Online PHP editor | output for EeU1P

<?php $two_dimention = [ ["id" => 4, "name" => "Home", "parent" => 0, "depth" => 0], ["id" => 5, "name" => "Menu 1", "parent" => 0, "depth" => 0], ["id" => 6, "name" => "Menu 2", "parent" => 0, "depth" => 0], ["id" => 8, "name" => "Menu 2.1", "parent" => 6, "depth" => 1], ["id" => 10, "name" => "Menu 2.1.1", "parent" => 8, "depth" => 2], ["id" => 11, "name" => "Menu 2.1.2", "parent" => 8, "depth" => 2], ["id" => 9, "name" => "Menu 2.2", "parent" => 6, "depth" => 1], ["id" => 7, "name" => "Menu 3", "parent" => 0, "depth" => 0], ["id" => 18, "name" => "Menu 3.1", "parent" => 7, "depth" => 1], ]; function makeRecursive($d, $r = 0, $pk = 'parent', $k = 'id', $c = 'children') { $m = []; foreach ($d as $e) { isset($m[$e[$pk]]) ?: $m[$e[$pk]] = []; isset($m[$e[$k]]) ?: $m[$e[$k]] = []; $m[$e[$pk]][] = array_merge($e, [$c => &$m[$e[$k]]]); } return $m[$r]; // remove [0] if there could be more than one root nodes } function nested2ul($data) { $result = []; if (sizeof($data) > 0) { $result[] = '<ul>'; foreach ($data as $entry) { $result[] = sprintf( '<li>%s %s</li>', $entry['name'], nested2ul($entry['children']) ); } $result[] = '</ul>'; } return implode($result); } $temp= makeRecursive($two_dimention); echo nested2ul($temp);