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<?php $arr1 = ['o' => 'vote', 'u' => 'true']; $arr2 = ['p' => '', 'v' => 'digit']; $merged = array_merge($arr1, $arr2); rsort($merged); echo '<pre>'; print_r($merged); ?>

preferences:
75.2 ms | 1984 KiB | 5 Q