function get_cat_hierchy($parent,$args){

	$cats = get_categories($args);
	$ret = new stdClass;

	foreach($cats as $cat){
		if($cat->parent==$parent){
			$id = $cat->cat_ID;
			$ret->$id = $cat;
			$ret->$id->children = get_cat_hierchy($id,$args);
		}
	}

	return $ret;
}

http://wordpress.org/support/topic/get_categories-hierarchy-not-working

Returns Wordpress categories as a hierarchical object (i.e. categories with subcategories)

Wordpress category hierarchy

php, wordpress

PHP