Echo specific term in an array

Question

I have a custom hierarchical taxonomy ('location') that looks like:

Tokyo
--Minato
----Roppongi

I have a post where only "Roppongi" is selected and I want to display as text only the top level parent term of the taxonomy (Tokyo) without any category link.

<?php $myterms = get_terms( array( 'taxonomy' => 'location', 'parent' => 0 ) );?>

The above code gives me...

Array ( [0] => WP_Term Object ( [term_id] => 11 [name] => Tokyo [slug] => tokyo [term_group] => 0 [term_taxonomy_id] => 11 [taxonomy] => location [description] => [parent] => 0 [count] => 0 [filter] => raw ) )

... as an output if I use...

<?php print_r($myterms);?>

... to display the result at the front-end. How do I display only the [name] value in the array? I tried the below code but get an error.

<?php echo $myterms[0]['name'];?>

Answer 1

It is an object, and you can use the following notation:

<?php echo $myterms[0]->name; ?>

Answer 2

Try the following code. You will need post ID and the taxonomy name:

function wpse_290965_top_level_tax_name( $post_id, $tax )
{
    $terms = wp_get_post_terms( $post->ID, $tax );

    $anc = get_ancestors( $terms[0]->term_id, $tax );
    $parent = array_values( array_slice( $anc, -1 ) )[0];

    $term = get_term_by( 'id', $parent, $tax );
    return $term->name;
}

Now call it like: <?php echo wpse_290965_top_level_tax_name( 234, 'location' ); ?>

Here 234 is an example of post ID.