Eigene checkout Felder

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


function my_custom_checkout_field( $checkout ) {


    echo '<div id="my_custom_checkout_field"><h2>' . __('My Field') . '</h2>';


    woocommerce_form_field( 'my_field_name', array(
        'type'          => 'text',
        'class'         => array('my-field-class form-row-wide'),
        'label'         => __('Fill in this field'),
        'placeholder'   => __('Enter something'),
        ), $checkout->get_value( 'my_field_name' ));


    echo '</div>';


}


/**
 * Process the checkout
 */
add_action('woocommerce_checkout_process', 'my_custom_checkout_field_process');


function my_custom_checkout_field_process() {
    // Check if set, if its not set add an error.
    if ( ! $_POST['my_field_name'] )
        wc_add_notice( __( 'Please enter something into this new shiny field.' ), 'error' );
}


/**
 * Update the order meta with field value
 */
add_action( 'woocommerce_checkout_update_order_meta', 'my_custom_checkout_field_update_order_meta' );


function my_custom_checkout_field_update_order_meta( $order_id ) {
    if ( ! empty( $_POST['my_field_name'] ) ) {
        update_post_meta( $order_id, 'My Field', sanitize_text_field( $_POST['my_field_name'] ) );
    }
}


/**
 * Display field value on the order edit page
 */
add_action( 'woocommerce_admin_order_data_after_billing_address', 'my_custom_checkout_field_display_admin_order_meta', 10, 1 );


function my_custom_checkout_field_display_admin_order_meta($order){
    echo '<p><strong>'.__('My Field').':</strong> ' . get_post_meta( $order->id, 'My Field', true ) . '</p>';
}

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


function my_custom_checkout_field( $checkout ) {


    echo '<div id="my_custom_checkout_field"><h2>' . __('My Field2') . '</h2>';


    woocommerce_form_field( 'my_field_name', array(
        'type'          => 'text',
        'class'         => array('my-field-class form-row-wide'),
        'label'         => __('Fill in this field'),
        'placeholder'   => __('Enter something'),
        ), $checkout->get_value( 'my_field_name' ));


    echo '</div>';


}
/**
 * Process the checkout
 */
add_action('woocommerce_checkout_process', 'my_custom_checkout_field_process');


function my_custom_checkout_field_process() {
    // Check if set, if its not set add an error.
    if ( ! $_POST['my_field_name'] )
        wc_add_notice( __( 'Please enter something into this new shiny field.' ), 'error' );
}
/**
 * Update the order meta with field value
 */
add_action( 'woocommerce_checkout_update_order_meta', 'my_custom_checkout_field_update_order_meta' );


function my_custom_checkout_field_update_order_meta( $order_id ) {
    if ( ! empty( $_POST['my_field_name'] ) ) {
        update_post_meta( $order_id, 'My Field2', sanitize_text_field( $_POST['my_field_name'] ) );
    }
}


/**
 * Display field value on the order received page
 */
add_action( 'woocommerce_order_details_after_customer_details', 'my_custom_checkout_field_display_admin_order_meta', 10, 1 );


function my_custom_checkout_field_display_admin_order_meta($order){
    echo '<p><strong>'.__('Zusatzangaben').':</strong> ' . get_post_meta( $order->id, 'My Field2', true ) . '</p>';
}

// Woocommerce German Market
add_filter( 'get_post_metadata', 'catch_get_post_meta_from_checkout', 100, 4 );
 
function catch_get_post_meta_from_checkout($metadata, $object_id, $meta_key, $single){    
    $catch_meta = 'product_function_desc_textarea'; // original transaction meta key 
    $meta_needed = 'checkout_product_features_summary';
    
    if ((is_page('bestellung_pruefen_bezahlen')) && ( isset( $meta_key ) && $catch_meta == $meta_key )){ // only for checkout page        
        remove_filter( 'get_post_metadata', 'catch_get_post_meta_from_checkout', 100 ); // remove filter for using function
        
        $custom_meta_value = get_post_meta( $object_id, $meta_needed, TRUE ); // get my custom value, pls
        add_filter('get_post_metadata', 'catch_get_post_meta_from_checkout', 100, 4); // restore catching        
        return $custom_meta_value; // return custom value
    }
 
    // Return original if the check does not pass
    return $metadata;
 
}