'', 'title' => 'Title', 'featured_image' => 'Image', 'date' => 'Date', 'id' => 'ID' ); return $columns; } add_filter('manage_posts_columns' , 'artistpress_custom_columns'); /** * Add the data to the new ArtistPress post type columns * * @author LTDI Studios * @since 1.0.0 * */ function artistpress_custom_columns_data( $column, $post_id ) { switch ( $column ) { case 'featured_image': echo the_post_thumbnail( 'thumbnail' ); break; case 'id': echo $post_id; break; } } add_action( 'manage_posts_custom_column' , 'artistpress_custom_columns_data', 10, 2 );