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I'm currently getting the data from a custom taxonomy using this:

$terms = get_terms(array(
    'taxonomy' => 'my_custom_taxonomy_name',
    'hide_empty' => true
));

Now, this returns a lot of stuff in each WP_Term object; term_id, name, slug, term_group, term_taxonomy_id, taxonomy, description, parent, count and filter.

I only need to get 2 of those: name and slug. How can I filter that query so it doesn't returns all that unused data?

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The way you are doing it, you can't. You would have a do a manual query for exactly what you want.

global $wpdb;
$query = "SELECT 'name', 'slug' FROM wp-term_taxonomy WHERE ..."
1
  • That looks nasty af. Sorry but it wouldn't happen. – Jimmy Adaro Apr 26 '19 at 21:04
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The "fields" parameter allows you to choose what will be returned by get_terms(). You can choose an array of names ('fields' => 'id=>names') or slugs ('fields' => 'id=>slugs'), but not an array with both properties.

There is a filter get_terms_fields, in which you can change the columns to be queried (get only name and slug), but the result will still be an array of WP_Terms objects.

I think it will be best to stay with the solution that you currently have.

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