WooCommerce 제품에 '예약 주문' 및 '문의하기'와 같은 사용자 정의 재고 상태를 추가하는 방법은 무엇입니까?

// Add new stock status options
add_filter( 'woocommerce_product_stock_status_options', 'filter_woocommerce_product_stock_status_options', 10, 1 );
function filter_woocommerce_product_stock_status_options( $status ) {
    $status['pre_order'] = __( 'Pre order', 'woocommerce' );
    $status['contact_us'] = __( 'Contact us', 'woocommerce' );
    return $status;
}

// Availability text
add_filter( 'woocommerce_get_availability_text', 'filter_woocommerce_get_availability_text', 10, 2 );
function filter_woocommerce_get_availability_text( $availability, $product ) {
    switch( $product->get_stock_status() ) {
        case 'pre_order':
            $availability = __( 'Pre order', 'woocommerce' );
        break;
        case 'contact_us':
            $availability = __( 'Contact us', 'woocommerce' );
        break;
    }
    return $availability; 
}

// Availability CSS class
add_filter( 'woocommerce_get_availability_class', 'filter_woocommerce_get_availability_class', 10, 2 );
function filter_woocommerce_get_availability_class( $class, $product ) {
    switch( $product->get_stock_status() ) {
        case 'pre_order':
            $class = 'pre-order';
        break;
        case 'contact_us':
            $class = 'contact-us';
        break;
    }
    return $class;
}

// Admin stock html
add_filter( 'woocommerce_admin_stock_html', 'filter_woocommerce_admin_stock_html', 10, 2 );
function filter_woocommerce_admin_stock_html( $stock_html, $product ) {
    switch( $product->get_stock_status() ) {
        case 'pre_order':
            $stock_html = '<mark class=&quot;pre-order&quot; style=&quot;background:transparent none;color:#33ccff;font-weight:700;line-height:1;&quot;>' . __( 'Pre order', 'woocommerce' ) . '</mark>';
        break;
        case 'contact_us':
            $stock_html = '<mark class=&quot;contact-us&quot; style=&quot;background:transparent none;color:#cc33ff;font-weight:700;line-height:1;&quot;>' . __( 'Contact us', 'woocommerce' ) . '</mark>';
        break;
    }
    return $stock_html;
}