<?php $a1 = [ "a" => 2, "b" => 0, "c" => 5, ]; $a2 = [ "a" => 3, "b" => 9, "c" => 7, "d" => 10, ]; var_export( array_reduce( array_keys($a2), function ($result, $k) use ($a2) { $result[$k] = ($result[$k] ?? 0) + $a2[$k]; return $result; }, $a1 ) );
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