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<?php $months = range(1, 12); $months = array_map(function ($element) { return str_pad($element, 2, 0, STR_PAD_LEFT); }, $months); var_dump($months); $months = array_combine($months, $months); var_dump($months);
Output for git.master, git.master_jit, rfc.property-hooks
array(12) { [0]=> string(2) "01" [1]=> string(2) "02" [2]=> string(2) "03" [3]=> string(2) "04" [4]=> string(2) "05" [5]=> string(2) "06" [6]=> string(2) "07" [7]=> string(2) "08" [8]=> string(2) "09" [9]=> string(2) "10" [10]=> string(2) "11" [11]=> string(2) "12" } array(12) { ["01"]=> string(2) "01" ["02"]=> string(2) "02" ["03"]=> string(2) "03" ["04"]=> string(2) "04" ["05"]=> string(2) "05" ["06"]=> string(2) "06" ["07"]=> string(2) "07" ["08"]=> string(2) "08" ["09"]=> string(2) "09" [10]=> string(2) "10" [11]=> string(2) "11" [12]=> string(2) "12" }

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