in the catalog
add_filter('woocommerce_product_query_meta_query', 'wp_dudecom_include_out_of_stock_products_in_catalog');

function wp_dudecom_include_out_of_stock_products_in_catalog($meta_query) {
    // Remove the default meta query that hides out-of-stock products
    foreach ($meta_query as $key => $query) {
        if (isset($query['key']) && '_stock_status' === $query['key']) {
            unset($meta_query[$key]);
        }
    }
    return $meta_query;
}

// Add a custom label to out-of-stock products in the catalog
add_action('woocommerce_before_shop_loop_item_title', 'wp_dudecom_add_out_of_stock_label', 10);

function wp_dudecom_add_out_of_stock_label() {
    global $product;

    // Check if the product is out of stock
    if (!$product->is_in_stock()) {
        // Display a custom out-of-stock label
        echo '<span class="out-of-stock-label">' . esc_html__('Out of Stock', 'woocommerce') . '</span>';
    }
}

// Enqueue custom styles for the out-of-stock message and label
add_action('wp_enqueue_scripts', 'wp_dudecom_enqueue_custom_styles');

function wp_dudecom_enqueue_custom_styles() {
    wp_add_inline_style('woocommerce-general', '
        .stock.out-of-stock {
            color: #ff0000;
            font-weight: bold;
        }
        .out-of-stock-label {
            background-color: #ff0000;
            color: #ffffff;
            padding: 5px;
            display: inline-block;
            margin-top: 10px;
        }
    ');
}
?>