Wie kontrolliere ich Produktkäufe basierend auf früheren Bestellungen in WooCommerce?

function has_bought_items() {
    $bought = false;

    // Set target product IDs
    $prod_arr = array( '21', '67' );

    // Fetch customer orders
    $customer_orders = get_posts( array(
        'numberposts' => -1,
        'meta_key'    => '_customer_user',
        'meta_value'  => get_current_user_id(),
        'post_type'   => 'shop_order', // WC orders post type
        'post_status' => 'wc-completed' // Completed orders only
    ) );

    foreach ( $customer_orders as $customer_order ) {
        // Get order ID and data
        $order_id = method_exists( $order, 'get_id' ) ? $order->get_id() : $order->id;
        $order = wc_get_order( $order_id );

        // Iterate through purchased products
        foreach ($order->get_items() as $item) {
            // Get product ID
            if ( version_compare( WC_VERSION, '3.0', '<' ) )
                $product_id = $item['product_id'];
            else
                $product_id = $item->get_product_id();

            // Check if target product ID is purchased
            if ( in_array( $product_id, $prod_arr ) )
                $bought = true;
        }
    }

    // Return result
    return $bought;
}

// Replace product IDs with your restricted products
$restricted_products = array( '20', '32', '75' );

// Get current product ID
$product_id = method_exists( $product, 'get_id' ) ? $product->get_id() : $product->id;

// If not already purchased, disable add-to-cart button
if ( !has_bought_items() && in_array( $product_id, $restricted_products ) ) {
    echo '<a class="button greyed_button">' . __("Disabled", "your_theme_slug") . '</a>';
    echo '<br><span class="greyed_button-message">' . __("Your message goes here…", "your_theme_slug") . '</span>';
} else {
    // Display regular add-to-cart button
    echo apply_filters( 'woocommerce_loop_add_to_cart_link',
        sprintf( '<a rel="nofollow" href="%s" data-quantity="%s" data-product_id="%s" data-product_sku="%s" class="%s">%s</a>',
            esc_url( $product->add_to_cart_url() ),
            esc_attr( isset( $quantity ) ? $quantity : 1 ),
            esc_attr( $product_id ),
            esc_attr( $product->get_sku() ),
            esc_attr( isset( $class ) ? $class : 'button' ),
            esc_html( $product->add_to_cart_text() )
        ),
    $product );
}