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<?php $first = ['01-1970' => 0.00, '03-2019' => 4350.00, '05-2019' => 150.00, '06-2019' => 50.00]; $second = ['03-2019' => 0.00, '04-2019' => 0.00, '06-2019' => 34.83]; $result = []; foreach ([$first, $second] as $a) { foreach ($a as $k=>$v) { if (!isset($result[$k])) $result[$k] = 0; $result[$k] += $v; } } print_r($result);
Output for git.master, git.master_jit, rfc.property-hooks
Array ( [01-1970] => 0 [03-2019] => 4350 [05-2019] => 150 [06-2019] => 84.83 [04-2019] => 0 )

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