<?php $a1 = [ "a" => 2, "b" => 0, "c" => 5, ]; $a2 = [ "a" => 3, "b" => 9, "c" => 7, "d" => 10, ]; var_export( array_reduce( array_keys($a2), fn($result, $k) => array_merge($result, [$k => ($result[$k] ?? 0) + $a2[$k]]), $a1 ) );
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Value for `_results` contains invalid data `array`