Erweiterung Extra Feld im Checkout (Woocommerce)

/**
* Add the field to the checkout 1 + 2
**/
add_action('woocommerce_after_order_notes', 'my_custom_checkout_field');


function my_custom_checkout_field( $checkout ) {


echo '<div id="my_custom_checkout_field"><h3>'.__('Titel Text').'</h3>';


woocommerce_form_field( 'THIS_IS_FIELD_1', array(
'type' => 'text',
'class' => array('my-field-class form-row-wide'),
'label' => __('Label Text 1 <abbr class="required" title="required">*</abbr>'),
'placeholder' => __('Placeholder Text 1'),
), $checkout->get_value( 'THIS_IS_FIELD_1' ));


woocommerce_form_field( 'THIS_IS_FIELD_2', array(
'type' => 'text',
'class' => array('my-field-class form-row-wide'),
'label' => __('Label Text 2 <abbr class="required" title="required">*</abbr>'),
'placeholder' => __('Placeholder Text 2'),
), $checkout->get_value( 'THIS_IS_FIELD_2' ));


echo '</div>';


}


/**
* Process the checkout 1 + 2
**/
add_action('woocommerce_checkout_process', 'THIS_IS_FIELD_1_PROCESS');


function THIS_IS_FIELD_1_PROCESS() {
global $woocommerce;


// Check if set, if its not set add an error.
if (!$_POST['THIS_IS_FIELD_1'])
$woocommerce->add_error( __('<b>Veranstaltungsort</b> darf nicht leer sein.') );
}


add_action('woocommerce_checkout_process', 'THIS_IS_FIELD_2_PROCESS');


function THIS_IS_FIELD_2_PROCESS() {
global $woocommerce;


if (!$_POST['THIS_IS_FIELD_2'])
$woocommerce->add_error( __('<b>Veranstaltungsdatum</b> darf nicht leer sein.') );
}


/**
* Update the order meta with field value 1 + 2
**/
add_action('woocommerce_checkout_update_order_meta', 'THIS_IS_FIELD_1_UPDATE');


function THIS_IS_FIELD_1_UPDATE( $order_id ) {
if ($_POST['THIS_IS_FIELD_1']) update_post_meta( $order_id, 'Veranstaltungsort', esc_attr($_POST['THIS_IS_FIELD_1']));
}


add_action('woocommerce_checkout_update_order_meta', 'THIS_IS_FIELD_2_UPDATE');


function THIS_IS_FIELD_2_UPDATE( $order_id ) {
if ($_POST['THIS_IS_FIELD_2']) update_post_meta( $order_id, 'Veranstaltungsdatum', esc_attr($_POST['THIS_IS_FIELD_2']));
}


/**
* Add the field to order emails 1 + 2
**/
add_filter('woocommerce_email_order_meta_keys', 'THIS_IS_FIELD_1_EMAIL');


function webpresentatie_titel_order_meta_keys( $keys ) {
$keys[] = 'Field 1 Text';
return $keys;
}


add_filter('woocommerce_email_order_meta_keys', 'THIS_IS_FIELD_2_EMAIL');


function webpresentatie_subtitel_order_meta_keys( $keys ) {
$keys[] = 'Field 2 Text';
return $keys;
}