过滤器 manage_edit-{post_type}_columns 仅用于实际添加列.要控制每个帖子(产品)的列中显示的内容，您可以使用 manage_{post_type}_posts_custom_column 操作.为每个帖子的每个自定义列调用此操作，并传递两个参数:$column 和 $postid.

The filter manage_edit-{post_type}_columns is only used to actually add the column. To control what is displayed in the column for each post (product), you can use the manage_{post_type}_posts_custom_column action. This action is called for each custom column for every post, and it passes two arguments: $column and $postid.

使用此操作非常简单，您可以在下面找到显示自定义字段offercode"的示例:

Using this action is quite easy, you can find an example to display the custom field "offercode" below:

add_action( 'manage_product_posts_custom_column', 'wpso23858236_product_column_offercode', 10, 2 );

function wpso23858236_product_column_offercode( $column, $postid ) {
    if ( $column == 'offercode' ) {
        echo get_post_meta( $postid, 'offercode', true );
    }
}

您还可以使用插件来控制此行为，例如管理栏.

You could also use a plugin to control this behaviour, such as Admin Columns.