<?php $input = [ 'item-a' => 1, 'item-b' => 2, 'item-c' => 3, 'item-d' => 5, ]; $output = []; $c = 0; $prev = null; foreach($input as $name => $dist) { if($prev && $dist-$prev > 1) { ++$c; } $output[$c][] = $name; $prev = $dist; } var_dump($output);
You have javascript disabled. You will not be able to edit any code.