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<?php function hyphenatedRanges($numbers): string { $result = []; foreach ($numbers as $i => $number) { if (isset($ref) && $number === $numbers[$i - 1] + 1) { $ref = strtok($ref, "-") . "-$number"; } else { unset($ref); $ref = $number; $result[] = &$ref; } } return implode(',', $result); } echo hyphenatedRanges([1, 2, 3, 6, 8, 9]) . "\n"; // "1-3,6,8-9" echo hyphenatedRanges([2, 4, 5, 6, 8, 10]); // "2,4-6,8,10"
Output for git.master, git.master_jit, rfc.property-hooks
1-3,6,8-9 2,4-6,8,10

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