Post Taxonomy Column

This plugin improves the All Posts or All Pages view in the admin section by adding columns for
any taxonomy you wish. There are two ways to use it:

1. Use the setting page to select the taxonomies.
2. Write code to add a column in exactly the right place.

Install the plugin the normal way:

1. Upload the post-taxonomy-column folder to the /wp-content/plugins/ directory.
2. Activate the plugin through the ‘Plugins’ menu in WordPress.
3. Visit the settings page to switch columns on and off.

Alternatively, you can use the manage_edit-post_type_columns filter to adjust the
columns more precisely.

Suppose you have a custom post type called Movies,
and a custom taxonomy called Year of Release with the code year,
and you’d like to add this to the ‘All Movies’ listing in the admin.

Put the following code into functions.php or a plugin:

add_filter("manage_edit-movie_columns", "add_movie_columns");
function add_movie_columns ($columns) {
    $columns['year'] = 'Year of Release';
    return $columns;
}

This plugin will then fill in values for the Year column.

Where do these taxonomies come from?

You’ll need to add them, either with code in your theme’s functions.php or using a plugin.
This plugin does not register or manage taxonomies.

Does this work with custom post types?

Yes.

Can I use this plugin to create custom post types?

No, this plugin does not register or manage custom post types.
You’ll need to add them either with code in your theme’s functions.php or using a plugin.

My taxonomy/post type isn’t showing up. What’s wrong?

Make sure your taxonomies and post types are public:

 register_post_type('foo', array(
   ...
   'public' => true
 ));

What will this do if I add a column code that isn’t a taxonomy?

Nothing. You’ll get a blank cell.

Can I have more than one taxonomy column?

Yes, as many as you like as long as the column’s ID matches up with the taxonomy ID.

Can I control the order of the columns? How do I add a column in the middle rather than the end?

To fine-tune the order of the columns, you will need to control them yourself.
Turn off the checkboxes in the settings page, and instead use the manage_edit-xxx_columns
filter which lets you adjust the columns any way you wish.

For example, to add the year column after the author column:

add_filter("manage_edit-movie_columns", "add_movie_columns");
function add_movie_columns ($columns) {
    $out = array();
    foreach ($columns as $key => $value) {
      $out[$key] = $value;
      if ($key == "author")
        $out["year"] = "Year of Release";
    }
    return $out;
}

Make sure your filter returns a value of some sort, or you’ll end up with no columns at all.

1. 

   A Keywords column added to the All Pages listing.

2. 

   The settings page.

1.1

Added a settings page and code to add columns for you. No more code required!

1.0

The first release. Required you to add much of the code yourself.