Display custom checkout field value in Woocommerce admin order edit pages
问题 I have the function in functions.php: // Hook in add_filter( 'woocommerce_checkout_fields' , 'custom_override_checkout_fields' ); // Our hooked in function - $fields is passed via the filter! function custom_override_checkout_fields( $fields ) { $fields['billing']['billing_infos'] = array( 'type' => 'textarea', 'label' => __('Podaj NIP', 'woocommerce'), 'placeholder' => _x('Tutaj możesz wpisać NIP', 'placeholder', 'woocommerce'), 'required' => false, 'class' => array('form-row-wide'), 'clear'