get_the_terms() returns an array with keys that are not starting from 0

[boryanka]

This is easy to reproduce. You need a custom post type (in my case 'events') and a custom taxonomy (in my case 'eventtype').

When I try to retrieve the names of the eventtypes associated with the current event it gives back an array. The issue is that the key of each array line is the ID of the term. Instead of starting from 0.

The code:

$terms = get_the_terms( $post->ID, 'eventtype' );

The output:

array(1) {
  [6]=>
  object(stdClass)#249 (10) {
    ["term_id"]=>
    string(1) "6"
    ["name"]=>
    string(5) "Event"
    ["slug"]=>
    string(5) "event"
    ["term_group"]=>
    string(1) "0"
    ["term_taxonomy_id"]=>
    string(1) "6"
    ["taxonomy"]=>
    string(9) "eventtype"
    ["description"]=>
    string(0) ""
    ["parent"]=>
    string(1) "0"
    ["count"]=>
    string(1) "1"
    ["object_id"]=>
    string(3) "182"
  }
}

[markoheijnen]

As far as I can tell that is default behaviour. As you can see the number is the term_id

[boryanka]

Yes, maybe it is, but what would you do if you had let's say 5 terms for this post and you only wanted to list the first or last one?

There are ways to do it, of course - workarounds.

[scribu]

I think the workaround is pretty easy:

$terms = get_the_terms( ... );
$first_term = reset( $terms );
$last_term = end( $terms );

[JustinSainton]

Or use array_values(). Surely the benefits of having the $term_id listed far outweigh the issues of indexing you're describing. Not only that, but changing the behavior would undoubtedly break countless plugins that rely on the current behavior.

[nacin]

Replying to JustinSainton:

Or use array_values(). Surely the benefits of having the $term_id listed far outweigh the issues of indexing you're describing. Not only that, but changing the behavior would undoubtedly break countless plugins that rely on the current behavior.

Indeed.

[SergeyBiryukov]

#24562 was marked as a duplicate.

[leedo]

Perhaps the docs should be updated to reflect this?

[dcavins]

I noticed the behavior mentioned in this ticket, but only on the front end. When I use get_the_terms in the WP admin area, the array looks like this:

Array
(
    [0] => stdClass Object
        (
            [term_id] => 1660
            [name] => Bonner County
            [slug] => bonner-county-idaho
            [term_group] => 0
            [term_taxonomy_id] => 1755
            [taxonomy] => geographies
            [description] => 05000US16017
            [parent] => 841
            [count] => 0
        )
)

I don't know if there are disadvantages, but wp_get_object_terms returns an array with keys of 0, 1, and so on, in both the front end and admin area, if that's the preferred behavior.