string $column_name, int $post_id )
Fires in each custom column on the Posts list table.
This hook only fires if the current post type is hierarchical, such as pages.
The name of the column to display.
The current post ID.
Combined with the manage_pages_columns filter, this allows you to add or remove (unset) custom columns to the list page pages. Note that if you are using custom post types and it has ‘
true, then you will need to use this action hook and not manage_$post_type_posts_custom_column.
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do_action( 'manage_pages_custom_column', $column_name, $post->ID );