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<?php $a = [10, 2, 5, 10, 0]; $b = [1, 20, 11, 8, 3]; var_export( array_reduce( array_keys($b), fn ($result, $k) => array_replace($result, [$k => ($result[$k] ?? 0) + $b[$k]]), $a ) );
Output for git.master, git.master_jit, rfc.property-hooks
array ( 0 => 11, 1 => 22, 2 => 16, 3 => 18, 4 => 3, )

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