Wordpress - get hierarchical parents of a taxonomy term

functions.php

<?php
/**
 * Retrieve an array of taxonomy terms that represent the parents of the given term
 * 
 * @param $term_obj_or_id
 * @param $taxonomy
 * @param array $hierarchy
 *
 * @return array
 */
function get_term_hierarchical_parents($term_obj_or_id, $taxonomy, $hierarchy = array() ) {

	if (is_numeric($term_obj_or_id)) {
		$term_obj = get_term($term_obj_or_id,$taxonomy);
	}
	else {
		$term_obj = $term_obj_or_id;
	}

	if ( empty($hierarchy)) {
		$hierarchy = array($term_obj);
	}

	if($hierarchy[0]->parent != 0) {
		$parent_term = get_term($hierarchy[0]->parent, $taxonomy);
		if ( $parent_term instanceof WP_Term) {
			array_unshift($hierarchy, $parent_term);
		}
		return get_term_hierarchical_parents($parent_term,$taxonomy, $hierarchy);
	}
	else {
		return $hierarchy;
	}

}