Benutzerdefiniertes Feld für Produkte hinzufügen

add_action('woocommerce_product_options_general_product_data', 'add_custom_product_field');
function add_custom_product_field() {
    woocommerce_wp_text_input(array(
        'id' => 'custom_field',
        'label' => __('Benutzerdefiniertes Feld', 'woocommerce'),
        'placeholder' => __('Geben Sie hier Informationen ein.'),
        'desc_tip' => 'true',
    ));
}

add_action('woocommerce_process_product_meta', 'save_custom_product_field');
function save_custom_product_field($post_id) {
    $custom_field = $_POST['custom_field'];
    if (!empty($custom_field)) {
        update_post_meta($post_id, 'custom_field', esc_attr($custom_field));
    }
}