Online PHP editor | output for AVVZI

<?php $array = [ ['App', 'Classes', 'Auth'], ['App', 'Classes', 'Auth'], ['App', 'Classes', 'Middleware'], ['App', 'Classes', 'Phone'], ['App', 'Classes', 'Auth'], ['App', 'Mail'], ['App', 'Mail', 'Sender'], ['App', 'Box'], ]; $hierarchy = []; foreach($array as $each_data){ $curr_hierarchy = &$hierarchy; foreach($each_data as $each_namespace){ if(!isset($curr_hierarchy[$each_namespace])){ $curr_hierarchy[$each_namespace] = []; } $curr_hierarchy = &$curr_hierarchy[$each_namespace]; } } print_r($hierarchy);