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When you register a custom column like so:

//Register thumbnail column for au-gallery type
add_filter('manage_edit-au-gallery_columns', 'thumbnail_column');
function thumbnail_column($columns) {
$columns['thumbnail'] = 'Thumbnail';
return $columns;
}

by default it appears as the last one on the right. How can I change the order? What if I want to show the above column as the first one or the second one?

Thank you in advance

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4 Answers 4

up vote 7 down vote accepted

Hi @Mirko:

You are basically asking a PHP question, but I'll answer it because it's in the context of WordPress. You basically need to rebuild the columns array, inserting your column before the column you want it to be left of:

add_filter('manage_posts_columns', 'thumbnail_column');
function thumbnail_column($columns) {
  $new = array();
  foreach($columns as $key => $title) {
    if ($key=='author') // Put the Thumbnail column before the Author column
      $new['thumbnail'] = 'Thumbnail';
    $new[$key] = $title;
  }
  return $new;
}
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Short and clear, thank you! –  Mirko Feb 3 '11 at 11:34
    
@Mirko: Thanks! You are very welcome. –  MikeSchinkel Feb 3 '11 at 11:35
    
yea i guess that would be and easier way :) but i got the idea right in my answer. nice thinking. –  Bainternet Feb 3 '11 at 11:47
    
בניית אתרים - I was almost finished writing my answer when you answered yours, so our answers "crossed in the mail", so to speak. Anyway, it took me a while to figure that out; it certainly didn't occur to me the first time I needed it. –  MikeSchinkel Feb 3 '11 at 11:59
    
One thing to watch out for: what happens if another plugin removed the author column? Your own thumbnail column would disappear also. You could do an isset($new['thumbnail']) check before returning $new. If it isn't set, just append it at the end, for example. –  Geert Nov 3 '12 at 19:47

the only way i know how is to create your own array of columns

// Add to admin_init function
add_filter('manage_edit-au-gallery_columns', 'add_my_gallery_columns');

function add_my_gallery_columns($gallery_columns) {
        $new_columns['cb'] = '<input type="checkbox" />';

        $new_columns['id'] = __('ID');
        $new_columns['title'] = _x('Gallery Name', 'column name');
                // your new column somewhere good in the middle
        $new_columns['thumbnail'] = __('Thumbnail');

        $new_columns['categories'] = __('Categories');
        $new_columns['tags'] = __('Tags');
        $new_columns['date'] = _x('Date', 'column name');

        return $new_columns;
    }

and then render this extra added columns like you normally would

// Add to admin_init function
    add_action('manage_au-gallery_posts_custom_column', 'manage_gallery_columns', 10, 2);

    function manage_gallery_columns($column_name, $id) {
        global $wpdb;
        switch ($column_name) {
        case 'id':
            echo $id;
                break;

        case 'Thumbnail':
            $thumbnail_id = get_post_meta( $id, '_thumbnail_id', true );
                // image from gallery
                $attachments = get_children( array('post_parent' => $post_id, 'post_type' => 'attachment', 'post_mime_type' => 'image') );
                if ($thumbnail_id)
                    $thumb = wp_get_attachment_image( $thumbnail_id, array($width, $height), true );
                elseif ($attachments) {
                    foreach ( $attachments as $attachment_id => $attachment ) {
                        $thumb = wp_get_attachment_image( $attachment_id, array($width, $height), true );
                    }
                }
                if ( isset($thumb) && $thumb ) {echo $thumb; } else {echo __('None');}
            break;
        default:
            break;
        } // end switch
}

Hope This Helps

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If you have plugins like WPML which automatically add columns, even to custom post types, you may have complicated code in your table header.

You don't want to copy the code to your column definition. Why would anyone, for that matter.

We just want to extend the already provided, nicely formatted and sortable default columns.

In fact, this is just seven lines of code, and it keeps all other columns intact.

# hook into manage_edit-<mycustomposttype>_columns
add_filter( 'manage_edit-mycustomposttype_columns', 'mycustomposttype_columns_definition' ) ;

# column definition. $columns is the original array from the admin interface for this posttype.
function mycustomposttype_columns_definition( $columns ) {

  # add your column key to the existing columns.
  $columns['mycolumn'] = __( 'Something different' ); 

  # now define a new order. you need to look up the column 
  # names in the HTML of the admin interface HTML of the table header. 
  #   "cb" is the "select all" checkbox.
  #   "title" is the title column.
  #   "date" is the date column.
  #   "icl_translations" comes from a plugin (in this case, WPML).
  # change the order of the names to change the order of the columns.
  $customOrder = array('cb', 'title', 'icl_translations', 'mycolumn', 'date');

  # return a new column array to wordpress.
  # order is the exactly like you set in $customOrder.
  foreach ($customOrder as $colname)
    $new[$colname] = $columns[$colname];    
  return $new;
}

hope this helps..

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The easiest way to change the order of WordPress admin columns is to use the Codepress Admin Columns plugin. It allows you to re-order, add, remove, and resize any column - including custom ones like the one you created.

This plugin is so useful I install it by default and really clean-up my admin columns.

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