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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 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.34, 8.2.0 - 8.2.30, 8.3.0 - 8.3.4, 8.3.6 - 8.3.30, 8.4.1 - 8.4.18, 8.5.0 - 8.5.3
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" } }
Output for 8.3.5
Warning: PHP Startup: Unable to load dynamic library 'sodium.so' (tried: /usr/lib/php/8.3.5/modules/sodium.so (libsodium.so.23: cannot open shared object file: No such file or directory), /usr/lib/php/8.3.5/modules/sodium.so.so (/usr/lib/php/8.3.5/modules/sodium.so.so: cannot open shared object file: No such file or directory)) in Unknown on line 0 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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