我想在 WooCommerce 后端显示一个附加列（在订单概述中）。 该列应包含我定义的自定义字段（交货日期）。

这个怎么做？

如果有人仍然需要它 - 有关如何在 Woocommerce 订单列表中添加新列的说明。无需取消设置默认列，只需将其添加到您的functions.php中，您的代码将对更新有效。

1.定义列位置和名称

add_filter( 'manage_edit-shop_order_columns', 'MY_COLUMNS_FUNCTION' );
function MY_COLUMNS_FUNCTION($columns){
    $new_columns = (is_array($columns)) ? $columns : array();
    unset( $new_columns['order_actions'] );

    //edit this for you column(s)
    //all of your columns will be added before the actions column
    $new_columns['MY_COLUMN_ID_1'] = 'MY_COLUMN_1_TITLE';
    $new_columns['MY_COLUMN_ID_2'] = 'MY_COLUMN_2_TITLE';
    //stop editing

    $new_columns['order_actions'] = $columns['order_actions'];
    return $new_columns;
}

2. 对于每个自定义列，显示值

add_action( 'manage_shop_order_posts_custom_column', 'MY_COLUMNS_VALUES_FUNCTION', 2 );
function MY_COLUMNS_VALUES_FUNCTION($column){
    global $post;
    $data = get_post_meta( $post->ID );

    //start editing, I was saving my fields for the orders as custom post meta
    //if you did the same, follow this code
    if ( $column == 'MY_COLUMN_ID_1' ) {    
        echo (isset($data['MY_COLUMN_1_POST_META_ID']) ? $data['MY_COLUMN_1_POST_META_ID'] : '');
    }
    if ( $column == 'MY_COLUMN_ID_2' ) {    
        echo (isset($data['MY_COLUMN_2_POST_META_ID']) ? $data['MY_COLUMN_2_POST_META_ID'] : '');
    }
    //stop editing
}

3.（可选）使列可排序的函数

add_filter( "manage_edit-shop_order_sortable_columns", 'MY_COLUMNS_SORT_FUNCTION' );
function MY_COLUMNS_SORT_FUNCTION( $columns ) {
    $custom = array(
        //start editing

        'MY_COLUMN_ID_1'    => 'MY_COLUMN_1_POST_META_ID',
        'MY_COLUMN_ID_2'    => 'MY_COLUMN_2_POST_META_ID'

        //stop editing
    );
    return wp_parse_args( $custom, $columns );
}