'isbn', 'label' => __('ISBN', 'woocommerce'), 'desc_tip' => true, 'description' => __('Gib die ISBN des Produkts ein.'), ]); }); // Feld speichern add_action('woocommerce_process_product_meta', function ($post_id) { if (isset($_POST['isbn'])) { update_post_meta($post_id, 'isbn', sanitize_text_field($_POST['isbn'])); } }); Seitz-Opitz | Sheema Verlag

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