indenter3.php

    $locations_with_children=[];
    foreach($locations as $location) {
        $locations_with_children[$location->parent_id] = true;
    }


    public static function indenter($locations, $locations_with_children, $parent_id = null, $prefix = '') {
        $results = Array();
        foreach($locations as $location) {
            $locations_with_children[$location->parent_id] = true;
            if($location->parent_id == $parent_id) {
                //append this parent node first,
                $location->use_text = $prefix.' '.$location->name;
                $location->use_image = ($location->image) ? url('/').'/uploads/locations/'.$location->image : null;
                $results[] = $location;
                //now append the children. (if we have any)
                if($locations_with_children[$location->id]) {
                    $results = array_merge($results,Location::indenter($locations,$location->id,$prefix.'--'));
                }
            }
        }
        return $results;
    }