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<?php $a = ['a'=> 'b', 'c'=> 'd'];$b = ['a'=> 'x', 'c'=> 'y', 'b'=> 'z'];$c = $a + $b;var_dump($c);$d = array_merge($a, $b);var_dump($d);

preferences:
34.72 ms | 402 KiB | 5 Q