ordering term checkboxes

functions.php

function get_api_terms($term_id){

	$posts = get_posts(array(
		'post_type' => 'offer',
		'posts_per_page' => -1,
		'tax_query' => array(
				array(
					'taxonomy' => 'offer_category',
					'field' => 'term_id',
					'terms' => $term_id,
				)
			)
	));

	$post_term_array = array();

	foreach($posts as $post){

		$post_terms = wp_get_post_terms( $post->ID, 'offer_trait');

		foreach($post_terms as $post_term){

			$post_term_array[] = $post_term->term_id;

		}

	}

	$trait_terms = get_terms('offer_trait', array(
		'orderby' => 'term_id'
	));

	$term_array = array();

	foreach($trait_terms as $trait){
		if(($trait->parent == 0) || in_array($trait->term_id, $post_term_array)){

			$term_array[$trait->term_id] = $trait;

		}
	}

	// if($data = get_transient('api_terms_' . $term_id)){
	//
	// 	return $data;
	//
	// } else {
	//
	// 	set_transient('api_terms_' . $term_id, $term_array, 3600);
	// 	$data = $term_array;
  // }


	return $term_array;

}