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<?php $months = [ '2023-04', '2023-03', '2023-04', '2023-04', '2023-02', ]; $amounts = [ 833, 223, 829, 220, 498 ]; $sums = []; foreach($months as $i => $month) { if (!isset($sums[$month])) { $sums[$month] = 0; } $sums[$month] += $amounts[$i]; } var_dump($sums);
Output for git.master, git.master_jit, rfc.property-hooks
array(3) { ["2023-04"]=> int(1882) ["2023-03"]=> int(223) ["2023-02"]=> int(498) }

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