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<?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);
Output for git.master, git.master_jit, rfc.property-hooks
array(2) { [0]=> array(3) { [0]=> string(6) "item-a" [1]=> string(6) "item-b" [2]=> string(6) "item-c" } [1]=> array(1) { [0]=> string(6) "item-d" } }

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