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<?php $base = ['one' => 10]; $arr1 = ['one' => 1, 'two' => 2]; $arr2 = ['three' => 3]; var_dump(array_merge($arr1, $arr2, $base)); var_dump(array_diff_assoc(array_merge($arr1, $arr2)), $base);

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28.32 ms | 402 KiB | 5 Q