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<?php $lookup = array_flip(['Jan', 'Feb', 'Mar', 'Apr', 'May', 'Jun', 'Jul', 'Aug', 'Sep', 'Oct', 'Nov', 'Dec']); $months = ['Jan', 'Feb', 'Mar', 'Apr', 'May', 'Jun', 'Sep', 'Oct', 'Dec', 'Jan', 'Feb']; $result = []; foreach ($months as $month) { if (isset($ref) && $lookup[$month] === ($lookup[$last] + 1) % 12) { $ref = strtok($ref, "-") . "-$month"; } else { unset($ref); $ref = $month; $result[] = &$ref; } $last = $month; } var_export($result);
Output for git.master, git.master_jit, rfc.property-hooks
array ( 0 => 'Jan-Jun', 1 => 'Sep-Oct', 2 => 'Dec-Feb', )

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