Get top-most parent of a taxonomy term

gistfile1.aw

<?php
/****************************************************
	Get top-most parent of a taxonomy term
****************************************************/


function get_term_top_most_parent($term_id, $taxonomy){

    $term  = get_term_by( 'id', $term_id, $taxonomy);

    if ( $term->parent != 0 ) {
        return get_term_top_most_parent ( $term->parent, $taxonomy );
    } else {
        return $term;
    }
}


function hey_top_parents($taxonomy) {
$terms =  wp_get_object_terms(get_the_ID(), $taxonomy);
$top_parent_terms = array();
foreach ($terms as $term){
	
    //get top level parent
    $top_parent = get_term_top_most_parent($term->ID, $taxonomy);

    //check if you have it in your array to only add it once
    if (!in_array($top_parent->ID,$top_parent_terms)){
        $top_parent_terms[] = $top_parent->ID;
    }
}

foreach ($top_parent_terms as $term) {
 	$r = '<a href="' . get_term_link($term->slug, $taxonomy) . '">' . $term->name . '</a>';
}
	return $r;

}