Online PHP editor | refs for n7vYW

<?php $locations = [ ['country'=>'USA', 'state'=>'New York', 'city'=>'NYC', 'location'=>'Central Park', 'street'=>'7th Ave', 'count'=>123], ['country'=>'USA', 'state'=>'Maryland', 'city'=>'Baltimore', 'location'=>'Harber', 'count'=>24], ['country'=>'USA', 'state'=>'Michigan', 'city'=>'Lansing', 'location'=>'Midtown', 'building'=>'H2B', 'count'=>7], ['country'=>'France', 'state'=>'Sud', 'city'=>'Marseille', 'location'=>'Centre Ville', 'count'=>12], ]; $hierarchy = array(); $levels = array_reverse( array('country', 'state', 'city', 'location') ); $lastLevel = 'count'; foreach ( $locations as $L ) { $array = $L[$lastLevel]; foreach ( $levels as $level ) { $array = array($L[$level] => $array); } $hierarchy = array_merge_recursive($hierarchy, $array); } print_r($hierarchy);